java - "for"函数对 ArrayList 的操作和异常 java.lang.ArrayIndexOutOfBoundsException

Question

我的代码有问题。我在 ArrayList 上编写了一个简单的操作，但出现了异常。 下面是我的代码:

for (int i=0;i<Core.Config.amountInclu;i++) {
            Random r = new Random();
            x = r.nextInt(this.tabSizeX);
            y = r.nextInt(this.tabSizeY);
                            Pkt nowy = new Pkt(x,y);
                            while(newPkt.contains(nowy) || onBoundary(x,y)==false){

                                x = r.nextInt(this.tabSizeX);
                                y = r.nextInt(this.tabSizeY);
                            }
                            for(int j = 0; j<Core.Config.sizeInclu;j++){
                                for(int k = 0; k<Core.Config.sizeInclu;j++){
                                    if((x+j)<tabSizeX && (y+k)<tabSizeY){
                                        this.P[x+j][y+k].set_black();
                                        newPkt.add(nowy);
                                    }
                                }

                            }

        }

运行此代码后出现异常:

Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException: -2147483648
at growth_1.Plansza.addInclusion(Plansza.java:661)
at growth_1.Display$18.mouseClicked(Display.java:399)
at java.awt.AWTEventMulticaster.mouseClicked(AWTEventMulticaster.java:270)
at java.awt.Component.processMouseEvent(Component.java:6542)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3324)
at java.awt.Component.processEvent(Component.java:6304)
at java.awt.Container.processEvent(Container.java:2239)
at java.awt.Component.dispatchEventImpl(Component.java:4889)
at java.awt.Container.dispatchEventImpl(Container.java:2297)
at java.awt.Component.dispatchEvent(Component.java:4711)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4904)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4544)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4476)
at java.awt.Container.dispatchEventImpl(Container.java:2283)
at java.awt.Window.dispatchEventImpl(Window.java:2746)
at java.awt.Component.dispatchEvent(Component.java:4711)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:760)
at java.awt.EventQueue.access$500(EventQueue.java:97)
at java.awt.EventQueue$3.run(EventQueue.java:709)
at java.awt.EventQueue$3.run(EventQueue.java:703)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:74)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:84)
at java.awt.EventQueue$4.run(EventQueue.java:733)
at java.awt.EventQueue$4.run(EventQueue.java:731)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:74)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:730)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:205)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)

算法非常简单，我们在 JPanel (x,y) 上画一个点并检查它是否已经被使用以及它是否在更大单元格的边界上。如果是的话，我们必须提出另一个观点。 然后我们必须将点和邻近点设置为黑色。 我以为我检查了所有条件以保护点出界。

如果您给我建议，我将非常感激。

Answer 1

我只能假设，这个问题是因为声明中的

for(int k = 0; k<Core.Config.sizeInclu;j++)...

您遇到复制粘贴错误:j++ 而不是 k++