java中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
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:
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