1 import java.awt.BorderLayout; 2 import java.awt.FlowLayout; 3 import java.awt.Font; 4 import java.awt.GridLayout; 5 import javax.swing.JButton; 6 import javax.swing.JFrame; 7 import javax.swing.JLabel; 8  9 public class ShowTest extends JFrame{10     public ShowTest(){11         12     }13     public static void main(String[] args){14         ShowTest task = new ShowTest();15         task.setTitle("TestLayout");16         task.setSize(300, 300);17         task.setLocationRelativeTo(null);18         task.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);19         task.setVisible(true);20         //task.testFlowLayout();21         //task.testGridLayout();22         //task.testBorderLayout();23     }24     public void testFlowLayout()25     {26         //FlowLayout(alignment:int, hap:int, vgap:int)对齐方式，水平间隔，垂直间隔。27         setLayout(new FlowLayout(FlowLayout.LEFT, 10, 20));28         JButton[] jbt = new JButton[9]; 29         for (int i = 0; i < 9; i++) {30             jbt[i] = new JButton("" + i);31             jbt[i].setFont(new Font("SansSerif", Font.BOLD, 20));32             add(jbt[i]);33         }34     }35     public void testGridLayout(){36         setLayout(new GridLayout(3, 3));37         JButton[] jbt = new JButton[8]; 38         for (int i = 0; i < 8; i++) {39             jbt[i] = new JButton("" + i);40             jbt[i].setFont(new Font("SansSerif", Font.BOLD, 20));41             add(jbt[i]);42         }43     }44     public void testBorderLayout(){45         //BorderLayout(hgap:int, vgap:int)指定水平间隔和垂直间隔46         setLayout(new BorderLayout(5, 10));47         add(new JButton("East"), BorderLayout.EAST);48         add(new JButton("South"), BorderLayout.SOUTH);49         add(new JButton("West"), BorderLayout.WEST);50         add(new JButton("North"), BorderLayout.NORTH);51         add(new JButton("Center"), BorderLayout.CENTER);52     }53 }

task.testFlowLayout(); task.testGridLayout(); task.testBorderLayout();