MouseAdapter类

当我想使用鼠标适配器类获得鼠标点击计数并出现如下错误时，我遇到了问题：
线程“AWT-EventQueue-0”中的异常java.util.FormatFlagsConversionMismatchException：Conversion = c，Flags =
java.util.Formatter上的$ FormatSpecifier.failMismatch（Unknown Source）java.util.Formatter上的$ FormatSpecifier.checkBadFlags（Unknown Source）$ java.util.Formatter上的$ FormatSpecifier.checkCharacter（Unknown Source）$ FormatSpecifier （Unknown Source）at java.util.Formatter.format（Unknown Source）at java.util.Formatter.format（Unknown Source）at java.util.Formatter.format（Unknown Source）at java.util.Formatter.format（Unknown Source）未知来源）at practice2.window12 $ Mouseclass.mouseClicked（window12.java:20）at java.awt.Component.processMouseEvent（Unknown Source）at java.awt.Component.processEvent（Unknown Source）at java.awt.Container.processEvent （Unknown Source）at java.awt.Window.processEvent（Unknown Source）at java.awt.Component.dispatchEventImpl（Unknown Source）at java.awt.Container.dispatchEventImpl（Unknown Source）at java.awt.Window.dispatchEventImpl（Unknown源）在java.awt.Component.dispatchEvent（未知源）在java.awt.EventQueue.dispatchEventImpl（未知源）在java.awt.E 在java.awt.EventQueue上的$ java.util.EccessQueue $ 3.run（Unknown Source）java.security.AccessController.doPrivileged（Native Method）上的java.security $ 3.run（Unknown Source） .ProtectionDomain $ 1.doIntersectionPrivilege（Unknown Source）at java.security.ProtectionDomain $ 1.doIntersectionPrivilege（Unknown Source）at java.awt.EventQueue $ 4.run（Unknown Source）at java.awt.EventQueue $ 4.run（Unknown Source）at java java.security.ProtectionDomain上的.security.AccessController.doPrivileged（Native方法）位于java.awt.EventDispatchThread.pumpOneEventForFilters（Unknown Source）上的java.awt.EventQueue.dispatchEvent（Unknown Source）上的$ 1.doIntersectionPrivilege（Unknown Source）。在java.awt中的java.awt.EventDispatchThread.pumpEvents（Unknown Source）上的java.awt.EventDispatchThread.pumpEvents（Unknown Source）上的java.awt.EventDispatchThread.pumpEventsForHierarchy（Unknown Source）上的awt.EventDispatchThread.pumpEventsForFilter（Unknown Source） EventDispatchThread.run（未知来源 ）`

package practice2;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class window12 extends JFrame{
    private String details;
    private JLabel statusbar;

    public window12(){
        super("this will be title");
        setVisible(true);
        setSize(400,400);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        statusbar=new JLabel("this will be defalt");
        add(statusbar,BorderLayout.SOUTH);
        addMouseListener(new Mouseclass());
    }
    private class Mouseclass extends MouseAdapter{
        public void mouseClicked(MouseEvent event){
            details=String.format("you clicked %      `enter code here`clicks",event.getClickCount());
            if(event.isMetaDown()){
                details+=" with right button";
            }
            else if(event.isAltDown()){
                details+=" with center button";
            }
            else{
                details+=" with left button";
            }
            statusbar.setText(details);
        }
    }
    public static void main(String[] args){
        new window12();
    }

}

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异常消息是问题的良好指示器 - 您需要使用格式说明符

details = String.format("you clicked %d", event.getClickCount());

阅读javadoc

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这个

details=String.format("you clicked %      `enter code here`clicks",event.getClickCount());

应该

details=String.format("you clicked %d      `enter code here`clicks",event.getClickCount());

注意de％d

---

您缺少格式说明符%d ：

details = String.format("you clicked %d",event.getClickCount();

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