字符串的小错误导致程序运行失败

最新推荐文章于 2025-05-17 00:44:57 发布

原创最新推荐文章于 2025-05-17 00:44:57 发布 · 944 阅读

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#import #string #class #c

本文介绍了一个使用Java Swing的CardLayout实现简单卡片切换效果的示例程序。通过两个按钮控制不同面板的显示与隐藏，演示了如何在GUI应用中进行界面元素的动态管理。

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

public class CardLayoutFrame extends JFrame{
    JButton btPrevious = new JButton("Previous");
    JButton btNext = new JButton("Next");
    JPanel flowpanel = new JPanel(new FlowLayout());
    JPanel cardpanel = new JPanel(new CardLayout());
    int currentindex = 0;

   public CardLayoutFrame(){
        this.getContentPane().add(flowpanel,BorderLayout.SOUTH);
        this.getContentPane().add(cardpanel,BorderLayout.CENTER);
       cardpanel.add(getCard(1),"Card1");//"Card 1"多一个空格
       cardpanel.add(getCard(2),"Card2");//"Card 2"这两处错误导致了程序失败
       flowpanel.add(btPrevious);
      flowpanel.add(btNext);
       ActionListener listener = new ActionListener(){
          public void actionPerformed(ActionEvent e){
           swithCard();
          }
      };
      btPrevious.addActionListener(listener);
       btNext.addActionListener(listener);

      this.setSize(300,300);
       this.setTitle("test cardlayout");
      this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      this.show();
       }

      JPanel getCard(int index){
         JPanel panel = new JPanel(new BorderLayout());
         JLabel label = new JLabel("<HTML><h1 style = color:red>"+"this is Panel"+index+"</hl></HTML>");
        label.setHorizontalAlignment(JLabel.CENTER);
        panel.add(label);
        return panel;
        }

  void swithCard(){
      CardLayout c1 = (CardLayout)cardpanel.getLayout();
     if (currentindex==0){
      currentindex++;
     c1.show(cardpanel,"Card1");
      }
    else{
     currentindex--;
     c1.show(cardpanel,"Card2");
     }
   }

   public static void main(String[] args){
       CardLayoutFrame frame = new CardLayoutFrame();
        }
}