java.lang.NullPointerException at javax.swing.ImageIcon.(Unknown Source)

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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