java.lang.NullPointerException at javax.swing.ImageIcon.(Unknown Source)
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![java.lang.NullPointerException at javax.swing.ImageIcon.(Unknown Source)](/uploads/image/z/14006737-1-7.jpg?t=java.lang.NullPointerException+at+javax.swing.ImageIcon.%28Unknown+Source%29)
java.lang.NullPointerException at javax.swing.ImageIcon.(Unknown Source)
java.lang.NullPointerException at javax.swing.ImageIcon.(Unknown Source)
java.lang.NullPointerException at javax.swing.ImageIcon.(Unknown Source)
空指针异常,应该是你调用了某个对象,声明了,但是没有初始化