ava.lang.NullPointerException

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  • Why nullpointer exception
    via by 807595,
    • ava.lang.NullPointerException at Petrakis$1.actionPerformed(Petrakis.java:46) at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1764) at javax.swing.AbstractButton$ForwardActionEvents.actionPerformed(AbstractButton.java:1817)
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