出错信息:java.lang.NullPointerException at Matrix.run(Matrix.java:56) at java.lang.Thread.run(Thread.java:534) http://goomoo.uuoo.com java.lang.NullPointerException at Matrix.paint(Matrix.java:45) at sun.awt.RepaintArea.paint(RepaintArea.java:177) at sun.awt.windows.WComponentPeer.handleEvent(WComponentPeer.java:260) at java.awt.Component.dispatchEventImpl(Component.java:3678) at java.awt.Container.dispatchEventImpl(Container.java:1627) at java.awt.Component.dispatchEvent(Component.java:3477) at java.awt.EventQueue.dispatchEvent(EventQueue.java:456) at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchTh read.java:201) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThre ad.java:151) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:145) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:137) at java.awt.EventDispatchThread.run(EventDispatchThread.java:100)
at Matrix.run(Matrix.java:56)
at java.lang.Thread.run(Thread.java:534)
http://goomoo.uuoo.com
java.lang.NullPointerException
at Matrix.paint(Matrix.java:45)
at sun.awt.RepaintArea.paint(RepaintArea.java:177)
at sun.awt.windows.WComponentPeer.handleEvent(WComponentPeer.java:260)
at java.awt.Component.dispatchEventImpl(Component.java:3678)
at java.awt.Container.dispatchEventImpl(Container.java:1627)
at java.awt.Component.dispatchEvent(Component.java:3477)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:456)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchTh
read.java:201)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThre
ad.java:151)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:145) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:137) at java.awt.EventDispatchThread.run(EventDispatchThread.java:100)
输出的是:http://goomoo.uuoo.com而(<applet height="300" width="400" code="FallChar.class"></applet>)则输出一个JAVA图标
可以改成FallChar();或者public FallChar();
概念混淆!