java.lang.UnsupportedOperationException: Not supported yet.

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java.lang.UnsupportedOperationException: Not supported yet.
at javaeditor.Notepad$1.keyPressed(Notepad.java:67)
at java.awt.AWTEventMulticaster.keyPressed(AWTEventMulticaster.java:250)
at java.awt.Component.processKeyEvent(Component.java:6485)
at javax.swing.JComponent.processKeyEvent(JComponent.java:2829)

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