java/54_Flow Layout at main · PeiHui369/java · GitHub

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//Layout Manager = Defines the natural layout for components within a container
//3 common managers
//FlowLayout = places components in a row, sized at their preferred size.
//             If the horizontal space in the container is too small.
//             the FlowLayout class uses the next available row

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

public class Main{
    public static void main(String[] args){
        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(500,500);
        frame.setLayout(new FlowLayout(FlowLayout.CENTER,10,10));//LEADING(left), CENTER(default), TRAILING(Right); hgap, vgap

        JPanel panel = new JPanel();
        panel.setPreferredSize(new Dimension(100,250));
        panel.setBackground(Color.lightGray);
        panel.setLayout(new FlowLayout()); //default alr have

        panel.add(new JButton("1"));
        panel.add(new JButton("2"));
        panel.add(new JButton("3"));
        panel.add(new JButton("4"));
        panel.add(new JButton("5"));
        panel.add(new JButton("6"));
        panel.add(new JButton("7"));
        panel.add(new JButton("8"));
        panel.add(new JButton("9"));

        frame.setVisible(true); //after button->so can directly show


    }
}