jjisuanqi.java

计算器 一个实现简单的加

package com.luo.test;

import java.awt.*;
import java.awt.event.*;

import javax.swing.*;


public class Jjisuanqi extends JFrame {
	
	JButton[] b = new JButton[16];
	JPanel pa,pb;
	JTextField t;
	JLabel l;
	StringBuffer strb;
	int arg = 0; 
	boolean start = true;
	String op = "=";
	
	public Jjisuanqi (String titel){
		super(titel);
		this.go();
		this.addWindowListener(new WindowAdapter(){
			
				public void windowClosing(WindowEvent e) {
					setVisible(false);
					dispose();
					System.exit(0);
			}

		});
	}
	
	private  void go() {
		pa = new JPanel();
		pb = new JPanel(new GridLayout(4,4));
		
		
		

		class ButtenListener implements ActionListener{
			
		public void actionPerformed(ActionEvent e) {
			String s = e.getActionCommand();
			if('0'<=s.charAt(0) && s.charAt(0) <= '9'){
				if(start)t.setText(e.getActionCommand());	
				else t.setText(t.getText()+e.getActionCommand());
					start = false;
			}
			else{
				if(start){
					if(s.equals("-")){
						t.setText(s);start = false;
					}
					else op = s;
				}
				else{
					int x = Integer.parseInt(t.getText());
					cauleate(x);
					op = s;
					start = true;
				}
			}
			
		}
		private void cauleate(int x) {
			if(op.equals("+")) arg +=x;
			else if (op.equals("-")) arg -=x;
			else if (op.equals("*")) arg *=x;
			else if (op.equals("/")) arg /=x;
			else if (op.equals("=")) arg =x;
			t.setText(""+arg);
		}
		
		}
		
		for(int i = 0;i<10;i++){
			b[i] = new JButton(new Integer(i).toString());
			b[i].addActionListener(new ButtenListener());
		}
		b[10] = new JButton("CE");b[10].addActionListener(new ActionListener(){

			public void actionPerformed(ActionEvent e) {
			
				t.setText(strb.toString());
				
			}
			
		});
		b[11] = new JButton("+");b[11].addActionListener(new ButtenListener());
		b[12] = new JButton("-");b[12].addActionListener(new ButtenListener());
		b[13] = new JButton("*");b[13].addActionListener(new ButtenListener());
		b[14] = new JButton("/");b[14].addActionListener(new ButtenListener());
		b[15] = new JButton("=");b[15].addActionListener(new ButtenListener());
		
		t = new JTextField("",25);t.setEditable(false);
		l = new JLabel("0",Label.RIGHT);
		strb = new StringBuffer(t.getText());
		
		
		
		pb.add(b[9]);pb.add(b[8]);pb.add(b[7]);pb.add(b[14]);
		pb.add(b[6]);pb.add(b[5]);pb.add(b[4]);pb.add(b[13]);
		pb.add(b[3]);pb.add(b[2]);pb.add(b[1]);pb.add(b[12]);
		pb.add(b[0]);pb.add(b[11]);pb.add(b[10]);pb.add(b[15]);
		
		pa.add(t);
		
		
		this.setBounds(300,200,5,10);
		this.setSize(300,200);
		this.add(pa,BorderLayout.NORTH);
		this.add(pb,BorderLayout.CENTER);
		this.setVisible(true);
	}
	
	class MyLetion implements ActionListener{

		public void actionPerformed(ActionEvent e) {
			String s = e.getActionCommand();
			
			if(start){
				if(s.equals("-")){
					t.setText(s);start = false;
				}
				else op = s;
			}
			else{
				int x = Integer.parseInt(t.getText());
				cauleate(x);
				op = s;
				start = true;
			}
		}

		private void cauleate(int x) {
			if(op.equals("+")) arg +=x;
			else if (op.equals("-")) arg -=x;
			else if (op.equals("*")) arg *=x;
			else if (op.equals("/")) arg /=x;
			else if (op.equals("=")) arg =x;
			t.setText(""+arg);
		}
		
		
		
	}
	
	public static void main(String[] args) {
		new Jjisuanqi("计算器");

	}

}