button.java

java程序设计 清华出版社 孙燮华老师编写的程序源代码

//button.java
import java.awt.*;
import java.awt.event.*;

public class button extends Frame implements ActionListener{
  TextField text1;
  Button button1,button2;

  public button(){
    setLayout(new FlowLayout());
    text1=new TextField("This is my First Button.",20);
    button1=new Button("Click Here!");
    button2=new Button("Exit");
    button1.addActionListener(this);
    button2.addActionListener(this);
    add(text1);
    add(button1);
    add(button2);
    setSize(200,200);
    setVisible(true);
  }
  public void actionPerformed(ActionEvent event){
    String msg=new String("Welcome to Java!");                       
    if(event.getSource()==button1){
      text1.setText(msg);
    }
    else if(event.getSource()==button2){
      System.exit(0);
    }
  }
  public static void main(String args[]){
    button myButton=new button();
  }
}