flowlayoutframe.java

Eclipse程序设计经典教程+源代码 学习java的朋友可以看看

package layout;

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

public class FlowLayoutFrame extends JFrame {
  JPanel contentPane;
  //创建FlowLayout布局
  FlowLayout flowLayout1 = new FlowLayout();
  //创建15个按钮
  JButton[] jButtons = new JButton[15];

  public FlowLayoutFrame() {
    try {
      //窗口关闭时清空内存
      setDefaultCloseOperation(EXIT_ON_CLOSE);
      jbInit();
    }
    catch(Exception e) {
      e.printStackTrace();
    }
  }

  public static void main(String[] args) {
    FlowLayoutFrame frame = new FlowLayoutFrame();
    Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
    Dimension frameSize = frame.getSize();
    //居中对齐
    frame.setLocation((screenSize.width - frameSize.width) / 2,
        (screenSize.height - frameSize.height) / 2);
    frame.setVisible(true);
  }
  
  private void jbInit() throws Exception  {
    contentPane = (JPanel) this.getContentPane();
    contentPane.setLayout(flowLayout1);
    this.setSize(new Dimension(400, 300));
    this.setTitle("FlowLayout示例");
    //设置布局的空隙属性
    flowLayout1.setHgap(10);
    flowLayout1.setVgap(10);
    //设置布局的对齐方式
    flowLayout1.setAlignment(FlowLayout.LEADING);
    //设置按钮属性和加入按钮
    for (int i = 0; i < jButtons.length; i++) {
      //创建按钮
      jButtons[i] = new JButton();
      //设置按钮的属性
      jButtons[i].setText("按钮" + (i + 1));
      //向面板容器加入各个按钮
      contentPane.add(jButtons[i], null);
    }
    //设置按钮大小属性
    jButtons[3].setPreferredSize(new Dimension(80, 40));
  }
}