Exception in thread "main" java.lang.NullPointerException
at JPaneltest.myColorPanel.<init>(myColorPanel.java:16)
at JPaneltest.mydrawapplication.<init>(mydrawapplication.java:10)
at JPaneltest.mydrawapplication.main(mydrawapplication.java:27)
at JPaneltest.myColorPanel.<init>(myColorPanel.java:16)
at JPaneltest.mydrawapplication.<init>(mydrawapplication.java:10)
at JPaneltest.mydrawapplication.main(mydrawapplication.java:27)
解决方案 »
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