Example: Demonstrates nesting using Swing layout

Nested Swing layout example

Swing is a very popular Java interface development toolkit, which provides a series of layout managers for graphical Design and build the layout of components in user interfaces. This article will introduce an example of nested layout using Swing layout manager.

In Swing, you can use a variety of layout managers to achieve different layout effects, such as BorderLayout, FlowLayout, GridLayout, etc. In order to implement nested layout, we can use multiple layout managers within a container to achieve complex interface layout. The following is a sample code to show how to use the Swing layout manager for nested layout:

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

public class NestedLayoutExample extends JFrame {
    public NestedLayoutExample() {
        // 设置窗口标题
        setTitle("嵌套布局示例");

        // 创建容器
        Container container = getContentPane();

        // 创建顶层布局
        BorderLayout borderLayout = new BorderLayout();
        container.setLayout(borderLayout);

        // 创建 North 区域的组件
        JLabel northLabel = new JLabel("North 区域");
        northLabel.setHorizontalAlignment(JLabel.CENTER);
        container.add(northLabel, BorderLayout.NORTH);

        // 创建 South 区域的组件
        JPanel southPanel = new JPanel();
        FlowLayout flowLayout = new FlowLayout();
        southPanel.setLayout(flowLayout);
        JButton southButton1 = new JButton("Button1");
        JButton southButton2 = new JButton("Button2");
        southPanel.add(southButton1);
        southPanel.add(southButton2);
        container.add(southPanel, BorderLayout.SOUTH);

        // 创建 Center 区域的组件
        JPanel centerPanel = new JPanel();
        GridLayout gridLayout = new GridLayout(2, 2);
        centerPanel.setLayout(gridLayout);
        JButton centerButton1 = new JButton("Button1");
        JButton centerButton2 = new JButton("Button2");
        JButton centerButton3 = new JButton("Button3");
        JButton centerButton4 = new JButton("Button4");
        centerPanel.add(centerButton1);
        centerPanel.add(centerButton2);
        centerPanel.add(centerButton3);
        centerPanel.add(centerButton4);
        container.add(centerPanel, BorderLayout.CENTER);

        // 设置窗口大小、位置和可见性
        setSize(400, 300);
        setLocationRelativeTo(null);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setVisible(true);
    }

    public static void main(String[] args) {
        // 创建 NestedLayoutExample 对象
        new NestedLayoutExample();
    }
}

In the above sample code, we use BorderLayout as the top-level layout manager and set the container to the BorderLayout layout . We then add a center-aligned label to the North area and a FlowLayout panel with two buttons to the South area. Finally, add a GridLayout layout panel in the Center area, which contains four buttons.

Run the above code and you will see a window with a label at the top of the window, two buttons at the bottom, and a 2x2 button grid in the middle.

Summary:

In this article, we demonstrated how to use Swing's layout manager for nested layouts. By using different layout managers in a container, we can achieve flexible and diverse interface layouts. You can use different layout managers according to your needs and design various complex interface layouts by adjusting the size and position of components. I hope this article will help you understand the nested use of Swing layout.

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