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via Oracle Community by 807592, 1 year ago
adding a window to a container
java.lang.IllegalArgumentException: adding a window to a container	at java.awt.Container.addImpl(Container.java:1010)	at java.awt.Container.add(Container.java:928)	at javax.swing.JFrame.addImpl(JFrame.java:479)	at java.awt.Container.add(Container.java:351)