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via Coderanch by Patrick de Kruijf, 1 year ago
java.lang.NullPointerException at com.dekruijf.calculator.Buttons$1.actionPerformed(Buttons.java:20) at javax.swing.AbstractButton.fireActionPerformed(Unknown Source) at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source) at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source) at javax.swing.DefaultButtonModel.setPressed(Unknown Source)