高手支招 java FocusListener焦点事件如何实现在两个JTextField中确认焦点!

刚才写了个程序，楼主看看符合要求不

import javaxswing;

import javaxswingborder;

import javaawt;

import javaawtevent;

class TestFocus extends JFrame implements FocusListener {

JButton btn;

JTextArea text1,text2;

boolean b=true;

public TestFocus() {

btn=new JButton("切换焦点");

btnaddActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

if(b) {

//text2setRequetFocusEnabled(fasle);

text1grabFocus();

b=false;

}

else{

text2grabFocus();

b=true;

}

}

});

JPanel p1=new JPanel(new FlowLayout());

p1add(BoxcreateGlue());

p1add(btn);

p1add(BoxcreateGlue());

JPanel p2=new JPanel(new FlowLayout());

text1=new JTextArea();

text2=new JTextArea();

p2add(create(text1,"第一个文本域"));

p2add(create(text2,"第二个文本域"));

text1addFocusListener(this);

text2addFocusListener(this);

getContentPane()add(p1,"North");

getContentPane()add(p2,"Center");

setVisible(true);

setSize(200,200);

}

public static void main(String [] args) {

new TestFocus();

}

public JScrollPane create(JTextArea text,String s) {

textsetLineWrap(true);

JScrollPane jsp=new JScrollPane(text);

Border border=BorderFactorycreateLineBorder(Colorblue);

jspsetBorder(BorderFactorycreateTitledBorder(border,s,TitledBorderLEFT,TitledBorderTOP));

return jsp;

}

public void focusGained(FocusEvent e) {

JTextArea text=(JTextArea)egetSource();

if(text==text1) {

text1setText("");

text1setText("获得焦点");

}

if(text==text2) {

text2setText("");

text2setText("获得焦点");

}

}

public void focusLost(FocusEvent e) {

JTextArea text=(JTextArea)egetSource();

if(text==text1) {

text1setText("");

text1setText("失去焦点");

}

if(text==text2) {

text2setText("");

text2setText("失去焦点");

}

}

}

用WindowFocusListener可以实现：

import javaawt;

import javaxswing;

import javaawtevent;

public class Test extends JFrame

{

public static void main(String[] args)

{

new Test()setVisible(true);

}

public Test()

{

setSize(300,300);

setDefaultCloseOperation(JFrameEXIT_ON_CLOSE);

addWindowFocusListener(new WindowFocusListener()

{

public void windowGainedFocus(WindowEvent e)

{

setTitle("窗体获得焦点");

}

public void windowLostFocus(WindowEvent e)

{

setTitle("窗体失去焦点");

}

});

}

}

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