focuseventdemo.java

java课程的资料以及实验的代码

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

public class FocusEventDemo{
	public static void main(String[] args){
			new MyFrame() ;
	}	
}

class MyFrame extends Frame{
	Label lblCreator = new Label("制单人") ;
	Label lblCheckor = new Label("审核人") ;
	Label lblMoney = new Label("金额") ;
	
	TextField tFieldCreator = new TextField(20) ;
	TextField tFieldCheckor = new TextField(20) ;
	TextField tFieldMoney = new TextField(20) ;
	MyFrame(){
		super("记帐") ;
		setLayout(new GridLayout(4,4));
				
		add(lblCreator) ;		
		add(tFieldCreator) ;
		
		add(lblCheckor) ;
		add(tFieldCheckor) ;
		
		add(lblMoney) ;
		add(tFieldMoney) ;

		
		tFieldCheckor.addFocusListener(new MyFocusAdapter()) ;
		
		setSize(300,160) ;
		show() ;

	}
	
	private class MyFocusAdapter extends FocusAdapter{
		public void focusLost(FocusEvent event){
			if(tFieldCheckor.getText().equals(tFieldCreator.getText()))
				tFieldCheckor.setText("制单人与审核人不能相同") ;
				
				
		}
		
		public void focusGained(FocusEvent event){
			//tFieldCreator.setText("gained") ;
		}
	};
	
	

}