Question

Java小题，急用（下午四点前有效）一个多行文本域ta，一个按钮ok，初始文本框内容为空，点击按钮。。

有一个多行文本域ta，一个按钮ok，初始文本框内容为空，点击按钮，文本框出现”I am a student....“并利用匿名类实现对窗口关闭的监听

Answer 1

import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JTextArea;

public class OneButton extends JFrame {

private JTextArea textArea;
public static void main(String args[]) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
OneButton frame = new OneButton();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}

/**
* Create the frame
*/
public OneButton() {
super();
getContentPane().setLayout(null);
setBounds(100, 100, 314, 234);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

final JButton okButton = new JButton();
okButton.addActionListener(new ActionListener() {
public void actionPerformed(final ActionEvent arg0) {
textArea.setText("I am a student,and you?");
}
});
okButton.setText("OK");
okButton.setBounds(3, 69, 61, 36);
getContentPane().add(okButton);

textArea = new JTextArea();
textArea.setBounds(70, 7, 226, 184);
getContentPane().add(textArea);
}
}

Answer 2

import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JTextArea;

public class SwingTest {
public static void main(String[] args) {
JFrame f = new JFrame();
//利用匿名类实现对窗口关闭的监听
f.addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e){
System.out.println("正在关闭窗口...");
System.exit(0);
}
});

//文本区
final JTextArea ta = new JTextArea();

//按钮
JButton b = new JButton("OK");

//利用匿名类实现对按钮的监听
b.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
ta.setText("I am a student.And you?");
}
});

//窗口排版显示
f.getContentPane().setLayout(new BorderLayout());
f.add(b,BorderLayout.WEST);
f.add(ta);
f.setSize(300,200);
f.setLocationRelativeTo(null);
f.setVisible(true);
}
}