gridlayoutdemo.java

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// 例6.4.4 GridLayoutDemo.java
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class GridLayoutDemo
{
	private JFrame jframe;
	private JPanel jp1,jp2;
	private JTextField jtf;
	private JButton jb1,jb2;
	public GridLayoutDemo()
{
		jframe = new JFrame("GridLayout演示窗口");
		Container c = jframe.getContentPane();
		
// 创建一个文本框，放置到窗体的北部
		jtf = new JTextField();
		c.add(jtf,BorderLayout.NORTH);

		// 创建一个中间容器，使用GridLayout布局，放置16个按钮组件
		jp1 = new JPanel(new GridLayout(4,4));
		String btnStr = "789/456*123-0.+=";
		for (int i=0;i<btnStr.length();i++)
			jp1.add(new JButton(btnStr.substring(i,i+1)));

		c.add(jp1,BorderLayout.CENTER);  // 将中间容器放置在窗体中部
		// 创建另一个中间容器，使用FlowLayout布局，放置两个按钮组件
		jp2 = new JPanel();
		jb1 = new JButton("BACKSPACE");
		jb2 = new JButton("CLEAR");
		jp2.add(jb1);jp2.add(jb2);
		c.add(jp2,BorderLayout.SOUTH);  // 将中间容器放置在窗体南部
		
		jframe.pack();
		jframe.setVisible(true);
		jframe.addWindowListener(new WindowAdapter(){
			public void windowClosing(WindowEvent e){
				System.exit(0);	
			}	
		});
	}
	public static void main(String[] args)
{
		new GridLayoutDemo();
	}
}