java.lang.NullPointerException

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  • java.lang.NullPointerException at testClass$2.actionPerformed(testClass.java:32) at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1764) at javax.swing.AbstractButton$ForwardActionEvents.actionPerformed(AbstractButton.java:1817) at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:419)
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