Question

java中如何用Tab键改变文本框的焦点?

Answer 1

import java.awt.FlowLayout;
import java.awt.event.FocusEvent;
import java.awt.event.FocusListener;
import javax.swing.*;
public class Example6_13
{
	public static void main(String[] args)
	{
		new FocusTest();
	}
}
class FocusTest extends JFrame
{
	JTextField txt1,txt2;
	public FocusTest()
	{
		setTitle("焦点事件示例");
		setBounds(300,200,350,200);
		setVisible(true);
		setLayout(new FlowLayout());
		setDefaultCloseOperation(EXIT_ON_CLOSE);
		txt1=new JTextField("",10);
		txt2=new JTextField("",10);
		txt1.addFocusListener(new txtFocus());
		txt2.addFocusListener(new txtFocus());
		add(txt1);
		add(txt2);
		add(new JButton("确定"));
		add(new JLabel("使用Tab键改变组件的焦点"));
		validate();
	}
	class txtFocus implements FocusListener
	{
		public void focusGained(FocusEvent e)
		{
			if(e.getSource()==txt1)
				txt1.setText("得到焦点");
			else
				txt2.setText("得到焦点");
		}
		public void focusLost(FocusEvent e)
		{
			if(e.getSource()==txt1)
				txt1.setText("失去焦点");
			else
				txt2.setText("失去焦点");
		}
	}
}