//导入Java类

import javax.swing.*;

import java.awt.*;

public class Demo extends JFrame{

    public Demo(){

        setBounds(100,100,500,300);

        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

        Container c=getContentPane();

        c.setLayout(new GridLayout(2,2));

//创建新的组件   JPanel面板

        JPanel p1=new JPanel(new GridLayout(1,3,10,10));//布局可写在组件内

        //p1.setLayout(new GridLayout(1,3,10,10));

        JPanel p2=new JPanel(new BorderLayout());

        JPanel p3=new JPanel(new GridLayout(1,2,10,10));

        JPanel p4=new JPanel(new GridLayout(2,1,10,10));

        //给每个面板设置边框

        p1.setBorder(BorderFactory.createTitledBorder("面板1"));//设置面板

        p2.setBorder(BorderFactory.createTitledBorder("面板2"));

        p3.setBorder(BorderFactory.createTitledBorder("面板3"));

        p4.setBorder(BorderFactory.createTitledBorder("面板4"));

        //给每个面板添加JButton组件

        //设置四个按钮的原因：我们网格布局是1，3 网格布局的优势：多添加或少添加组件行不变，列变

        p1.add(new JButton("p1"));

        p1.add(new JButton("p1"));

        p1.add(new JButton("p1"));

        p1.add(new JButton("p1"));

        p2.add(new JButton("p2"),BorderLayout.CENTER);

        p2.add(new JButton("p2"),BorderLayout.EAST);

        p2.add(new JButton("p2"),BorderLayout.WEST);

        p2.add(new JButton("p2"),BorderLayout.SOUTH);

        p2.add(new JButton("p2"),BorderLayout.NORTH);

        p3.add(new JButton("p3")); p3.add(new JButton("p3"));

        p4.add(new JButton("p4")); p4.add(new JButton("p4"));

        //可设置美观的  例如背景颜色

       p4.setBackground(Color.BLUE);
       c.add(p1);c.add(p2);c.add(p3);c.add(p4);

       setVisible(true);

    }

    public static void main(String[] args) {

        new Demo();

    }

}

//导入Java类

import javax.swing.*;

import java.awt.*;

public class Demo extends JFrame{

    public Demo(){

        setBounds(100,100,100,150);

        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

        Container c=getContentPane();

        JTextArea t=new JTextArea();//创建文本域

        JScrollPane s=new JScrollPane(t);//创建滚动面板  将t(文本域添加到组建中)

        c.add(s);//将滚动面板添加到容器中

        setVisible(true);

    }

public static void main(String[] args) {

        new Demo();

   }
}