[精品源码]经典Java程序源代码分享

1.加法器（该java源文件的名称是Adder.java）

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

public class Adder implements ActionListener

{

JFrame AdderFrame;

JTextField TOprand1;

JTextField TOprand2;

JLabel LAdd,LSum;

JButton BAdd,BClear;

JPanel JP1,JP2;

public Adder()

{

AdderFrame=new JFrame("AdderFrame");

TOprand1=new JTextField("0.0");

TOprand2=new JTextField("0.0");

LAdd=new JLabel("+");

LSum=new JLabel("= ");

BAdd=new JButton("Add");

BClear=new JButton("Clear");

JP1=new JPanel();

JP2=new JPanel();

BAdd.addActionListener(this);

BClear.addActionListener(new ActionListener()

{

public void actionPerformed(ActionEvent event)

{

TOprand1.setText("0.0");

TOprand2.setText("0.0");

LSum.setText("=");

}

});

AdderFrame.add(JP1);

JP1.add(TOprand1);

JP1.add(LAdd);

JP1.add(TOprand2);

JP1.add(LSum);

AdderFrame.add(JP2);

JP2.add(BAdd);

JP2.add(BClear);

AdderFrame.getContentPane().setLayout(new BorderLayout());

AdderFrame.getContentPane().add(JP1,BorderLayout.NORTH);

AdderFrame.getContentPane().add(JP2,BorderLayout.SOUTH);

AdderFrame.addWindowListener(new WindowAdapter()

{

public void windowClosing(WindowEvent event)

{

System.exit(0);

}

});

AdderFrame.pack();

AdderFrame.setVisible(true);

AdderFrame.setResizable(false);

AdderFrame.setSize(250,100);

}

public void actionPerformed(ActionEvent event)

{

double sum=(double)(Double.valueOf(TOprand1.getText()).doubleva lue()+Double.valueOf(TOprand2.getText()).doubleva lue());

LSum.setText("="+sum);

}

public static void main(String[] args)

{

Adder adder=new Adder();

}

}

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