请各位大虾指教,帮个忙,这个问题怎么解决?
pipoo 2004-09-30 08:15:25 俄罗斯方块程序:
编译后运行提示如下错误:
java.lang.NullPointerException
at cyj51.tetris.init(tetris.java:149)
at com.borland.jbuilder.runtime.applet.AppletTestbed.startApplet(Unknown Source)
at com.borland.jbuilder.runtime.applet.AppletTestbed.main(Unknown Source)
Exception in thread "main"
提示错误,这是什么原因?应该怎么改?谢谢!