-- 作者:admin
-- 发布时间:2008/6/17 22:27:07
-- 简单计算器样本(自考机试)
import java.awt.*; import java.awt.event.*; import javax.swing.*;
public class Calculator { public static void main(String args[]) { MyFrame m=new MyFrame("计算器"); Toolkit theKit = m.getToolkit(); Dimension wndSize = theKit.getScreenSize(); m.setBounds(wndSize.width/4, wndSize.height/4, wndSize.width/2, wndSize.height/2); m.setVisible(true); m.pack(); } }
class MyFrame extends JFrame implements ActionListener { JTextField jtf; JPanel jp; JButton[] jb; JButton jb1,jb2; int num1,num2;
public MyFrame(String title) { super(title); getContentPane().setLayout(new BorderLayout(0,0)); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
jtf=new JTextField(); jp=new JPanel(); jp.setLayout(new GridLayout(4,3)); jb=new JButton[10]; jb1=new JButton("+"); jb2=new JButton("="); for(int i=0;i<jb.length;i++) { jb[i]=new JButton(String.valueOf(i)); jb[i].addActionListener(this); jp.add(jb[i]); } jb1.addActionListener(this); jb2.addActionListener(this); jp.add(jb1); jp.add(jb2); getContentPane().add(jtf,BorderLayout.NORTH); getContentPane().add(jp,BorderLayout.CENTER); } public void actionPerformed(ActionEvent e) { JButton be=(JButton)e.getSource(); String bt=be.getText(); if(bt.equals("+")) { num1=Integer.parseInt(jtf.getText()); jtf.setText(""); } else if(bt.equals("=")) { num2=Integer.parseInt(jtf.getText()); jtf.setText(String.valueOf(num1+num2)); } else { jtf.setText(jtf.getText()+bt); } } }
[此贴子已经被作者于2010-12-12 08:27:13编辑过]
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