实验报告---计算器

实验报告课程名称：java程序设计题目：计算器院（系）：信息与控制工程专业班级：计算机1202姓名：张金涛学号：120620226指导教师：张翔2014年12 月17 月一、实验目的1.熟悉java图形用户界面的设计原理和程序结构2.能设计复核问题要求的图形用户界面程序3.熟悉java awt和swing的组合4.掌握常用组建的事件借口5.会应用awt和swing组件进行应用程序设计二、实验环境装有jdk及eclipse的计算机一台三、实验内容使用java编写出具有基本计算功能的计算器，要求具有用户图形界面。

四、代码及注释import java.awt.*;import java.awt.event.*;import javax.swing.*;import java.util.Vector;public class CalcullatorApp{String str1 = "0"; // 运算数1 初值一定为0String str2 = "0"; // 运算数2初值一定为0String fh = "+"; // 运算符String jg = "";// 结果// 状态开关重要int k1 = 1;// 开关1 用于选择输入方向将要写入str2或 str2int k2 = 1;// 开关2 符号键次数 k2>1说明进行的是2+3-9+8 这样的多符号运算int k3 = 1;// 开关3 str1 是否可以被清0 ==1时可以 !=1时不能被清0int k4 = 1;// 开关4 str2 同上int k5 = 1;// 开关5 控制小数点可否被录入 ==1时可以 !=1 输入的小数点被丢掉JButton jicunqi; // 寄存器记录是否连续按下符号键Vector vt = new Vector(20, 10);JFrame frame = new JFrame("计算器"); //创建一个新的、初始不可见的、具有指定标题的 Frame。

JTextField jg_TextField = new JTextField(jg, 20); //20列JButton clear_Button = new JButton("清除");JButton button0 = new JButton("0");JButton button1 = new JButton("1");JButton button2 = new JButton("2");JButton button3 = new JButton("3");JButton button4 = new JButton("4");JButton button5 = new JButton("5");JButton button6 = new JButton("6");JButton button7 = new JButton("7");JButton button8 = new JButton("8");JButton button9 = new JButton("9");JButton button_Dian = new JButton(".");JButton button_jia = new JButton("+");JButton button_jian = new JButton("-");JButton button_cheng = new JButton("*");JButton button_chu = new JButton("/");JButton button_dy = new JButton("=");////////////////////////////////////////////////////////////////////// public static void main(String[] args){CalcullatorApp tuo = new CalcullatorApp();}/////////////////////////////////////////////////////////////////////// CalcullatorApp(){button0.setMnemonic(KeyEvent.VK_0);// 等效键// 其它等效键略,jg_TextField.setHorizontalAlignment(JTextField.RIGHT);// 文本框右对齐JPanel pan = new JPanel();pan.setLayout(new GridLayout(4, 4, 5, 5));// 四行四列边距为5像素pan.add(button7);pan.add(button8);pan.add(button9);pan.add(button_chu);pan.add(button4);pan.add(button5);pan.add(button6);pan.add(button_cheng);pan.add(button1);pan.add(button2);pan.add(button3);pan.add(button_jian);pan.add(button0);pan.add(button_Dian);pan.add(button_dy);pan.add(button_jia);pan.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));// pan 对象的边距JPanel pan2 = new JPanel();pan2.add(jg_TextField);JPanel pan3 = new JPanel(); // 为什么要多此一句呢？因为我不会设置按钮的大小pan3.setLayout(new FlowLayout());pan3.add(clear_Button);// clear_Button.setSize(10,10);//设置清零按钮的大小吗的不好使！！frame.setLocation(300, 200); // 主窗口出现在位置frame.setResizable(false); // 不能调大小frame.getContentPane().setLayout(new BorderLayout());//面板方位frame.getContentPane().add(pan2, BorderLayout.NORTH); frame.getContentPane().add(pan, BorderLayout.CENTER); frame.getContentPane().add(pan3, BorderLayout.SOUTH);//frame.add(pan2, BorderLayout.NORTH);//frame.add(pan, BorderLayout.CENTER);//frame.add(pan3, BorderLayout.SOUTH);frame.pack();frame.setVisible(true);// 以上是控件和布局// 下面是事件处理程序// --------------- 数字键 --------------class JianTing implements ActionListener{public void actionPerformed(ActionEvent e){String ss = ((JButton) e.getSource()).getText();jicunqi = (JButton) e.getSource();vt.add(jicunqi);if (k1 == 1){if (k3 == 1){str1 = "";k5 = 1;// 还原开关k5状态}str1 = str1 + ss;// k2=1;k3 = k3 + 1;// System.out.println(str1);jg_TextField.setText(str1);// 显示}else if (k1 == 2){if (k4 == 1){str2 = "";k5 = 1; // 还原开关k5状态}str2 = str2 + ss;// k2=2;k4 = k4 + 1;// /////////////测试////////////////jg_TextField.setText(str2);}}}// －－－－－－－－符号－－－－－－－－－－－class JianTing_fh implements ActionListener{public void actionPerformed(ActionEvent e){String ss2 = ((JButton) e.getSource()).getText();jicunqi = (JButton) e.getSource();vt.add(jicunqi);if (k2 == 1){k1 = 2;// 开关 k1 为1时,向数1写为2时，向数2写k5 = 1;fh = ss2;k2 = k2 + 1;// 按符号键的次数}else{int a = vt.size();JButton c = (JButton) vt.get(a - 2);if (!(c.getText().equals("+"))&& !(c.getText().equals("-"))&& !(c.getText().equals("*"))&& !(c.getText().equals("/"))){yuns();str1 = jg;k1 = 2;// 开关 k1 为1时,向数1写为2时，向数2写k5 = 1;k4 = 1;fh = ss2;}k2 = k2 + 1;}}}// －－－－－－－－清除－－－－－－－class JianTing_clear implements ActionListener{public void actionPerformed(ActionEvent e){jicunqi = (JButton) e.getSource();vt.add(jicunqi);k5 = 1;k2 = 1;k1 = 1;k3 = 1;k4 = 1;str1 = "0";str2 = "0";fh = "";jg = "";jg_TextField.setText(jg);vt.clear();}}// ----------------等于 ---------------------class JianTing_dy implements ActionListener{public void actionPerformed(ActionEvent e){jicunqi = (JButton) e.getSource();vt.add(jicunqi);yuns();k1 = 1; // 还原开关k1状态// str1=jg;k2 = 1;k3 = 1;// 还原开关k3状态k4 = 1; // 还原开关k4状态str1 = jg; // 为7+5=12 +5=17 这种计算做准备}}// ----------------小数点 ---------------------class JianTing_xiaos implements ActionListener{public void actionPerformed(ActionEvent e){jicunqi = (JButton) e.getSource();vt.add(jicunqi);if (k5 == 1) {String ss2 = ((JButton) e.getSource()).getText();if (k1 == 1) {if (k3 == 1) {str1 = "";k5 = 1; // 还原开关k5状态}str1 = str1 + ss2;// k2=1;k3 = k3 + 1;// System.out.println(str1);jg_TextField.setText(str1);// 显示} else if (k1 == 2){if (k4 == 1){str2 = "";k5 = 1; // 还原开关k5状态}str2 = str2 + ss2;// k2=2;k4 = k4 + 1;// /////////////测试////////////////jg_TextField.setText(str2);}}k5 = k5 + 1; //}}// 注册监听器JianTing_dy jt_dy = new JianTing_dy();JianTing jt = new JianTing();// 临听数字键JianTing_fh jt_fh = new JianTing_fh();// 临听符号键JianTing_clear jt_c = new JianTing_clear(); // 清除键JianTing_xiaos jt_xs = new JianTing_xiaos();// 小数点键button7.addActionListener(jt);button8.addActionListener(jt);button9.addActionListener(jt);button_chu.addActionListener(jt_fh);button4.addActionListener(jt);button5.addActionListener(jt);button6.addActionListener(jt);button_cheng.addActionListener(jt_fh);button1.addActionListener(jt);button2.addActionListener(jt);button3.addActionListener(jt);button_jian.addActionListener(jt_fh);button0.addActionListener(jt);button_Dian.addActionListener(jt_xs);button_dy.addActionListener(jt_dy);button_jia.addActionListener(jt_fh);clear_Button.addActionListener(jt_c);// 关闭事件处理程序frame.addWindowListener(new WindowAdapter(){public void windowClosing(WindowEvent e){System.exit(0);}});}// ---------------计算------------------public void yuns(){double a2;// 运算数1double b2;// 运算数2String c = fh;// 运算符double jg2 = 0;// 结果if (c.equals("")){// System.out.println("请输入运算符");jg_TextField.setText("请输入运算符");}else{System.out.println("str1:" + str1);// 调试时使用System.out.println("str2:" + str2);// 调试时使用System.out.println("运算符:" + fh);// 调试时使用if (str1.equals(".")) //字符串"."转换成double型数据时会出错所以手工转str1 = "0.0";if (str2.equals("."))str2 = "0.0";a2 = Double.valueOf(str1).doubleValue();b2 = Double.valueOf(str2).doubleValue();System.out.println("double型的a2：" + a2); //调试时使用System.out.println("double型的b2：" + b2); //调试时使用if (c.equals("+")){jg2 = a2 + b2;}if (c.equals("-")){jg2 = a2 - b2;}if (c.equals("*")){jg2 = a2 * b2;}if (c.equals("/")){if (b2 == 0) {jg2 = 0;} else {jg2 = a2 / b2;}}System.out.println("double型a2" + fh + "b2结果：" + jg2);System.out.println();jg = ((new Double(jg2)).toString());jg_TextField.setText(jg);}}}五、运行结果六、实验总结通过对计算器窗体的编写我熟悉java图形用户界面的设计原理和程序结构熟悉java awt和swing的组合。