java作业图形用户界面.doc

第一题：import javax.swing.JFrame;import java.awt.*;import java.awt.event.*;import javax.swing.*;public class Fahrenheit /* * param args */public static void main(String args) / TODO Auto-generated method stubJFrame frame = new JFrame(Fahrenheit);frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);FahrenheitPanel panel = new FahrenheitPanel();frame.getContentPane().add(panel);frame.pack();frame.setVisible(true);class FahrenheitPanel extends JPanelprivate JLabel inputLabel,outputLabel,resultLabel;private JButton OK;private JTextField fahrenheit;public FahrenheitPanel()inputLabel = new JLabel(Enter Fahrenheit temperature:);outputLabel = new JLabel(Temperature in Celsius:);resultLabel = new JLabel(-);OK = new JButton (OK!);fahrenheit = new JTextField(5);fahrenheit.addActionListener(new TempListener();OK.addActionListener(new TempListener();add(inputLabel);add(fahrenheit);add(outputLabel);add(resultLabel);add(OK);setPreferredSize (new Dimension(300,75);setBackground(Color.green);private class TempListener implements ActionListener public void actionPerformed (ActionEvent event)int fahrenheitTemp,celsiusTemp;String text = fahrenheit.getText();fahrenheitTemp = Integer.parseInt(text);celsiusTemp = (fahrenheitTemp-31)*5/9;resultLabel.setText(Integer.toString(celsiusTemp);第二题：import javax.swing.JFrame;import java.awt.*;import java.awt.event.*;import javax.swing.*;public class Random /* * param args */public static void main(String args) JFrame frame = new JFrame(Random game );frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);RandomPanel panel = new RandomPanel();frame.getContentPane().add(panel);frame.pack();frame.setVisible(true);class RandomPanel extends JPanelprivate JLabel resultLabel;private int randomNumber;private JButton OK;public RandomPanel()resultLabel = new JLabel(-); OK= new JButton(确定!);OK.addActionListener(new ButtonListener();add(resultLabel);add(OK);setPreferredSize(new Dimension(300,100);setBackground(Color.blue);private class ButtonListener implements ActionListenerprivate final int BASE = 100;public void actionPerformed(ActionEvent event)String result = (you get:+randomNumber);randomNumber=(int)(Math.random()*BASE+1);resultLabel.setText(result);第三题：import java.awt.*;import java.awt.event.*;import javax.swing.*;public class UpDownpublic static void main(String args) JFrame frame=new JFrame(ChangeData ); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.getContentPane().add(new ChangeData() ); frame.pack(); frame.setVisible(true);class ChangeData extends JPanel /* * */private int count;private JButton up,down;private JLabel label;private JPanel buttonPanel;public ChangeData()count=50;up=new JButton(Up);down=new JButton(Down);up.addActionListener(new ButtonListener();down.addActionListener(new ButtonListener();label=new JLabel(data: +count);buttonPanel=new JPanel();buttonPanel.setPreferredSize(new Dimension(300,40);buttonPanel.setBackground(Color.red);buttonPanel.add(up);buttonPanel.add(down);setPreferredSize(new Dimension(300,60);setBackground(Color.green);add(label);add(buttonPanel);public class ButtonListener implements