科学计算器程序Java代码
java科学计算器源代码
import java.awt.*;import javax.swing.*;import java.awt.event.*;class Counter extends WindowAdapter{static JFrame f=new JFrame("计算器"); static JTextField text1=new JTextField("0."); static String source="";static String cal="";static String object="";static boolean flag=false;static boolean flag1=true;static boolean flag2=false;public void init(){try{Container c=f.getContentPane();JPanel pan1=new JPanel();JButton b1=new JButton("1");JButton b2=new JButton("2");JButton b3=new JButton("3");JButton b4=new JButton("4");JButton b5=new JButton("5");JButton b6=new JButton("6");JButton b7=new JButton("7");JButton b8=new JButton("8");JButton b9=new JButton("9");JButton b0=new JButton("0");JButton b11=new JButton("+");JButton b12=new JButton("-");JButton b13=new JButton("*");JButton b14=new JButton("/");JButton b15=new JButton(".");JButton b16=new JButton("=");JButton bclar=new JButton("清零");text1.setHorizontalAlignment(JTextField.RIGHT);c.add(text1,"North");c.add(pan1);A aa=new A();Result re=new Result();Opertion op=new Opertion();Clar cl=new Clar();b1.addActionListener(aa);b2.addActionListener(aa);b3.addActionListener(aa);b4.addActionListener(aa);b5.addActionListener(aa);b6.addActionListener(aa);b7.addActionListener(aa);b8.addActionListener(aa);b9.addActionListener(aa);b0.addActionListener(aa);b11.addActionListener(op);b12.addActionListener(op);b13.addActionListener(op);b14.addActionListener(op);b16.addActionListener(re);b15.addActionListener(aa);bclar.addActionListener(cl);pan1.add(b1);pan1.add(b2);pan1.add(b3);pan1.add(b11);pan1.add(b4);pan1.add(b5);pan1.add(b6);pan1.add(b12);pan1.add(b7);pan1.add(b8);pan1.add(b9);pan1.add(b13);pan1.add(b0);pan1.add(b15);pan1.add(b16);pan1.add(b14);pan1.add(bclar);f.setSize(200,220);f.setVisible(true);}catch(Exception e){System.out.println(e.getMessage());}}class A implements ActionListener{public void actionPerformed(ActionEvent e) {String a=text1.getText();String s=e.getActionCommand();if(a.equals("0.")||a.equals("+")||a.equals("-")||a.equals("*")||a.equals("/")) text1.setText(s);else {if(flag2){text1.setText(s);flag2=false;}elsetext1.setText(a+s);}}}class Opertion implements ActionListener{public void actionPerformed(ActionEvent e){cal=e.getActionCommand();if(flag1==true)source=text1.getText();text1.setText(cal);flag1=false;flag=true;}}class Result implements ActionListener{public void actionPerformed(ActionEvent e){double num1;num1=Double.parseDouble(source); object=text1.getText();double num2;num2=Double.parseDouble(object); double result=0;if(cal.equals("+"))result=num1+num2;if(cal.equals("-"))result=num1-num2;if(cal.equals("*"))result=num1*num2;if(cal.equals("/"))if(num2==0)text1.setText("除数不能为0");elseresult=num1/num2;String s1=Double.toString(result);text1.setText(s1);flag1=true;flag2=true;}}class Clar implements ActionListener{public void actionPerformed(ActionEvent e) {text1.setText("0.");}}public static void main(String[] args){Counter count=new Counter();count.init();}public void windowClosing(WindowEvent e){ System.exit(1);}public void windowOpened(WindowEvent e){} public void windowIconified(WindowEvent e){} public void windowDeiconified(WindowEvent e){} public void windowClosed(WindowEvent e){} public void windowActivated(WindowEvent e){} public void windowDeactivated(WindowEvent e){} }。
计算器完整代码(java)
1． Calculator 类import java.applet.*;import java.awt.*;import java.awt.event.*;import ng.*;import java.applet.Applet;import javax.swing.*;import javax.swing.border.*;public class Calculator extends JApplet implements ActionListener {private final String[] KEYS={"7","8","9","/","sqrt", "4","5","6","*","%","1","2","3","-","1/x","0","+/-",".","+","="};private final String[] COMMAND={"Backspace","CE","C"};private final String[] M={" ","MC","MR","MS","M+"};private JButton keys[]=new JButton[KEYS.length];private JButton commands[]=new JButton[COMMAND.length];private JButton m[]=new JButton[M.length];private JTextField display =new JTextField("0");// public JTextField setHorizontalAlignment(int alignment);// private JTextFielddisplay.setHorizontalAlignment(JTextField.RIGHT)=new JTextField("0"); private void setup(){display.setHorizontalAlignment(JTextField.RIGHT);JPanel calckeys=new JPanel();JPanel command=new JPanel();JPanel calms=new JPanel();calckeys.setLayout(new GridLayout(4,5,3,3));command.setLayout(new GridLayout(1,3,3,3));calms.setLayout(new GridLayout(5,1,3,3));for(int i=0;i<KEYS.length;i++){keys[i]=new JButton(KEYS[i]);calckeys.add(keys[i]);keys[i].setForeground(Color.blue);}keys[3].setForeground(Color.red);keys[4].setForeground(Color.red);keys[8].setForeground(Color.red);keys[9].setForeground(Color.red);keys[13].setForeground(Color.red);keys[14].setForeground(Color.red);keys[18].setForeground(Color.red);keys[19].setForeground(Color.red);for(int i=0;i<COMMAND.length;i++){commands[i]=new JButton(COMMAND[i]);command.add(commands[i]);commands[i].setForeground(Color.red);}for(int i=0;i<M.length;i++){m[i]=new JButton(M[i]);calms.add(m[i]);m[i].setForeground(Color.red);}JPanel panel1=new JPanel();panel1.setLayout(new BorderLayout(3,3));panel1.add("North",command);panel1.add("Center",calckeys);JPanel top=new JPanel();top.setLayout(new BorderLayout());display.setBackground(Color.WHITE);top.add("Center",display);getContentPane().setLayout(new BorderLayout(3,5)); getContentPane().add("North",top);getContentPane().add("Center",panel1); getContentPane().add("West",calms);}public void init(){setup();for(int i=0;i<KEYS.length;i++){keys[i].addActionListener(this);}for(int i=0;i<COMMAND.length;i++){commands[i].addActionListener(this);}for(int i=0;i<M.length;i++){m[i].addActionListener(this);}display.setEditable(false);}public void actionPerformed(ActionEvent e){String label=e.getActionCommand();// double zero=e.getActionCommand();if(label=="C")handleC();else if(label=="Backspace")handleBackspace();else if(label=="CE")display.setText("0");else if (label=="1/x")daoShu();else if(label=="sqrt"){display.setText(Math.sqrt(getNumberFromDisplay())+"");}else if("0123456789.".indexOf(label)>=0){handleNumber(label);// handlezero(zero);}elsehandleOperator(label);}private boolean firstDigit=true;private void handleNumber(String key){if(firstDigit){ if(key.equals("0"))display.setText(key);else if(key.equals(".")){display.setText("0.");firstDigit=false;}else if(!key.equals("0")&&!key.equals(".")){display.setText(key);firstDigit=false;}}else if((key.equals("."))&&(display.getText().indexOf(".")<0)) display.setText(display.getText()+".");else if(!key.equals(".")&&display.getText().length()<=32) display.setText(display.getText()+key);}private double number=0;private String operator="=";private void handleOperator(String key){if(operator.equals("/")){if(getNumberFromDisplay()==0){display.setText("除数不能为零");}else{number/=getNumberFromDisplay();}long t1;double t2;t1=(long)number;t2=number-t1;if(t2==0){display.setText(String.valueOf(t1));}else{display.setText(String.valueOf(number));}}else if(operator.equals("+"))number+=getNumberFromDisplay();else if(operator.equals("-"))number-=getNumberFromDisplay();else if(operator.equals("*"))number*=getNumberFromDisplay();else if(operator.equals("%"))number=number/100;else if(operator.equals("+/-"))number=number*(-1);else if(operator.equals("="))number=getNumberFromDisplay();long t1;double t2;t1=(long)number;t2=number-t1;if(t2==0)display.setText(String.valueOf(t1));elsedisplay.setText(String.valueOf(number));operator=key;firstDigit=true;}private double getNumberFromDisplay(){return Double.valueOf(display.getText()).doubleValue(); }private void handleC(){display.setText("0");firstDigit=true;operator="=";}private void handleBackspace(){String text=display.getText();int i=text.length();if(i>0){text=text.substring(0,i-1);if(text.length()==0){display.setText("0");firstDigit=true;operator="=";}elsedisplay.setText(text);}}private void daoShu(){if (display.getText().equals("0")){display.setText("除数不能为零");System.out.println(1);}else{long l;double d=1/getNumberFromDisplay();l=(long)d;System.out.println(d);System.out.println(l);display.setText(String.valueOf(d));}}}2.CalFrame 类import java.awt.Color;importimport java.awt.event.ActionListener;import java.awt.event.WindowAdapter;import java.awt.event.WindowEvent;import javax.swing.JApplet;import javax.swing.JFrame;public class Test {public static void main(String[] args) {JFrame f=new JFrame();f.getAccessibleContext();Calculator Calculator1=new Calculator(); Calculator1.init();f.getContentPane().add("Center",Calculator1);f.setVisible(true);f.setBounds(300, 200,380,245);f.setBackground(Color.LIGHT_GRAY);f.validate();f.setResizable(false);f.addWindowListener(new WindowAdapter(){public void windowClosing(WindowEvent e){System.exit(0);}});f.setTitle("计算器");}}。
JAVA科学计算器
JAVA科学计算器Java是一种广泛应用于科学计算和数据分析领域的编程语言，拥有强大的数学计算库和丰富的科学计算函数，因此非常适合用于开发科学计算器。
本文将介绍如何使用Java开发一个功能强大的科学计算器。
一、需求分析1.支持基本的四则运算（加、减、乘、除）2.支持高级的数学函数（三角函数、指数函数、对数函数等）3.支持科学计数法（输入和显示均支持科学计数法）4.支持清空功能，删除单个字符功能5.支持键盘输入和界面按钮输入两种方式输入计算表达式二、界面设计1. 界面采用图形用户界面（GUI）设计，使用Swing或JavaFX等界面库进行开发2.使用文本框显示计算结果和表达式3.使用按钮实现数字和运算符的输入4.添加清空按钮和删除按钮5.添加科学计数法开关按钮三、代码实现1. 创建一个继承自JFrame的主窗口类，设置窗口标题、大小和关闭方式```public class ScientificCalculator extends JFrameprivate JTextField outputField;//其他界面组件声明public ScientificCalculatosuper("科学计算器");setSize(400, 600);setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);//初始化界面组件并添加到窗口//...setVisible(true);}```2. 创建一个继承自JPanel的面板类，用于放置计算器的按钮和文本框```public class CalculatorPanel extends JPanelprivate JTextField outputField;//其他按钮和变量声明public CalculatorPanesetLayout(new BorderLayout();//初始化界面组件并添加到面板//...}```3.在面板类中添加按钮事件监听器，实现按钮的点击响应```public class CalculatorPanel extends JPanel implements ActionListenerprivate JTextField outputField;private JButton[] numberButtons;private JButton[] operatorButtons;//其他按钮和变量声明public CalculatorPanesetLayout(new BorderLayout();//初始化界面组件并添加到面板//...//添加按钮事件监听器for (JButton button : numberButtons)button.addActionListener(this);}for (JButton button : operatorButtons)button.addActionListener(this);}//其他按钮添加监听器//设置文本框只读outputField.setEditable(false);}public void actionPerformed(ActionEvent e)//根据按钮的命令执行相应的操作//...}```4.在按钮事件监听器中实现计算逻辑，调用数学库中的函数完成计算```public void actionPerformed(ActionEvent e)//清空操作outputField.setText("");//删除操作String currentText = outputField.getText(;outputField.setText(currentText.substring(0,currentText.length( - 1));} else//数字或运算符输入}```5.在启动类中创建主窗口对象，并将面板对象添加到主窗口中```public class Mainpublic static void main(String[] args)SwingUtilities.invokeLater(( ->ScientificCalculator calculator = new ScientificCalculator(;calculator.add(new CalculatorPanel();});}```四、测试与优化在开发完成后，需要对科学计算器进行测试，保证其功能正常，并进行优化，确保使用体验良好，例如添加键盘监听器，支持键盘输入，修复可能出现的Bug等。
Java计算器源代码(已成功运行)汇总
以下为代码：
importjavax.swing.*;
importjava.awt.*;
importjava.awt.event.*;
public class Calculator extends JFrame implements ActionListener
{
private booleandotExist, operated, equaled; //帮助运算的布尔变量
private double storedNumber; //目前的结果private char lastOperator; //表示上一运算符private JTextField operation; //结果栏
private JButton dot, plus, minus, multi, div, sqrt, equal, changePN, clear; //运算符
private JButton[] numbers; //数字
//构造者
public Calculator(
{
setTitle("Calculator";
//初始化变量
dotExist = false; //表示当前的数是否有小数点
operated = false; //表示任意运算符是否被按下equaled = false; //表示等号是否被按下storedNumber = 0;
else if (lastOperator == 's' storedNumber = Math.sqrt(currentNumber; else if (lastOperator == '=' && equaled storedNumber = currentNumber; operation.setText("" + storedNumber; operated = true; lastOperator = operator; } //快捷使用GridBagLayout的方法private void addComponent(GridBagLayout layout, Component component, int row, int col, int width, int height { GridBagConstraints constraints=new GridBagConstraints(; constraints.fill = GridBagConstraints.BOTH; constraints.insets = new Insets(10, 2, 10, 2; constraints.weightx = 100; constraints.weighty = 100; constraints.gridx = col; constraints.gridy = row; constraints.gridwidth = width; constraints.gridheight = height; layout.setConstraints(component, constraints;
java科学计算器（进制转换）
java科学计算器（进制转换）JAVA综合程序设计与分析一、题目：用java语言编写科学计算器，要求完成加、减、乘、除以及基本函数处理还有数的进制转换。
二、摘要：本计算器可以进行简单的四则运算（加、减、乘、除）但仅限于十进制下，还可以进行（二进制，八进制，十进制）之间的相互转换，还有基本三角函数和平方根，对数等基本数学函数运算三、功能说明：A．运用两个面板的叠加做出界面。
B．通过在按钮的单击事件处理方法中调用类的成员方法calculate （）来进行简易计算器的各种运算，并正确实现运算功能。
C．调用Math包中的方法实现各函数功能。
D．添加菜单条，列出‘选项’、‘进制转换’、‘帮助’等菜单选项，并分别实现‘选项’中‘退出’的功能，通过调用Integer包中的方法实现二进制、八进制的转换，‘帮助'菜单栏中‘用法’的提示对话框。
E．整个程序对话框可实现最小化、最大化、关闭。
四、详细设计package计算器;import java.awt.*;import java.awt.event.*;import javax.swing.*;public class Calculator extends Frame implements ActionListener, WindowListener{privateprivateprivate GridBagConstraints constraints;private JTextField displayField; //计算结果显示区private String lastCommand; //保存+,-,*,/,=命令0private double result; //保存计算结果private boolean start; //判断是否为数字的开始private JMenuBar menubar;private JMenuItem m_exit,m2_ejz,m2_bjz;private Dialog dialog;private Label label_dialog;private JButtonbutton_sqrt,button_plusminus,button_CE,button_cancel,butt on_1,button_ 2,button_3,button_4,button_5,button_6,button_7,button_8,but ton_9,button _0,button_plus,button_minus,button_multiply,button_divide,bu tton_point,button_equal,button_log,button_tan,button_cos,button_sin,butt on_exp;public Calculator() //构造方法设置布局、为按钮注册事件监听器{super("Calculator");this.setLocation(240,200);this.setSize(350,300);this.setResizable(true);this.setLayout(new GridLayout(7,1));this.addmyMenu(); //调用成员方法添加菜单displayField=new JTextField(30);this.add(displayField);displayField.setEditable(true);start=true;result=0;lastCommand = "=";JPanel panel0=new JPanel();panel0.setLayout(new GridLayout(1,4,4,4)); JPanel panel1=new JPanel();panel1.setLayout(new GridLayout(1,5,4,4)); this.add(panel1);button_sqrt=new JButton("sqrt");button_plusminus=new JButton("+/-"); button_exp=new JButton("exp");button_CE=new JButton("退格");button_cancel=new JButton("C"); JPanel panel2=new JPanel();panel2.setLayout(new GridLayout(1,5,4,4)); this.add(panel2);button_7=new JButton("7");button_8=new JButton("8");button_9=new JButton("9");button_log=new JButton("log");button_divide=new JButton("/");JPanel panel3=new JPanel();panel3.setLayout(new GridLayout(1,5,4,4)); this.add(panel3);button_4=new JButton("4");button_5=new JButton("5");button_6=new JButton("6");button_tan=new JButton("tan");button_multiply=new JButton("*");JPanel panel4=new JPanel();panel4.setLayout(new GridLayout(1,5,4,4)); this.add(panel4);button_1=new JButton("1");button_2=new JButton("2");button_3=new JButton("3");button_cos=new JButton("cos");button_minus=new JButton("-");JPanel panel5=new JPanel();panel5.setLayout(new GridLayout(1,5,4,4)); this.add(panel5);button_0=new JButton("0");button_point=new JButton(".");button_equal=new JButton("=");button_sin=new JButton("sin");button_plus=new JButton("+");panel1.add(button_sqrt);panel1.add(button_plusminus);panel1.add(button_exp);panel1.add(button_CE);panel1.add(button_cancel);panel2.add(button_7);panel2.add(button_8);panel2.add(button_9);panel2.add(button_log);panel2.add(button_divide);panel3.add(button_4);panel3.add(button_5);panel3.add(button_6);panel3.add(button_tan);panel3.add(button_multiply);panel4.add(button_1);panel4.add(button_2);panel4.add(button_3);panel4.add(button_cos);panel4.add(button_minus);panel5.add(button_0);panel5.add(button_point);panel5.add(button_equal);panel5.add(button_sin);panel5.add(button_plus);button_sqrt.addActionListener(this); button_plusminus.addActionListener(this); button_exp.addActionListener(this); button_CE.addActionListener(this); button_cancel.addActionListener(this); button_7.addActionListener(this);button_8.addActionListener(this);button_9.addActionListener(this);button_log.addActionListener(this); button_divide.addActionListener(this); button_4.addActionListener(this);button_5.addActionListener(this);button_6.addActionListener(this);button_tan.addActionListener(this); button_multiply.addActionListener(this); button_1.addActionListener(this);button_2.addActionListener(this);button_3.addActionListener(this);button_cos.addActionListener(this);button_minus.addActionListener(this);button_0.addActionListener(this);button_point.addActionListener(this);button_equal.addActionListener(this);button_sin.addActionListener(this);button_plus.addActionListener(this);this.addWindowListener(new WinClose()); //注册窗口监听器this.setVisible(true);}private void addmyMenu() //菜单的添加{JMenuBar menubar=new JMenuBar();this.add(menubar);JMenu m1=new JMenu("选项");JMenu m2=new JMenu("进制转换");JMenuItem m1_exit=new JMenuItem("退出");m1_exit.addActionListener(this);JMenuItem m2_ejz=new JMenuItem("二进制");m2_ejz.addActionListener(this);JMenuItem m2_bjz=new JMenuItem("八进制");m2_bjz.addActionListener(this);JMenu m3 = new JMenu(" 帮助");JMenuItem m3_Help = new JMenuItem("用法");m3_Help.addActionListener(this);dialog = new Dialog(this,"提示",true); //模式窗口dialog.setSize(240,80);label_dialog = new Label("",Label.CENTER); //标签的字符串为空，居中对齐dialog.add(label_dialog);dialog.addWindowListener(this); //为对话框注册窗口事件监听器m1.add(m1_exit);menubar.add(m1);m2.add(m2_ejz);m2.add(m2_bjz);menubar.add(m2);m3.add(m3_Help);menubar.add(m3); }public void actionPerformed(ActionEvent e) //按钮的单击事件处理方法{if(e.getSource().equals(button_1)||e.getSource().equals(butto n_2) ||e.getSource().equals(button_3)||e.getSource().equals(button _4)||e.getSource().equals(button_5)||e.getSource().equals(button_6)||e.getSource().equals(button_7)||e.getSource().equals(button_8)||e.getSource().equals(button_9)||e.getSource().equals(button_0)||e.getSource().equals(button_point)||e.getSource().equals(but ton_plusm inus)||e.getSource().equals(button_cancel)||e.getSource().equals(b utton_CE)) { //非运算符的处理方法String input=e.getActionCommand();if (start){displayField.setText("");start=false;if(input.equals("+/-"))displayField.setText(displayField.getT ext()+"-");}if(!input.equals("+/-")){String str=displayField.getText();if(input.equals("退格")) //退格键的实现方法{if(str.length()>0)displayField.setText(str.substring(0,str.length()-1));}else if(input.equals("C")) //清零键的实现方法{displayField.setText("0");start=true;}elsedisplayField.setText(displayField.getT ext()+input);}}else if (e.getActionCommand()=="二进制") //二进制的转换{int n=Integer.parseInt(displayField.getText()); displayField.setText(Integer.toBinaryString(n));}else if (e.getActionCommand()=="八进制") //八进制的转换{int n=Integer.parseInt(displayField.getText()); displayField.setText(Integer.toOctalString(n));}else if (e.getActionCommand()=="退出") //选项中退出的处理方法{System.exit(0);}else if(e.getActionCommand()=="用法") //按下'帮助'菜单栏中用法的处理方法{label_dialog.setT ext("sqrt,exp等键是先输运算符再输数字\");dialog.setLocation(400,250);dialog.setVisible(true);}else//各运算符的识别{String command=e.getActionCommand();if(start){lastCommand=command;}else{calculate(Double.parseDouble(displayField.getText()));lastCommand=command;start=true;}}}public void calculate(double x) //各运算符的具体运算方法{double d=0;if (lastCommand.equals("+")) result+= x;else if (lastCommand.equals("-")) result-=x;else if (lastCommand.equals("*")) result*=x;else if (lastCommand.equals("/")) result/=x;else if (lastCommand.equals("=")) result=x;else if (lastCommand.equals("sqrt")) {d=Math.sqrt(x);result=d;}else if (lastCommand.equals("exp")) {d=Math.exp(x);result=d;}else if (lastCommand.equals("log")) {d=Math.log(x);result=d;}else if (lastCommand.equals("tan")) {d=Math.tan(x);result=d;}else if (lastCommand.equals("cos")){d=Math.cos(x);result=d;}else if (lastCommand.equals("sin")){d=Math.sin(x);result=d;}displayField.setText(""+ result);}public void windowClosing(WindowEvent e){if(e.getSource()==dialog)dialog.setVisible(false); //隐藏对话框elseSystem.exit(0);}public void windowOpened(WindowEvent e) { } public void windowActivated(WindowEvent e) { } public void windowDeactivated(WindowEvent e) { } public void windowClosed(WindowEvent e) { } public void windowIconified(WindowEvent e) { } public void windowDeiconified(WindowEvent e) { } public static void main(String args[]){Calculator calculator=new Calculator();}}class WinClose implements WindowListener{public void windowClosing(WindowEvent e) //单击窗口关闭按钮时触发并执行实现窗口监听器接口中的方法{System.exit(0); //结束程序运行}public void windowOpened(WindowEvent e){}public void windowActivated(WindowEvent e){}public void windowDeactivated(WindowEvent e){}public void windowClosed(WindowEvent e){}public void windowIconified(WindowEvent e){}public void windowDeiconified(WindowEvent e){}}五、程序运行结果1.界面2.基本运算，如54 -12 =42：3.数学函数运算，如9的开平方为3：六、总结与体会总结：（1）通过编写这个相对复杂的程序，让我认识解决实际问题前应现建立模型，再通过建立的模型使问题简单化，从而解决问题。
计算器 java代码
import javax.swing.*;import java.awt.*;import java.awt.event.*;public class Calculater extends JFrame implements ActionListener{private JPanel north, center;private JButton[] buttons = new JButton[20];private JTextField text;private double result;private char modifier = '\0';private boolean flag = false;private int door=0;public Calculater( ){super("计算器");Container c = getContentPane( );c.setLayout(new BorderLayout( ));text = new JTextField(25);north = new JPanel( );north.add(text);center = new JPanel( );center.setLayout(new GridLayout(5,4,2,2));String s[] = {"sqrt","+/-","ON","OFF","7","8","9","/","4","5","6","*","1","2","3","-","0","." ,"=","+"};for(int i=0;i<20;i++){buttons[i] = new JButton(s[i]);center.add(buttons[i]);}for(int i=0;i<20;i++){buttons[i].addActionListener(this);}c.add(north,"North");c.add(center,"Center");}public void setFontAndColor( ){Font f = new Font("宋体",Font.BOLD,20);text.setFont(f);for(int i=0;i<20;i++){buttons[i].setFont(f);buttons[i].setForeground(Color.RED);}}public void actionPerformed(ActionEvent e){String str = e.getActionCommand( );if(("0123456789.".indexOf(str)!=-1)&&door==1){if(flag){text.setText("");flag = false;}text.setText(text.getText()+str);}else if(("+-*/".indexOf(str)!=-1)&&door==1){modifier = str.charAt(0);double num = Double.valueOf(text.getText( ));result = num;text.setText(text.getText( )+str);flag = true;}else if("ON".indexOf(str)!=-1){if(door==0) door=1;text.setText("");}else if("OFF".indexOf(str)!=-1){ if(door==1) door=0;text.setText(" ");}else if(("sqrt".indexOf(str)!=-1)&&door==1){double num=Double.valueOf(text.getText());result=Math.sqrt(num);}else if(("+/-".indexOf(str)!=-1)&&door==1){double num=Double.valueOf(text.getText());result=num*(-1);text.setText(""+result);}else if((str.charAt(0)=='=')&&door==1){if(modifier=='+'){double num = Double.valueOf(text.getText( ));result += num;}if(modifier=='-'){double num = Double.valueOf(text.getText( ));result -= num;}if(modifier=='*'){double num = Double.valueOf(text.getText( ));result *= num;}if(modifier=='/'){double num = Double.valueOf(text.getText( ));result /= num;}text.setText(result+"");modifier = '\0';result = 0;}}public static void main(String[] args){Calculater app = new Calculater( );app.setFontAndColor( );app.setSize(480,320);app.setDefaultCloseOperation(EXIT_ON_CLOSE);app.setVisible(true);}}。
简单的java代码例子
简单的java代码例子1. 使用Java实现一个简单的计算器，可以进行加减乘除运算。
```javaimport java.util.Scanner;public class Calculator {public static void main(String[] args) {Scanner scanner = new Scanner(System.in);System.out.print("请输入第一个数：");double num1 = scanner.nextDouble();System.out.print("请输入运算符（+、-、*、/）：");String operator = scanner.next();System.out.print("请输入第二个数：");double num2 = scanner.nextDouble();double result = 0;switch (operator) {case "+":result = num1 + num2;break;case "-":result = num1 - num2;break;case "*":result = num1 * num2;break;case "/":result = num1 / num2;break;default:System.out.println("输入的运算符不正确！");break;}System.out.println("计算结果为：" + result);}}```2. 使用Java实现一个简单的猜数字游戏，随机生成一个1-100之间的整数，让用户猜，直到猜中为止。
```javaimport java.util.Random;import java.util.Scanner;public class GuessNumber {public static void main(String[] args) {Random random = new Random();int number = random.nextInt(100) + 1;Scanner scanner = new Scanner(System.in);int guess;do {System.out.print("请输入你猜的数字（1-100）：");guess = scanner.nextInt();if (guess > number) {System.out.println("猜大了！");} else if (guess < number) {System.out.println("猜小了！");}} while (guess != number);System.out.println("恭喜你，猜对了！");}}```3. 使用Java实现一个简单的学生信息管理系统，可以添加、删除、修改、查询学生信息。
超级简单明了的JAVA计算器代码
package caculator;import java.awt.Color;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import javax.swing.*;public class caculator extends JFrame implements ActionListener { double sum=0;static double getValue;static int action ;int i=0,j=0,p=0,l;double par1;JButton Jk=new JButton("k");JButton J1 = new JButton("1");JButton J2 = new JButton("2");JButton J3 = new JButton("3");JButton J4 = new JButton("4");JButton J5 = new JButton("5");JButton J6 = new JButton("6");JButton J7 = new JButton("7");JButton J8 = new JButton("8");JButton J9 = new JButton("9");JButton J0 = new JButton("0");JButton Je = new JButton("=");JButton Ja = new JButton("+");JButton Jr = new JButton("-");JButton Jm = new JButton("*");JButton Jd = new JButton("/");JButton Jc = new JButton("清除");JButton Jpt = new JButton(".");JTextArea show = new JTextArea("");caculator(){super("caculator");setLocation(200,200);setSize(300,350);setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setVisible(true);JPanel jp = new JPanel();jp.setLayout(null);jp.add(J1);jp.add(J2);jp.add(J3);jp.add(J4);jp.add(J5);jp.add(J6);jp.add(J7);jp.add(J8);jp.add(J9);jp.add(J0);jp.add(Je);jp.add(Ja);jp.add(Jr);jp.add(Jm);jp.add(Jd);jp.add(Jc);jp.add(Je);jp.add(Jpt);J9.setBackground(Color.pink); J8.setBackground(Color.pink); J7.setBackground(Color.pink); J6.setBackground(Color.pink); J5.setBackground(Color.pink); J4.setBackground(Color.pink); J3.setBackground(Color.pink); J2.setBackground(Color.pink); J1.setBackground(Color.pink); J0.setBackground(Color.pink);Je.setBackground(Color.pink);Ja.setBackground(Color.pink); Jr.setBackground(Color.pink); Jm.setBackground(Color.pink); Jd.setBackground(Color.pink); Jc.setBackground(Color.pink); Jpt.setBackground(Color.pink);J7.setBounds(10,70,60,50);J8.setBounds(75,70,60,50);J9.setBounds(140,70,60,50); J4.setBounds(10,125,60,50); J5.setBounds(75,125,60,50); J6.setBounds(140,125,60,50); J1.setBounds(10,180,60,50); J2.setBounds(75,180,60,50); J3.setBounds(140,180,60,50); J0.setBounds(10,235,60,50); Je.setBounds(75,235,60,50); Jpt.setBounds(140,235,60,50);Jd.setBounds(205,70,60,50); Jm.setBounds(205,125,60,50); Jr.setBounds(205,180,60,50); Ja.setBounds(205,235,60,50); Jc.setBounds(205,10,60,50);J1.addActionListener(this);J2.addActionListener(this);J3.addActionListener(this);J4.addActionListener(this);J5.addActionListener(this);J6.addActionListener(this);J7.addActionListener(this);J8.addActionListener(this);J9.addActionListener(this);J0.addActionListener(this);Ja.addActionListener(this);Jr.addActionListener(this);Jm.addActionListener(this);Je.addActionListener(this);Jc.addActionListener(this);Jpt.addActionListener(this);jp.add(show);show.setBackground(Color.pink);show.setBounds(10,10,180,50);setContentPane(jp);}@Overridepublic void actionPerformed(ActionEvent e) { if(e.getSource()==J0){show.setText("0"); }if(e.getSource()==J1){show.setText("1");}if(e.getSource()==J2){show.setText("2");}if(e.getSource()==J3){show.setText("3");}if(e.getSource()==J4){show.setText("4");}if(e.getSource()==J5){show.setText("5");}if(e.getSource()==J6){show.setText("6");}if(e.getSource()==J7){show.setText("7");}if(e.getSource()==J8){show.setText("8");}if(e.getSource()==J9){show.setText("9");}par1=Double.parseDouble(show.getText()); if(e.getSource()==Ja){show.setText("");if(j==0){sum=par1;}else if(action==1){sum+=par1;}setsum();j++;p=0;i=0;action = 1;} if(e.getSource()==Jr){show.setText("");if(j==0){sum=par1;}else if(action==2){sum-=par1;}setsum();j++;p=0;i=0;action = 2;}if(e.getSource()==Jm){show.setText(""); if(j==0){sum=par1;}else if(action==3){sum*=par1;}setsum();j++;p=0;i=0;action = 3;}if(e.getSource()==Jd){show.setText(""); if(j==0){sum=par1;}else if(action==4){sum/=par1;}setsum();j++;p=0;i=0;action = 4;if(e.getSource()==Jc){clear();}if(e.getSource()==Jpt){show.append(".");}if(e.getSource()==Je){switch(action){case 1:show.setText(String.valueOf(sum+=par1)); break;case 2:show.setText(String.valueOf(sum-=par1)); break;case 3:show.setText(String.valueOf(sum*=par1)); break;case 4:show.setText(String.valueOf(sum/=par1)); break;}i=0;j=0;action=0;}}private void setsum() {show.setText(String.valueOf(sum));String s=show.getText();}void clear(){i=0;j=0;p=0;sum=0;action=0;show.setText("0"); }// TODO Auto-generated method stubpublic static void main(String args[]){caculator ct=new caculator();}}。
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科学计算器程序Java代码MC：清除独立内存里的数字MR：读出独立内存数字MS：将显示数字保存到独立内存,并取代内存中原有数字M+：将显示数字向独立内存累加(独立内存是一个临时寄放数字的存储器,方便计算)CE：纠错键(CLEAR ERROR).输入数字有错,按它可以重新输入C：表示清零,将计算器恢复到开机状态功能举例：源程序如下：import java.awt.BorderLayout;import javax.swing.JRadioButtonMenuItem; import javax.swing.JTextField;public class Calucator extends JFrame { private JTextField tf;private JPanel panel1, panel2, panel3, panel4;private JMenuBar myBar;private JMenu menu1, menu2, menu3;private JMenuItem editItem1, editItem2, help1, help2, help3;private JRadioButtonMenuItem seeItem1, seeItem2;//单选框private JCheckBoxMenuItem seeItem3;//复选框private ButtonGroup bgb;private String back;private boolean IfResult = true, flag = false;private String oper = "=";private double result = 0;private Num numActionListener;private DecimalFormat df;public Calucator(){super("科学计算器");//设置标题栏df= new DecimalFormat("#.####");//保留四位小数this.setLayout(new BorderLayout(10, 5));panel1 = new JPanel(new GridLayout(1, 3, 10, 10));panel2 = new JPanel(new GridLayout(5, 6, 5, 5));//5行6列panel3 = new JPanel(new GridLayout(5, 1, 5, 5));panel4= new JPanel(new BorderLayout(5, 5));/***菜单栏*/myBar = new JMenuBar();menu1 = new JMenu("编辑(E)");menu2 = new JMenu("查看(V)");menu3 = new JMenu("帮助(H)");menu1.setFont(new Font("宋体", Font.PLAIN, 12));menu2.setFont(new Font("宋体", Font.PLAIN, 12));menu3.setFont(new Font("宋体", Font.PLAIN, 12));/***编辑栏*/editItem1= new JMenuItem("复制(C) Ctrl+C");editItem2= new JMenuItem("粘贴(P) Ctrl+V");editItem1.setFont(new Font("宋体",Font.PLAIN,12));editItem2.setFont(new Font("宋体",Font.PLAIN,12));/***查看栏*/seeItem1= new JRadioButtonMenuItem("科学型(T)");seeItem2= new JRadioButtonMenuItem("标准型(S)");seeItem3= new JCheckBoxMenuItem("数字分组(I)");seeItem1.setFont(new Font("宋体",Font.PLAIN,12));seeItem2.setFont(new Font("宋体",Font.PLAIN,12));seeItem3.setFont(new Font("宋体",Font.PLAIN,12));/***帮助栏*/help1 = new JMenuItem("帮助主题(H)");help2= new JMenuItem("关于计算器(A)");help1.setFont(new Font("宋体",Font.PLAIN,12));help2.setFont(new Font("宋体",Font.PLAIN,12));bgb = new ButtonGroup();//选项组menu1.add(editItem1);menu1.add(editItem2);menu2.add(seeItem1);menu2.add(seeItem2);menu2.addSeparator();//添加一条分割线menu2.add(seeItem3);menu3.add(help1);menu3.addSeparator();//添加一条分割线menu3.add(help2);myBar.add(menu1);myBar.add(menu2);myBar.add(menu3);this.setJMenuBar(myBar);numActionListener= new Num();//实现数字监听/***文本域，即为计算器的屏幕显示区域*/tf = new JTextField();tf.setEditable(false);//文本区域不可编辑tf.setBackground(Color.white);//文本区域的背景色tf.setHorizontalAlignment(JTextField.RIGH T);//文字右对齐tf.setText("0");tf.setBorder(BorderFactory.createLoweredB evelBorder());init();//对计算器进行初始化}/***初始化操作*添加按钮*/private void init(){addButton(panel1, "Backspace", newClear(), Color.red);addButton(panel1, "CE", new Clear(), Color.red);addButton(panel1, "C", new Clear(), Color.red);addButton(panel2, "1/x", new Signs(), Color.magenta);addButton(panel2, "log", new Signs(), Color.magenta);addButton(panel2, "7", numActionListener, Color.blue);addButton(panel2, "8", numActionListener, Color.blue);addButton(panel2, "9", numActionListener, Color.blue);addButton(panel2, "÷", new Signs(), Color.red);addButton(panel2, "n!", new Signs(), Color.magenta);addButton(panel2, "sqrt", new Signs(), Color.magenta);addButton(panel2, "4", numActionListener, Color.blue);addButton(panel2, "5", numActionListener, Color.blue);addButton(panel2, "6", numActionListener, Color.blue);addButton(panel2, "×", new Signs(), Color.red);addButton(panel2, "sin", new Signs(), Color.magenta);addButton(panel2, "x^2", new Signs(), Color.magenta);addButton(panel2, "1", numActionListener, Color.blue);addButton(panel2, "2", numActionListener, Color.blue);addButton(panel2, "3", numActionListener, Color.blue);addButton(panel2, "-", new Signs(), Color.red);addButton(panel2, "cos", new Signs(), Color.magenta);addButton(panel2, "x^3", new Signs(), Color.magenta);addButton(panel2, "0", numActionListener, Color.blue);addButton(panel2, "-/+", new Clear(), Color.blue);addButton(panel2, ".", new Dot(), Color.blue);addButton(panel2, "+", new Signs(), Color.red);addButton(panel2, "tan", new Signs(), Color.magenta);addButton(panel2, "%", new Signs(), Color.magenta);addButton(panel2, "π", numActionListener, Color.orange);addButton(panel2, "e", numActionListener, Color.orange);addButton(panel2, "′″", new Signs(), Color.orange);addButton(panel2, "=", new Signs(), Color.red);JButton btns = new JButton("计算器");btns.setBorder(BorderFactory.createLowere dBevelBorder());btns.setEnabled(false);//按钮不可操作btns.setPreferredSize(new Dimension(20, 20));panel3.add(btns);//加入按钮addButton(panel3, "MC", null, Color.red);addButton(panel3, "MR", null, Color.red);addButton(panel3, "MS", null, Color.red);addButton(panel3, "M+", null, Color.red);panel4.add(panel1,BorderLayout.NORTH);panel4.add(panel2,BorderLayout.CENTER);this.add(tf, BorderLayout.NORTH);this.add(panel3, BorderLayout.WEST);this.add(panel4);pack();this.setResizable(false);//窗口不可改变大小this.setLocation(300, 200);this.setDefaultCloseOperation(JFrame.EXIT _ON_CLOSE);}/***统一设置按钮的的使用方式*@param panel*@param name*@param action*@param color*/private void addButton(JPanel panel, String name, ActionListener action, Color color){JButton bt = new JButton(name);panel.add(bt);//在面板上增加按钮bt.setForeground(color);//设置前景（字体）颜色bt.addActionListener(action);//增加监听事件}/***计算器的基础操作（+-×÷）*@param x*/private void getResult (double x){if(oper == "+"){result += x;}else if(oper == "-"){result -= x;}else if(oper == "×"){result *= x;}else if(oper == "÷"){result /= x;}else if(oper == "="){result = x;}tf.setText(df.format(result));}/***运算符号的事件监听*/class Signs implements ActionListener{ public void actionPerformed(ActionEvent e) {/** 用ActionEvent对象的getActionCommand()方法* 取得与引发事件对象相关的字符串*/String str = e.getActionCommand();/* sqrt求平方根*/if(str.equals("sqrt")){double i = Double.parseDouble(tf.getText());if(i>=0){/** String.valueOf() 转换为字符串* df.format() 按要求保留四位小数* Math.sqrt() 求算数平方根*/tf.setText(String.valueOf(df.format(Math.sq rt(i))));}else{tf.setText("负数不能开平方根");}}/* log求常用对数*/else if(str.equals("log")){double i = Double.parseDouble(tf.getText());if(i>0){tf.setText(String.valueOf(df.format(Math.lo g(i))));}else{tf.setText("负数不能求对数");}}/* %求百分比*/else if(str.equals("%")){tf.setText(df.format(Double.parseDouble(tf. getText()) / 100));}/* 1/x求倒数*/else if(str.equals("1/x")){if(Double.parseDouble(tf.getText()) == 0){tf.setText("除数不能为零");}else{tf.setText(df.format(1 / Double.parseDouble(tf.getText())));}}/* sin求正弦函数*/else if(str.equals("sin")){double i = Double.parseDouble(tf.getText());tf.setText(String.valueOf(df.format(Math.si n(i))));}/* cos求余弦函数*/else if(str.equals("cos")){double i = Double.parseDouble(tf.getText());tf.setText(String.valueOf(df.format(Math.co s(i))));}/* tan求正切函数*/else if(str.equals("tan")){double i = Double.parseDouble(tf.getText());tf.setText(String.valueOf(df.format(Math.ta n(i))));}/* n!求阶乘*/else if(str.equals("n!")){double i = Double.parseDouble(tf.getText());if((i%2==0)||(i%2==1))//判断为整数放进行阶乘操作{int j = (int)i;//强制类型转换int result=1;for(int k=1;k<=j;k++)result *= k;tf.setText(String.valueOf(result));}else{tf.setText("无法进行阶乘");}}/* x^2求平方*/else if(str.equals("x^2")){double i = Double.parseDouble(tf.getText());tf.setText(String.valueOf(df.format(i*i)));}/* x^3求立方*/else if(str.equals("x^3")){double i =Double.parseDouble(tf.getText());tf.setText(String.valueOf(df.format(i*i*i)));}/* ′″角度转换*//***将角度值转换成弧度值，方便三角函数的计算*/else if(str.equals("′″")){double i = Double.parseDouble(tf.getText());tf.setText(String.valueOf(i/180*Math.PI));}else{if(flag){IfResult = false;}if(IfResult){oper = str;}else{getResult(Double.parseDouble(tf.getText()) );oper = str;IfResult = true;}}}}/***清除按钮的事件监听*/class Clear implements ActionListener{ public void actionPerformed(ActionEvent e) {/** 用ActionEvent对象的getActionCommand()方法* 取得与引发事件对象相关的字符串*/String str = e.getActionCommand();if(str == "C"){tf.setText("0");IfResult = true;result = 0;}else if(str == "-/+"){double i = 0 - Double.parseDouble(tf.getText().trim());tf.setText(df.format(i));}else if(str == "Backspace"){if(Double.parseDouble(tf.getText()) > 0){if(tf.getText().length() > 1){tf.setText(tf.getText().substring(0,tf.getText().length() - 1));//使用退格删除最后一位字符}else{tf.setText("0");IfResult = true;}}else{if(tf.getText().length() > 2){tf.setText(tf.getText().substring(0,tf.getText().length() - 1));}else{tf.setText("0");IfResult = true;}}}else if(str == "CE"){tf.setText("0");IfResult = true;}}}/***数字输入的事件监听*/class Num implements ActionListener{ public void actionPerformed(ActionEvent e) {String str = e.getActionCommand(); if(IfResult){tf.setText("");IfResult = false;}if(str=="π"){tf.setText(String.valueOf(Math.PI)); }else if(str=="e"){tf.setText(String.valueOf(Math.E)); }else{tf.setText(tf.getText().trim() + str);if(tf.getText().equals("0")){tf.setText("0");IfResult = true;flag = true;}}}}/***小数点的事件监听*/class Dot implements ActionListener{ public void actionPerformed(ActionEvent e) {IfResult = false;if(tf.getText().trim().indexOf(".") == -1){tf.setText(tf.getText() + ".");}}}/***main方法*/public static void main(String[] args) { new Calucator().setVisible(true);}}。