Question

我有一个作业问题，我试图设置GUI并执行以下操作：

  Step 1. Create a random list of 52 elements holding 52 numbers 
           corresponding to 52 cards in the cards folder

   Step 2. Create a JFrame
        2a. set title of your frame
        2b. set layout of your frame to have a GridLayout

   Step 3. Create 3 cards
        3a. create 3 objects of ImageIcon whose image's location is 
            pointing to the image in the cards folder
        3b. create 3 JLabel object, each one hold an ImageIcon object 
            created above

   Step 4. Add three JLabel into your JFrame

   Step 5. Pack and display your frame

我在尝试使GUI可见时遇到了麻烦，并且在理解如何实现ImageIcon方面也遇到了麻烦。我需要做一个网格布局，但是没有一个显示出来。

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

public class Question_2 {

   static String location = "cards/";

   public static void main( String[] args ) {
      String[] cards;
      cards = new String[ 52 ];

      JFrame frmMyWindow = new JFrame( "Random Cards" );
      frmMyWindow.setSize( 300, 200 );
      frmMyWindow.setLocationRelativeTo( null );
      frmMyWindow.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );

      frmMyWindow.setVisible( true );
   }

}

class frmMyWindow extends JFrame {

   JLabel lblName;
   JPanel panelMain, panelLeft, panelCenter, panelRight;
   private int realityState;
   private int commState;

   public frmMyWindow( String Cards ) {
      super( "Cards" );
      realityState = commState = 0;

      lblName = new JLabel( "Cards" );
      panelMain = new JPanel( new GridLayout( 1, 3, 10, 10 ) );
      setLayout( new BorderLayout( 20, 10 ) );

      add( lblName, BorderLayout.NORTH );

      add( panelMain, BorderLayout.CENTER );

      panelLeft = new JPanel( new FlowLayout( FlowLayout.CENTER, 5, 10 ) );
      panelCenter = new JPanel( new FlowLayout( FlowLayout.LEFT, 5, 5 ) );
      panelRight = new JPanel( new FlowLayout( FlowLayout.CENTER, 5, 10 ) );

      panelMain.add( panelLeft );
      panelMain.add( panelCenter );
      panelMain.add( panelRight );

   }

}

我希望代码显示在标题中带有单词Cards的位置，然后显示从Card文件中随机选择的3张卡的网格布局。

Answer 1

一切都很好，只不过您要创建JFrame实例而不是自定义类。

以下行

JFrame frmMyWindow = new JFrame( "Random Cards" );

应该是

JFrame frmMyWindow = new frmMyWindow( "Random Cards" );

为什么我的GUI无法正常工作，我需要可见的代码吗？

1 个答案: