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继承、封装、多态、

 

 

 

 

 

 

 

 

 

 

面板

import javax.swing.*;
import java.awt.*;

public class Jpanel extends JFrame {
    public Jpanel() {
        Container container = this.getContentPane();
        container.setLayout(new GridLayout(2,1,10,10));//later function is intended

        JPanel panel = new JPanel(new GridLayout(1,3));
        JPanel panel2 = new JPanel(new GridLayout(1,3));
        JPanel panel3 = new JPanel(new GridLayout(1,3));
        JPanel panel4 = new JPanel(new GridLayout(1,3));

        panel.add(new Button("1"));
        panel.add(new Button("1"));
        panel.add(new Button("1"));
        container.add(panel);

        this.setVisible(true);
        this.setSize(500,500);
        this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

        
    }

    public static void main(String[] args) {
        new Jpanel();

    }
}

JScrollPanel

import javax.swing.*;
import java.awt.*;

public class JScorllDemo extends JFrame {
    public JScorllDemo()  {
        Container container = this.getContentPane();
        //TextArea
        JTextArea textArea = new JTextArea(20,50);
        textArea.setText("welcome to kuangshen java");
        container.add(textArea);
        //Scroll  Panel
        JScrollPane scrollPane = new JScrollPane(textArea);
        container.add(scrollPane);



        this.setVisible(true);
        this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        this.setBounds(100,100,300,300);


    }

    public static void main(String[] args) {

        new JScorllDemo();
    }

}