显示带有两个面板的GUI，包括每个面板的三个按钮

Question

我需要设计方面的帮助，并实现具有多个动作组件的基本GUI。目标是创建两个面板和六个按钮。每个面板有三个按钮。

到目前为止，我在Java虚拟机中编码。我的代码似乎很正确，但输出不显示按钮。你能帮忙找出按钮没有显示的原因吗？

顺便说一句，我有一张照片。我希望我的设计像这样。

http://i1199.photobucket.com/albums/aa467/Jordan_Sanjaya/Picture1.png

我的代码：

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

public class FlowlayoutExperiment extends JFrame {

    FlowLayout experimentLayout = new FlowLayout();

    private JButton firstButton = new JButton("Button 1");
    private JButton secondButton = new JButton("Button 2");
    private JButton thirdButton = new JButton("Button 3");
    private JButton fourthButton = new JButton("Button 4");
    private JButton fifthButton = new JButton("Button 5");
    private JButton sixthButton = new JButton("Button 6");

    public FlowlayoutExperiment ()
    {

        JPanel group1 = new JPanel();
        setLayout(new GridLayout(3,1));

        group1.add(firstButton);
        group1.add(secondButton);
        group1.add(thirdButton);        

        JPanel group2 = new JPanel();
        setLayout(new GridLayout(3,1));
        group2.add(fourthButton);
        group2.add(fifthButton);
        group2.add(sixthButton);

         }
   public static void main(String[] args) 
   {

        FlowlayoutExperiment frame = new FlowlayoutExperiment();
        frame.setTitle("Button Panel Example");
        frame.setSize(600, 75);
        frame.setLocationRelativeTo(null);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);

    }
}

Answer 1

您好像忘记将群组添加到任何内容

public FlowlayoutExperiment ()
{

    JPanel group1 = new JPanel();
    setLayout(new GridLayout(3,1));

    group1.add(firstButton);
    group1.add(secondButton);
    group1.add(thirdButton);        

    JPanel group2 = new JPanel();
    setLayout(new GridLayout(3,1));
    group2.add(fourthButton);
    group2.add(fifthButton);
    group2.add(sixthButton);

    // This is important ;)
    add(group1);
    add(group2);

 }

您还要设置框架的布局而不是组

你可能想要改变......

    JPanel group1 = new JPanel();
    setLayout(new GridLayout(3,1));
    //...
    JPanel group2 = new JPanel();
    setLayout(new GridLayout(3,1));

要

    JPanel group1 = new JPanel();
    group1.setLayout(new GridLayout(3,1));
    //...
    JPanel group2 = new JPanel();
    group2.setLayout(new GridLayout(3,1));

Answer 2

按钮未显示。这是因为您没有将2个JPanel添加到Frame。

您可以向构造函数FlowlayoutExperiment添加2行代码。它会使按钮显示出来。    的 this.getContentPane（）添加（组1）;

<强> this.getContentPane（）添加（组2）;

public FlowlayoutExperiment() {

    JPanel group1 = new JPanel();
    setLayout(new GridLayout(3, 1));

    group1.add(firstButton);
    group1.add(secondButton);
    group1.add(thirdButton);

    JPanel group2 = new JPanel();
    setLayout(new GridLayout(3, 1));
    group2.add(fourthButton);
    group2.add(fifthButton);
    group2.add(sixthButton);

    this.getContentPane().add(group1);
    this.getContentPane().add(group2);

}