java小程序——简单计算器

import java.applet.Applet;import java.awt.Button;import java.awt.Label;import java.awt.TextField;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import javax.sound.sampled.AudioInputStream;import javax.swing.JButton;import com.sun.media.sound.Toolkit;public class c extends Applet implements ActionListener {/** * @param args */Label res,res2,res3;TextField firstnum,secondnum,result;Button b1,b2,b3,b4,clear,re;int test,z;public void init(){firstnum=new TextField(30);secondnum=new TextField(30);result =new TextField(30);res =new Label("第一个整数");res2=new Label("第二个整数");res3=new Label("计算结果：");setLayout(null);//关闭默认管理布局add(res);res.setBounds(0,0,70,30);add(res2);res2.setBounds(0,30,70,30);add(res3);res3.setBounds(0,70,70,30);add(firstnum);firstnum.setBounds(80,10,80,20);add(secondnum);secondnum.setBounds(80,40,80,20);add(result);result.setBounds(80,75,80,20);b1= new Button("+");b2= new Button("-");b3= new Button("*");b4= new Button("/");re= new Button("=");clear= new Button("clear");add(re);re.setBounds(30,100,35,25);add(clear);clear.setBounds(80,100,35,25);add(b1);b1.setBounds(10,140,25,20);add(b2);b2.setBounds(45,140,25,20);add(b3);b3.setBounds(80,140,25,20);add(b4);b4.setBounds(115,140,25,20);b1.addActionListener(this);b2.addActionListener(this);b3.addActionListener(this);b4.addActionListener(this);re.addActionListener(this);clear.addActionListener(this);}public void actionPerformed(ActionEvent e){//JButton t=(JButton) e.getSource();if(e.getActionCommand().equals("+"))test=1;if(e.getActionCommand().equals("-"))test=2;if(e.getActionCommand().equals("*"))test=3;if(e.getActionCommand().equals("/"))test=4;if(e.getActionCommand().equals("=")){int x=Integer.parseInt(firstnum.getText());int y=Integer.parseInt(secondnum.getText());boolean flag=false;switch(test){case 1:z=x+y;break;case 2:z=x-y;break;case 3:z=x*y;break;case 4:if(y==0)flag=true;else z=x/y;break;default:flag=true;}if(flag==true)result.setText("0");else result.setText(Integer.toString(z));}if(e.getActionCommand().equals("clear")){firstnum.setText("");secondnum.setText("");result.setText("");}}}