我刚刚在我的小程序中将我所有的数组移植到 ArrayList (由于我对 Java 非常缺乏知识,我不知道基本的数组类型没有任何“.add”选项),一切看起来都很好......除了不时抛出异常,但它自相矛盾:
Exception in thread "AWT-EventQueue-0" java.lang.IndexOutOfBoundsException: Index: 17, Size: 21
at java.util.ArrayList.rangeCheck(ArrayList.java:604)
at java.util.ArrayList.get(ArrayList.java:382)
at guay.Puntitos.AumentarTamano(Puntitos.java:346)
at guay.Guay$MiMouse.mouseMoved(Guay.java:226)
at java.awt.Component.processMouseMotionEvent(Component.java:6550)
at java.awt.Component.processEvent(Component.java:6274)
at java.awt.Container.processEvent(Container.java:2229)
at java.awt.Window.processEvent(Window.java:2016)
at java.awt.Component.dispatchEventImpl(Component.java:4861)
at java.awt.Container.dispatchEventImpl(Container.java:2287)
at java.awt.Window.dispatchEventImpl(Window.java:2713)
at java.awt.Component.dispatchEvent(Component.java:4687)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:707)
at java.awt.EventQueue.access$000(EventQueue.java:101)
at java.awt.EventQueue$3.run(EventQueue.java:666)
at java.awt.EventQueue$3.run(EventQueue.java:664)
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:680)
at java.awt.EventQueue$4.run(EventQueue.java:678)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:677)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:211)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:128)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:117)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:113)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:90)
Java指向我的代码块是这样的:
for (int i = 1; i < elipsasCol.size(); i++) {
if (elipsasCol.get(i) != null && elipsasCol.get(i).contains(mouse)) {
// This line
double modulo = Math.sqrt(Math.pow(mouse.x - elipsasCol.get(i).getCenterX(), 2)
+ Math.pow(mouse.y - elipsasCol.get(i).getCenterY(), 2));
}
}
该错误不会对程序的性能造成任何麻烦。但是,我很感激有人可以向我解释这个异常的原因是什么。
谢谢!