(评分系统)java实验报告四

实验报告4

一、实验目的

掌握Swing的使用，设计简单的GUI程序。

二、实验环境

1、微型计算机一台

2、WINDOWS操作系统，Java SDK，Eclipse开发环境

三、实验内容

1、编写一个GUI界面的java程序。要求如下：

1）主窗体首先显示以下内容：

输入选手姓名和评委数后，点击确定，进入下一个界面

2）第二个界面如下：

按要求输入每位评委的评分后，点击提交，将按去掉一个最高分和一个最低分，

取平均值，即为选手的成绩，进入下一个页面。点击重置，所有输入清零。3）第三个界面如下：

显示该选手的成绩，点击按钮回到初始界面，进行下一个选手的评分。

四、实验步骤和结果

主函数代码：

package windowsGUI;

import javax.swing.JFrame;

import javax.swing.JPanel;

public class Main {

public static void main(String[] args) {

// TODO Auto-generated method stub

final JFrame win=new JFrame("我的窗体");

final JPanel panM=new JPanel();

new firstWindows(win,panM);

win.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

win.setSize(500,300);

win.setVisible(true);

}

}

第一个界面代码：

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JPanel;

import javax.swing.JTextField;

import javax.swing.JButton;

public class firstWindows extends JPanel {

private JTextField name=new JTextField(10);

private JTextField cout=new JTextField(10);

private JButton btn = new JButton("确定");

final JPanel pan=new JPanel();

public firstWindows(final JFrame win,final JPanel panM){ win.getContentPane().remove(panM);

JLabel lab1=new JLabel("输入选手姓名：");

JLabel lab2=new JLabel("输入评委数：");

btn.addActionListener(new ActionListener(){

public void actionPerformed(ActionEvent e) {

if(e.getSource()==btn){

final String name1=new String(name.getText());

final int cout1=Integer.parseInt(cout.getText());

new SecondWindows(win,name1,cout1,pan);

}

}

});

pan.add(lab1);

pan.add(name);

pan.add(lab2);

pan.add(cout);

pan.add(btn);

win.add(pan);

win.setVisible(true);

}

}

运行结果及输入：

第二个界面代码：

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JPanel;

import javax.swing.JTextField;

public class SecondWindows extends JPanel{

private JTextField grade1=new JTextField(10);

private JTextField grade2=new JTextField(10);

private JTextField grade3=new JTextField(10);

private JTextField grade4=new JTextField(10);

private JButton btn1 = new JButton("提交");

private JButton btn2 = new JButton("重置");

final JPanel pan2=new JPanel();

public SecondWindows(final JFrame win,final String name2,final int cout1,final JPanel pan){

win.getContentPane().remove(pan);

JLabel lab=new JLabel("正在为"+name2+"选手评分");

JLabel lab1=new JLabel("评委一：");

JLabel lab2=new JLabel("评委二：");

JLabel lab3=new JLabel("评委三：");

JLabel lab4=new JLabel("评委四：");

pan2.setLayout(null);

lab.setBounds(150, 10, 200, 20);

lab1.setBounds(10, 50, 60,20);

grade1.setBounds(80,50,80,20);

lab2.setBounds(210, 50, 60, 20);

grade2.setBounds(280,50,80,20);

lab3.setBounds(10, 100, 60, 20);

grade3.setBounds(80,100,80,20);

lab4.setBounds(210, 100, 60, 20);

grade4.setBounds(280,100,80,20);

btn1.setBounds(90,200,80,30);

btn2.setBounds(220,200,80,30);

btn1.addActionListener(new ActionListener(){

public void actionPerformed(ActionEvent e) {

if(e.getSource()==btn1){

double[] s=new double[cout1];

s[cout1-4]=Integer.parseInt(grade1.getText());

s[cout1-3]=Integer.parseInt(grade2.getText());

s[cout1-2]=Integer.parseInt(grade3.getText());

s[cout1-1]=Integer.parseInt(grade4.getText());

java.util.Arrays.sort(s);

double h=(s[cout1-3]+s[cout1-2])/2;

new TirdWindows(win,name2,h ,pan2);

}

}

});

btn2.addActionListener(new ActionListener(){

public void actionPerformed(ActionEvent e) {

if(e.getSource()==btn2){

grade1.setText("");

grade2.setText("");

grade3.setText("");

grade4.setText("");

}

}

});

pan2.add(lab);

pan2.add(lab1);

pan2.add(grade1);

pan2.add(lab2);

pan2.add(grade2);

pan2.add(lab3);

pan2.add(grade3);

pan2.add(lab4);

pan2.add(grade4);

pan2.add(btn1);

pan2.add(btn2);

win.add(pan2);

win.setVisible(true);

}

运行结果及输入：

若点击出现

第三个界面代码：

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JPanel;

public class TirdWindows {

private JPanel pan3=new JPanel();

private JButton btn = new JButton("回到初始画板");

public TirdWindows(final JFrame win,String name3 ,double h,final JPanel pan2){

win.getContentPane().remove(pan2);

JLabel lab=new JLabel("选手"+name3+"最终得分为："+h);

pan3.setLayout(null);

lab.setBounds(80, 10, 200, 20);

btn.setBounds(300,10,120,20);

pan3.add(lab);

pan3.add(btn);

btn.addActionListener(new ActionListener(){

public void actionPerformed(ActionEvent e) {

if(e.getSource()==btn){

new firstWindows(win,pan3);

}

}

});

win.add(pan3);

win.setVisible(true);

}

}

运行结果：

点击出现

五、实验总结

(1)为完成本次实验，历尽千辛万苦。

1、实验在主函数创建一个窗体，使用匿名类创建一个面板，再把此面板添加到窗体中。

2、去除原面板，在创建一个面板，把新面板添加到窗体中。

3、以此类推，最后做回到初始画板操作时，添加第一个面板。

4、完成本次实验。

(2)传递原面板与窗体时，使用类的构造函数，如：

new SecondWindows(win,name1,cout1,pan);

public SecondWindows(final JFrame win,final String name2,final int cout1,final JPanel pan){}

(3)本实验使用绝对定位设置组件大小与位置。

package zq;

import java.awt.Color;

import java.awt.Dimension;

import java.awt.Rectangle;

import java.awt.Toolkit;

import java.awt.event.KeyEvent;

import java.util.Arrays;

import javax.swing.ImageIcon;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JPanel;

import javax.swing.JTextField;

import javax.swing.JButton;

public class zq extends JFrame{

private static final long serialVersionUID = 1L;

private JPanel jContentPane = null;

private JLabel jLabel_input = null;

private JTextField jTextField_input = null;

private JButton jButton_sure = null;

private JButton jButton_sur = null;

private JLabel jLabel_title = null;

private JButton jButton_cancel = null;

private JTextField str2[] = new JTextField[20];

private JLabel str[] = new JLabel[20];

private JLabel jLabel_2 = null;

private JTextField jText = null;

private int n=0;

/**

* * This is the default constructor

* @return

*

* */

public void SwingOk() {

initialize();

}

/** * This method initializes this * * @return void */

private void initialize() {

this.setSize(315, 207);

this.setContentPane(getContentPane());

this.setTitle("评分系统");

this.setResizable(false);//设置不能更改大小

((JPanel)

this.getContentPane()).setOpaque(false);

ImageIcon img = new ImageIcon("62.JPG");

JLabel background = new JLabel(img);

background.setSize(new Dimension(1024, 717));

this.getLayeredPane().add(background, new

Integer(Integer.MIN_VALUE));

background.setBounds(0, 0, img.getIconWidth(), img.getIconHeight());

}

/** * This method initializes jContentPane * * @return

javax.swing.JPanel */

private JPanel getJContentPane() {

if (jContentPane == null) {

jLabel_title = new JLabel();

jLabel_title.setBounds(new Rectangle(73, 20, 159, 36));

jLabel_title.setText("欢迎使用评委评分系统");

jLabel_input = new JLabel();

jLabel_input.setBounds(new Rectangle(40, 81, 112, 28));

jLabel_input.setText("请输入评委人数：");

jContentPane = new JPanel();

jContentPane.setLayout(null);

jContentPane.add(jLabel_input, null);

jContentPane.add(getJTextField_input(), null);

jContentPane.add(getJButton_cancel(), null);

jContentPane.add(jLabel_title, null);

jContentPane.add(getJButton_cancel(), null);

}

return jContentPane;

}

private String getJButton_cancel() {

// TODO Auto-generated method stub

return null;

}

private JTextField getJTextField_input() {

if (jTextField_input == null) {

jTextField_input = new JTextField();

jTextField_input.setBounds(new Rectangle(182, 81, 75, 27));

jTextField_input.setToolTipText("请输入4到16的整数");

/** * 下面创建快捷键enter */

jTextField_input.addKeyListener(new

java.awt.event.KeyListener() {

public void keyPressed(java.awt.event.KeyEvent e) {

if (e.getKeyCode() == 10) {

if(jButton_sure.getText().equals("重置")){

jContentPane.remove(jLabel_2);

jContentPane.remove(jText);

jContentPane.remove(jButton_sur);

jButton_sur=null;

for(int i=1;i<=n;i++){

jContentPane.remove(str[i]);

jContentPane.remove(str2[i]);

}

jTextField_input.setEditable(true);

jButton_sure.setText("确认");

jButton_sur.addActionListener(new

java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent e) {

int i=0;

try {

double a[] = new double[n];

for (i = 0; i < n; i++) {

a[i] = Double.parseDouble((str2[i + 1].getText()));

}

Arrays.sort(a);

double sum = 0;

for (i = 1; i < n - 1; i++)

{

sum += a[i];

System.out.println(a[i]);

}

sum = sum / (n - 2);

System.out.println(sum);

String s=Double.toString(sum);

int

end=s.indexOf('.')+3>s.length()?s.length():s.indexOf('.')+3;

jText.setText(s.substring(0, end));

}

catch (NumberFormatException e1) {

JOptionPane.showMessageDialog(null, "第"+(i+1)+"位评委输入有误！","警告",2);

return ;

}

}

});

}

return jButton_sur;

}

public static void main(String[] args;{

SwingOk frame = new SwingOk();

Center.centerFrame(frame);

frame.setVisible(true);

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

}

class Center {

public static void centerFrame(JFrame frame) {

Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();

Dimension frameSize = frame.getSize();

if (frameSize.height > screenSize.height) {

frameSize.height = screenSize.height;

}

if (frameSize.width > screenSize.width) {

frameSize.width = screenSize.width;

}

frame.setLocation((screenSize.width - frameSize.width) / 2,

(screenSize.height - frameSize.height) / 2);

}

}