Java swing五种常见的布局方式

1、 边界布局（BorderLayout）
2、流式布局（FlowLayout）
3、网格布局（GridLayout）
4、盒子布局（BoxLaYout）
5、空布局（null）

还有其他两种布局，分别是GridBagLayout（网格包布局）、CardLayout（卡片布局）

注意：JFrame和JDialog默认布局为BorderLayout，JPanel和Applet默认布局为FlowLayout

标题边界布局示例代码：

import java.awt.BorderLayout;
 
import javax.swing.JButton;
import javax.swing.JFrame;
 
public class BorderLayoutExample extends JFrame{
  JButton btn1=new JButton("东");
  JButton btn2=new JButton("南");
  JButton btn3=new JButton("西");
  JButton btn4=new JButton("北");
  JButton btn5=new JButton("中");
  BorderLayoutExample(){
    init();
    this.setTitle("边界布局");
    this.setResizable(true);
    this.setSize(200, 200);
    this.setLocationRelativeTo(null);
    this.setDefaultCloseOperation(EXIT_ON_CLOSE);
    this.setVisible(true);
  }
  void init(){
    this.setLayout(new BorderLayout(10,5)); //默认为0，0；水平间距10，垂直间距5
    this.add(btn1,BorderLayout.EAST);
    this.add(btn2,BorderLayout.SOUTH);
    this.add(btn3,BorderLayout.WEST);
    this.add(btn4,BorderLayout.NORTH);
    this.add(btn5,BorderLayout.CENTER);
  }
  public static void main(String args[]){
    new BorderLayoutExample();
  }
}

运行结果：

流式布局示例代码：

import java.awt.FlowLayout;
 
import javax.swing.JButton;
import javax.swing.JFrame;
 
public class FlowLayoutExample extends JFrame{
  JButton btn1=new JButton("one");
  JButton btn2=new JButton("two");
  JButton btn3=new JButton("three");
  JButton btn4=new JButton("four");
  JButton btn5=new JButton("five");
  FlowLayoutExample(){
    init();
    this.setTitle("流式布局");
    this.setResizable(true);
    this.setSize(200, 200);
    this.setLocationRelativeTo(null);
    this.setDefaultCloseOperation(EXIT_ON_CLOSE);
    this.setVisible(true);
  }
  void init(){
    this.setLayout(new FlowLayout(FlowLayout.LEFT,10,5)); //默认为居中;水平间距10，垂直间距5
    this.add(btn1);
    this.add(btn2);
    this.add(btn3);
    this.add(btn4);
    this.add(btn5);
  }
  public static void main(String args[]){
    new FlowLayoutExample();
  }
}

运行结果：

网格布局示例代码：

import java.awt.GridLayout;
 
import javax.swing.JButton;
import javax.swing.JFrame;
 
public class GridLayoutExample extends JFrame{
    JButton btn1=new JButton("one");
    JButton btn2=new JButton("two");
    JButton btn3=new JButton("three");
    JButton btn4=new JButton("four");
    JButton btn5=new JButton("five");
    GridLayoutExample(){
        init();
        this.setTitle("表格布局");
        this.setResizable(true);
        this.setSize(300, 200);
        this.setLocationRelativeTo(null);
        this.setDefaultCloseOperation(EXIT_ON_CLOSE);
        this.setVisible(true);
    }
    void init(){
        this.setLayout(new GridLayout(2,3,10,5)); //默认为1行，n列；2行3列，水平间距10，垂直间距5
        this.add(btn1);
        this.add(btn2);
        this.add(btn3);
        this.add(btn4);
        this.add(btn5);
    }
    public static void main(String args[]){
        new GridLayoutExample();
    }
}

运行结果：

盒子布局示例代码：

import javax.swing.Box;
import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
 
public class BoxLaYoutExample extends JFrame{
    JButton btn1=new JButton("one");
    JButton btn2=new JButton("two");
    JButton btn3=new JButton("three");
    JButton btn4=new JButton("four");
    JButton btn5=new JButton("five");
    BoxLaYoutExample(){
        init();
        this.setTitle("表格布局");
        this.setResizable(true);
        this.setSize(300, 200);
        this.setLocationRelativeTo(null);
        this.setDefaultCloseOperation(EXIT_ON_CLOSE);
        this.setVisible(true);
    }
    void init(){
        this.setLayout(new BoxLayout(this.getContentPane(),BoxLayout.X_AXIS));
        //可以使用Box容器代替
        //Box box = new Box(BoxLayout.Y_AXIS);box.add(btn...);box.add(creat..);
        this.add(btn1);
        this.add(btn2);
        this.getContentPane().add(Box.createHorizontalStrut(10)); //采用x布局时，添加固定宽度组件隔开
        //this.getContentPane().add(Box.createVerticalStrut(5)); //采用y布局时，添加固定高度组件隔开
        this.add(btn3);
        this.add(btn4);
        this.add(btn5);
    }
    public static void main(String args[]){
        new BoxLaYoutExample();
    }
}

运行结果：

空布局示例代码：

import javax.swing.JButton;
import javax.swing.JFrame;
 
public class NullLayoutExample extends JFrame{
    JButton btn1=new JButton("one");
    JButton btn2=new JButton("two");
    JButton btn3=new JButton("three");
    JButton btn4=new JButton("four");
    JButton btn5=new JButton("five");
    NullLayoutExample(){
        init();
        this.setTitle("空布局");
        this.setResizable(true);
        this.setSize(300, 300);
        this.setLocationRelativeTo(null);
        this.setDefaultCloseOperation(EXIT_ON_CLOSE);
        this.setVisible(true);
    }
    void init(){
        this.setLayout(null);
        btn1.setBounds(10, 0, 100, 50); //x坐标10，y坐标0，组件宽100，高50
        btn2.setBounds(20, 50, 100, 50);
        btn3.setBounds(30, 100, 100, 50);
        btn4.setBounds(40, 150, 100, 50);
        btn5.setBounds(50, 200, 100, 50);
        this.add(btn1);
        this.add(btn2);
        this.add(btn3);
        this.add(btn4);
        this.add(btn5);
    }
    public static void main(String args[]){
        new NullLayoutExample();
    }
}

运行结果：