package gridlayout;import java.awt.*;import java.awt.event.*;import javax.swing.*;public class Frame1 extends JFrame {  JPanel contentPane;  GridLayout gridLayout1 = new GridLayout();  Button button1 = new Button();  Button button2 = new Button();  Button button3 = new Button();  Button button4 = new Button();  Button button5 = new Button();  Button button6 = new Button();  Button button7 = new Button();  /**Construct the frame*/  public Frame1() {    enableEvents(AWTEvent.WINDOW_EVENT_MASK);    try {      jbInit();    }    catch(Exception e) {      e.printStackTrace();    }  }  /**Component initialization*/  private void jbInit() throws Exception  {    //setIconImage(Toolkit.getDefaultToolkit().createImage(Frame1.class.getResource("[Your Icon]")));    contentPane = (JPanel) this.getContentPane();    button1.setLabel("button1");    gridLayout1.setRows(4);    gridLayout1.setColumns(2);    contentPane.setLayout(gridLayout1);    this.setSize(new Dimension(260, 217));    this.setTitle("GridLayout演示程序");    button2.setLabel("button2");    button3.setLabel("button3");    button4.setLabel("button4");    button5.setLabel("button5");    button6.setLabel("button6");    button7.setLabel("button7");    contentPane.add(button1, null);    contentPane.add(button2, null);    contentPane.add(button3, null);    contentPane.add(button4, null);    contentPane.add(button5, null);    contentPane.add(button6, null);    contentPane.add(button7, null);  }  /**Overridden so we can exit when window is closed*/  protected void processWindowEvent(WindowEvent e) {    super.processWindowEvent(e);    if (e.getID() == WindowEvent.WINDOW_CLOSING) {      System.exit(0);    }  }}