GUI布局：边界布局、流式布局、网格布局、卡片布局

边界布局

package guiTest;
//JFrame默认的是边界布局BorderLayout
import java.awt.BorderLayout;

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

public class BorderLayoutDemo {
	public static void main(String[] args) {
		JFrame f = new JFrame("边界布局BorderLayout");
		//JFrame的默认LayoutManager为BorderLayout
	//	f.setLayout(new BorderLayout());//可以不写，默认的就是流式布局
		JButton btn =  new JButton("北");
		f.add(btn,BorderLayout.NORTH);

		btn=new JButton("南");
		f.add(btn,BorderLayout.SOUTH);

		btn=new JButton("东");
		f.add(btn,BorderLayout.EAST);

		btn=new JButton("西");
		f.add(btn,BorderLayout.WEST);

		btn=new JButton("中");
		f.add(btn,BorderLayout.CENTER);

		f.pack();//也可以用f.setSize(222,222);来进行设置
		f.setVisible(true);
		f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	}

}

流式布局

package guiTest;

import java.awt.BorderLayout;
import java.awt.CardLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;

public class CardLayoutDemo {
	private static JPanel p;
	public static void main(String[] args) {
		JFrame f = new JFrame("卡片布局CardLayout");
		p=new JPanel();
		//设置p的布局管理器为卡片布局CardLayout
		p.setLayout(new CardLayout());

		//新建两个JPanel
		JPanel p1 = new JPanel();
		JPanel p2 = new JPanel();
		JLabel lb = new JLabel("第一个面板");
		p1.add(lb);//面板里面加标签
		lb=new JLabel("第二个面板");
		p2.add(lb);//面板里面加标签

		//将新建的两个JPanel面板添加到p中
		p.add(p1,"first");
		p.add(p2,"second");

		//设置默认显示first所对应的JPanel p1
		((CardLayout)p.getLayout()).show(p,"first");

		JButton btn = new JButton("改变面板");
		btn.addActionListener(new ActionListener() {

			@Override
			public void actionPerformed(ActionEvent e) {
				// TODO Auto-generated method stub
				//当点击'改变面板'时，显示second对应的JPanel p2
				((CardLayout)p.getLayout()).show(p,"second");
			}
		});
		f.add(btn,BorderLayout.NORTH);
		f.add(p,BorderLayout.CENTER);
		f.setSize(400,150);//f.pack();

		f.setVisible(true);
		f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	}

}

网格布局

package guiTest;

import java.awt.FlowLayout;

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

public class FlowLayoutDemo {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		JFrame f = new JFrame("流式布局FlowLayout");
		f.setLayout(new FlowLayout());
		for(int i=0;i<7;i++)
		{
			JButton btn=new JButton("Button"+i);
			f.add(btn);
		}
		f.setSize(300,250);
		//f.pack();默认边框设置宽度和长度刚刚好的样子
		f.setVisible(true);
		f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

	}

}

卡片布局

package guiTest;

import java.awt.GridLayout;

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

public class GirdLayoutDemo {

	public static void main(String[] args) {
		JFrame f = new JFrame("网格布局GirdLayout");
		//设置f的布局管理器为3行3列的GirdLayout组件间水平与垂直间距为5
		f.setLayout(new GridLayout(3,3,5,5));
		for(int i=1;i<10;++i)
		{
			JButton btn = new JButton(String.valueOf(i));
			f.add(btn);
		}
		f.pack();
		f.setVisible(true);
		f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

	}

}