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我试图帮助朋友调试，但我似乎无法找出问题所在。

代码的规格非常明确：

  1. 使用按钮绘制赛道
  2. 使用线程来移动按钮作为 JRacers
  3. 实施 JSpinners 以携带有关 # 圈数和 # 赛车手的信息

出于某种原因，他的程序似乎运行良好，但 Java 仍然向他抛出一个错误，涉及违反合同......

这是错误：

> Exception in thread "AWT-EventQueue-0" java.lang.IllegalArgumentException: Comparison method violates its general contract!
    at java.util.TimSort.mergeHi(TimSort.java:868)
    at java.util.TimSort.mergeAt(TimSort.java:485)
    at java.util.TimSort.mergeForceCollapse(TimSort.java:426)
    at java.util.TimSort.sort(TimSort.java:223)
    at java.util.TimSort.sort(TimSort.java:173)
    at java.util.Arrays.sort(Arrays.java:659)
    at java.util.Collections.sort(Collections.java:217)
    at javax.swing.SortingFocusTraversalPolicy.enumerateAndSortCycle(SortingFocusTraversalPolicy.java:136)
    at javax.swing.SortingFocusTraversalPolicy.getFocusTraversalCycle(SortingFocusTraversalPolicy.java:110)
    at javax.swing.SortingFocusTraversalPolicy.getComponentAfter(SortingFocusTraversalPolicy.java:280)
    at javax.swing.LayoutFocusTraversalPolicy.getComponentAfter(LayoutFocusTraversalPolicy.java:106)
    at javax.swing.plaf.basic.BasicSpinnerUI$ArrowButtonHandler.focusSpinnerIfNecessary(BasicSpinnerUI.java:812)
    at javax.swing.plaf.basic.BasicSpinnerUI$ArrowButtonHandler.mousePressed(BasicSpinnerUI.java:770)
    at java.awt.AWTEventMulticaster.mousePressed(AWTEventMulticaster.java:280)
    at java.awt.Component.processMouseEvent(Component.java:6502)
    at javax.swing.JComponent.processMouseEvent(JComponent.java:3321)
    at java.awt.Component.processEvent(Component.java:6270)
    at java.awt.Container.processEvent(Container.java:2229)
    at java.awt.Component.dispatchEventImpl(Component.java:4861)
    at java.awt.Container.dispatchEventImpl(Container.java:2287)
    at java.awt.Component.dispatchEvent(Component.java:4687)
    at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4832)
    at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4489)
    at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4422)
    at java.awt.Container.dispatchEventImpl(Container.java:2273)
    at java.awt.Window.dispatchEventImpl(Window.java:2719)
    at java.awt.Component.dispatchEvent(Component.java:4687)
    at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:723)
    at java.awt.EventQueue.access$200(EventQueue.java:103)
    at java.awt.EventQueue$3.run(EventQueue.java:682)
    at java.awt.EventQueue$3.run(EventQueue.java:680)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87)
    at java.awt.EventQueue$4.run(EventQueue.java:696)
    at java.awt.EventQueue$4.run(EventQueue.java:694)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:693)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:244)
    at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:163)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:151)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:147)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:139)
    at java.awt.EventDispatchThread.run(EventDispatchThread.java:97)

这是代码：

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.event.*;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.*;
import javax.swing.JPanel;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;

class CntlPanel extends JPanel implements ChangeListener
{
    static JSpinner tempjs;
    static JSpinner js = new JSpinner();
    static JLabel jl = new JLabel();
    static JSpinner js2 = new JSpinner();
    static JLabel jl2 = new JLabel();
    static JButton start = new JButton();
    static JButton set = new JButton();
    public CntlPanel()        
    {
        setSize(150,125); 
        setBackground(Color.LIGHT_GRAY);
        setLocation(425,230);
    }
    public void buttonset(int next)
    {
        if (next == 0)
        {
            js2.setPreferredSize(new Dimension(45,25));
            jl2.setPreferredSize(new Dimension(50,25));    
            js.setPreferredSize(new Dimension(45,25));
            jl.setPreferredSize(new Dimension(50,25));
            set.setPreferredSize(new Dimension(100,35));

            jl.setText("Racers");
            set.setText("Set Racers");
            js.setValue(1);

            jl2.setText("Laps");
            js2.setValue(1);

            js.addChangeListener(this);
            js2.addChangeListener(this);
            add(js);
            add(jl);   
            add(js2);
            add(jl2);
            add(set);
        }
        if (next == 1)
        {
            JLabel jl1 = new JLabel();
            jl1.setPreferredSize(new Dimension(50,25));
            System.out.print("Bye");
            start.setPreferredSize(new Dimension(100,35));
            start.setText("START");
            add(jl1);
            add(start);
        }
    }

    @Override
    public void stateChanged(ChangeEvent e)
    {
        if (e.getSource()== js) 
        { 
            if ((int)js.getValue() < 1)
            {
                js.setValue(1);
            }
            if ((int)js.getValue() > 4)
            {
                js.setValue(4);
            }
        }

        if (e.getSource() == js2)
        { 
            if ((int)js2.getValue() < 1)
            {
                js2.setValue(1);
            } 
        }
    }
}

我已经能够确定：

  1. 合同错误涉及比较方法的非传递性
  2. 他从不编辑或弄乱比较方法......我质疑使用 == 比较某些对象是否有问题，但在切换到 .equals() 表示法后，错误仍然存​​在

我对如何调试这个很迷茫。

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0 回答 0