import java.awt.event.WindowEvent;
import java.awt.event.WindowStateListener;

import javax.swing.JFrame;

public class WinFrame extends JFrame {

 public WinFrame(){
  this.setName("Window 窗口狀態");
  this.setSize(300,300);
  this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  this.addWindowStateListener(new WindowStateListener () {

   public void windowStateChanged(WindowEvent state) {

    if(state.getNewState() == 1 || state.getNewState() == 7) {
     System.out.println("窗口最小化");
    }else if(state.getNewState() == 0) {
     System.out.println("窗口恢復到初始狀態");
    }else if(state.getNewState() == 6) {
     System.out.println("窗口最大化");
    }
   }
  });
  this.setVisible(true);
 }
 public static void main(String[] args) {
  new WinFrame();
 }
}

public class Test(){
    public static void main(String[] args){
  JFrame frame = new JFrame();
  JPanel panel = new JPanel();
  JTextArea textArea = new JTextArea();

  panel.setLayout(new GridLayout());
  textArea.setText("test");
  //當TextArea里的內容過長時生成滾動條
  panel.add(new JScrollPane(textArea));
  frame.add(panel);

  frame.setSize(200,200);
  frame.setVisible(true);
 }
}