counter.java

Java课程中所有的可运行程序 全部都是java课程中所涉及到的源码

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

 public class counter extends Applet{

public void init() {

	l1=new Label("No1:");
	add(l1);

	txt1=new TextField(12);
	add(txt1);

	l2=new Label("No2:");
	add(l2);

	txt2=new TextField(12);
	add(txt2);

	l3=new Label("Result:");
	add(l3);

	txt3=new TextField(13);
	add(txt3);
	txt3.setEditable(false);


	b1=new Button("+");
b1.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent e){
                processAction(e);}
                  }  );

add(b1);

b2=new Button("-");
b2.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent e){
                processAction(e);}
                  }  );

add(b2);

b3=new Button("*");
b3.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent e){
                processAction(e);}
                  }  );
	add(b3);

b4=new Button("/");
b4.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent e){
                processAction(e);}
                  }  );
	add(b4);

b5=new Button("C");
b5.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent e){
                processAction(e);}
                  }  );
	add(b5);


	}


	//{{DECLARE_CONTROLS

	Label l1,l2,l3,l4;
	TextField txt1,txt2,txt3;
	Button b1,b2,b3,b4,b5;

public void processAction(ActionEvent e){
Object obj=e.getSource();

if(obj==b1){
float no2=Float.valueOf(txt2.getText()).floatValue();
	float no1=Float.valueOf(txt1.getText()).floatValue();
	   float no3=no1+no2;
	   String ss=new String();
txt3.setText(ss.valueOf(no3) );	    }

if(obj==b2){
float no2=Float.valueOf(txt2.getText()).floatValue();
	float no1=Float.valueOf(txt1.getText()).floatValue();
	   float no3=no1-no2;
	   String ss=new String();
txt3.setText(ss.valueOf(no3) );	    }

if(obj==b3){
float no2=Float.valueOf(txt2.getText()).floatValue();
	float no1=Float.valueOf(txt1.getText()).floatValue();
	   float no3=no1*no2;
	   String ss=new String();
txt3.setText(ss.valueOf(no3) );	    }

if(obj==b4){
float no2=Float.valueOf(txt2.getText()).floatValue();
	float no1=Float.valueOf(txt1.getText()).floatValue();
	   float no3=no1/no2;
	   String ss=new String();
txt3.setText(ss.valueOf(no3));	    }

if(obj==b5){
txt2.setText("");
          txt1.setText("");
	      }


}

    }