线程“AWT-EventQueue-0”java.lang.IllegalArgumentException中出现异常：比较方法违反了其一般约定

Question

声明:我看到了关于比较函数传递性的帖子，但我不认为我的不好/我不认为它们有错

所以我写了一个兔子和狼的模拟——一开始有一定数量的狼和兔子，兔子从狼身边逃跑，狼追兔子，当它们在同一个街区相遇时，兔子被杀死，当没有兔子时，模拟结束。

对于小电路板，直到大约32x32都可以，但对于64，我在运行时出现以下错误。

此外，这里还有我的3个比较函数：

lBlock是JLabels，野兔/狼/杀手是图标

public  synchronized boolean isEmpty(int x, int y){
    if(!(lBlocks[x][y].getIcon() instanceof Icon)) return true;
    return false;
}


public  synchronized boolean isWolf(int x, int y){
    if(!(lBlocks[x][y].getIcon() instanceof Icon)) return false;
    if(lBlocks[x][y].getIcon().equals(hare)||lBlocks[x][y].getText().equals("h")||isEmpty(x,y)) return false;
    return true;
}

public  synchronized boolean isHare(int x, int y){
    if(!(lBlocks[x][y].getIcon() instanceof Icon)) return false;
    if(isEmpty(x,y)||isWolf(x,y)) return false;
    return true;
}

Exception in thread "AWT-EventQueue-0" java.lang.IllegalArgumentException: Comparison method violates its general contract!
    at java.util.TimSort.mergeLo(TimSort.java:747)
    at java.util.TimSort.mergeAt(TimSort.java:483)
    at java.util.TimSort.mergeCollapse(TimSort.java:410)
    at java.util.TimSort.sort(TimSort.java:214)
    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.getFirstComponent(SortingFocusTraversalPolicy.java:435)
    at javax.swing.LayoutFocusTraversalPolicy.getFirstComponent(LayoutFocusTraversalPolicy.java:166)
    at javax.swing.SortingFocusTraversalPolicy.getDefaultComponent(SortingFocusTraversalPolicy.java:515)
    at javax.swing.SortingFocusTraversalPolicy.getComponentDownCycle(SortingFocusTraversalPolicy.java:204)
    at javax.swing.SortingFocusTraversalPolicy.getFirstComponent(SortingFocusTraversalPolicy.java:447)
    at javax.swing.LayoutFocusTraversalPolicy.getFirstComponent(LayoutFocusTraversalPolicy.java:166)
    at javax.swing.SortingFocusTraversalPolicy.getDefaultComponent(SortingFocusTraversalPolicy.java:515)
    at java.awt.FocusTraversalPolicy.getInitialComponent(FocusTraversalPolicy.java:169)
    at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:380)
    at java.awt.Component.dispatchEventImpl(Component.java:4731)
    at java.awt.Container.dispatchEventImpl(Container.java:2287)
    at java.awt.Window.dispatchEventImpl(Window.java:2719)
    at java.awt.Component.dispatchEvent(Component.java:4687)
    at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:735)
    at java.awt.EventQueue.access$200(EventQueue.java:103)
    at java.awt.EventQueue$3.run(EventQueue.java:694)
    at java.awt.EventQueue$3.run(EventQueue.java:692)
    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:708)
    at java.awt.EventQueue$4.run(EventQueue.java:706)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:705)
    at java.awt.SequencedEvent.dispatch(SequencedEvent.java:128)
    at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:733)
    at java.awt.EventQueue.access$200(EventQueue.java:103)
    at java.awt.EventQueue$3.run(EventQueue.java:694)
    at java.awt.EventQueue$3.run(EventQueue.java:692)
    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:708)
    at java.awt.EventQueue$4.run(EventQueue.java:706)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:705)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
    at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
    at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)

问题是，它并没有做任何事情——代码正在工作，模拟正在进行，但我想修复它。最糟糕的事实是，没有出现错误的行，我有很多.equals（代码总共约400行）-我不知道从哪里找到我的错误：(

编辑：我发现如果板的 x 和 y 都大于 57，则会出现此问题，如果它们较小（或至少其中一个），则不会，哈哈。

Answer 1

快速的解决方案似乎是： System.setProperty（“java.util.Arrays.useLegacyMergeSort”， “true”）;根据这个答案。