How many swing layouts are there in total?

Swing, as a development tool for creating graphical user interfaces, has a rich layout manager that can help us flexibly organize and arrange components. The following will introduce several commonly used layout managers in swing and provide corresponding code examples.

1. BorderLayout (Border Layout Manager)
   BorderLayout is one of the most commonly used layout managers in swing. It divides the container into five areas: north, south, east, west and center. Can be added to different areas by setting components.

The sample code is as follows:

import javax.swing.*;

public class BorderLayoutExample {
    public static void main(String[] args) {
        JFrame frame = new JFrame("BorderLayout Example");
        frame.setLayout(new BorderLayout());

        JButton btnNorth = new JButton("North");
        JButton btnSouth = new JButton("South");
        JButton btnEast = new JButton("East");
        JButton btnWest = new JButton("West");
        JButton btnCenter = new JButton("Center");

        frame.add(btnNorth, BorderLayout.NORTH);
        frame.add(btnSouth, BorderLayout.SOUTH);
        frame.add(btnEast, BorderLayout.EAST);
        frame.add(btnWest, BorderLayout.WEST);
        frame.add(btnCenter, BorderLayout.CENTER);

        frame.setSize(300, 200);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);
    }
}

2. FlowLayout (Flow Layout Manager)
   FlowLayout arranges the components in the order they are added. If the width of the container is not enough Accommodates all components and will automatically wrap and display.

The sample code is as follows:

import javax.swing.*;

public class FlowLayoutExample {
    public static void main(String[] args) {
        JFrame frame = new JFrame("FlowLayout Example");
        frame.setLayout(new FlowLayout());

        JButton btn1 = new JButton("Button 1");
        JButton btn2 = new JButton("Button 2");
        JButton btn3 = new JButton("Button 3");
        JButton btn4 = new JButton("Button 4");

        frame.add(btn1);
        frame.add(btn2);
        frame.add(btn3);
        frame.add(btn4);

        frame.setSize(300, 200);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);
    }
}

3. GridLayout (Grid Layout Manager)
   GridLayout arranges the components in rows and columns, and all components are equal in size. If When the size of the container changes, the size of the component will be automatically adjusted.

The sample code is as follows:

import javax.swing.*;

public class GridLayoutExample {
    public static void main(String[] args) {
        JFrame frame = new JFrame("GridLayout Example");
        frame.setLayout(new GridLayout(3, 3));

        for (int i = 1; i <= 9; i++) {
            JButton btn = new JButton("Button " + i);
            frame.add(btn);
        }

        frame.setSize(300, 200);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);
    }
}

4. CardLayout (Card Layout Manager)
   CardLayout superimposes multiple components on the same position, by switching different components Display different content, similar to flipping cards.

The sample code is as follows:

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class CardLayoutExample {
    public static void main(String[] args) {
        JFrame frame = new JFrame("CardLayout Example");
        frame.setLayout(new CardLayout());

        JButton btn1 = new JButton("Card 1");
        JButton btn2 = new JButton("Card 2");
        JButton btn3 = new JButton("Card 3");

        frame.add(btn1, "Card 1");
        frame.add(btn2, "Card 2");
        frame.add(btn3, "Card 3");

        btn1.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                CardLayout cl = (CardLayout) frame.getContentPane().getLayout();
                cl.show(frame.getContentPane(), "Card 2");
            }
        });

        btn2.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                CardLayout cl = (CardLayout) frame.getContentPane().getLayout();
                cl.show(frame.getContentPane(), "Card 3");
            }
        });

        btn3.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                CardLayout cl = (CardLayout) frame.getContentPane().getLayout();
                cl.show(frame.getContentPane(), "Card 1");
            }
        });

        frame.setSize(300, 200);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);
    }
}

The above are several layout managers commonly used in swing and corresponding code examples. You can choose the appropriate layout manager to arrange components according to actual needs. . At the same time, we can also customize the layout manager to meet special needs by inheriting from LayoutManager.

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