Swing不尊重我的GridLayout Rows x Columns定义.怎么修？

Question

我一直试图解决这个问题但没有成功.如何JPanel p尊重定义GridLayout？我得到的是第一行包含3个面板,但不是4,因为我告诉Java要执行.

什么是必要的伏都教(或我的无知的知识),使它工作？

package temp2;

import java.awt.Dimension;
import java.awt.GridLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;


public class Temp2 {

    public static void main(String[] args) {

        JFrame f = new JFrame();
        JPanel p = new JPanel();  
    //  GridLayout flow = new GridLayout(1, 5); --> With this I get a row with 5 jpanels
        GridLayout flow = new GridLayout(2, 4); // --> Why it doenst work? I want 4 
                                                // jpanels in the first row and 
                                                // subsequent one on the next row
                                                // --> Why it doesnt respect my code?
        p.setLayout(flow);
      // p.setSize(800,800); // --> This doesnt make any difference on final result either
      //  p.setPreferredSize(new Dimension(800,800));  // --> This doesnt make any
                                                      // difference on final result either
        p.setMinimumSize(new Dimension(800,800));

        JPanel x1 = new JPanel();     
        x1.setPreferredSize(new Dimension(50,30)); // --> It doesnt respect these preferences
        x1.setMaximumSize(new Dimension(50,30)); // --> It doesnt respect this maximum
        x1.setBorder(javax.swing.BorderFactory.createEtchedBorder());

        JPanel x2 = new JPanel();       
        x2.setPreferredSize(new Dimension(50,30)); // --> It doesnt respect these preferences
        x2.setMaximumSize(new Dimension(50,30)); // --> It doesnt respect this maximum
        x2.setBorder(javax.swing.BorderFactory.createEtchedBorder());

        JPanel x3 = new JPanel();      
        x3.setPreferredSize(new Dimension(50,30)); // --> It doesnt respect these preferences
        x3.setMaximumSize(new Dimension(50,30)); // --> It doesnt respect this maximum
        x3.setBorder(javax.swing.BorderFactory.createEtchedBorder());

        JPanel x4 = new JPanel();      
        x4.setPreferredSize(new Dimension(50,30)); // --> It doesnt respect these preferences
        x4.setMaximumSize(new Dimension(50,30));  // --> It doesnt respect this maximum      
        x4.setBorder(javax.swing.BorderFactory.createEtchedBorder());

        JPanel x5 = new JPanel();       
        x4.setMaximumSize(new Dimension(50,30)); // --> It doesnt respect these preferences
        x5.setPreferredSize(new Dimension(50,30)); // --> It doesnt respect this maximum 
        x5.setBorder(javax.swing.BorderFactory.createEtchedBorder());

         p.add(x1);
         p.add(x2);
         p.add(x3);
         p.add(x4);
         p.add(x5);

         f.getContentPane().add(p, "Center");

         f.setSize(800, 800);
         f.setVisible(true);
         p.updateUI();

        }   
    }

因为这是我的第一个StackOverflow问题,所以我试图严格遵守规则:

具体一点:我想GridLayout尊重行x列的定义

我的最终目的是:在第一行显示4个面板,在第二行显示后续的面板.

让它与其他人相关:这就是为什么这段代码是教学的,重复所有的面板声明,所以新手(和我)可以理解所有的代码并专注于这个GridLayout问题.

Answer 1

    GridLayout flow = new GridLayout(2, 4); // --> Why it doenst work? I want 4 
                                            // jpanels in the first row and 
                                            // subsequent one on the next row
                                            // --> Why it doesnt respect my code?

像这样？

改为使用:

    GridLayout flow = new GridLayout(0,4);

引用构造函数的文档:

创建具有指定行数和列数的网格布局.布局中的所有组件都具有相同的大小.

行和列中的一个(但不是两个)可以为零,这意味着可以将任意数量的对象放置在行或列中.