swing之flowlayout

import java.awt.FlowLayout;

import javax.swing.JButton;
import javax.swing.JFrame;
//1.继承 JFrame类
//2.在最上方定义组件
//3.在构造方法中创建组件
//4、在构造方法中添加组件
//5.设置窗体属性
//6.显示窗体
//7.在主函数中创建对象

public class flowlayout1 extends JFrame{
   JButton [] a={null,null,null,null,null,null,null,null};
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        flowlayout1 f1=new flowlayout1();
    }

    public flowlayout1 ()
      {
        a[]=new JButton("瓜子");
        a[]=new JButton("话梅");
        a[]=new JButton("西瓜");
        a[]=new JButton("草莓");
        a[]=new JButton("香蕉");
        a[]=new JButton("苹果");
        a[]=new JButton("栗子");
        a[]=new JButton("黄瓜");
        //a[8]=new JButton("葡萄");

        this.setLayout(new FlowLayout(FlowLayout.LEADING));//默认是边界布局，如果想变成其他布局，加上

        this.add(a[]);
        this.add(a[]);
        this.add(a[]);
        this.add(a[]);
        this.add(a[]);
        this.add(a[]);
        this.add(a[]);
        this.add(a[]);

        this.setTitle("流式布局flowlayout");
        this.setSize(,);
        this.setLocation(, );
        this.setResizable(true);
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        this.setVisible(true);

      }
}