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via Coderanch by jred ken, 1 year ago
Do not use HelloWorld.add() use Hell oWorld.getContentPane().add() instead
via Oracle Community by 807597, 1 year ago
Do not use lab1.add() use lab1.getContentPane().add() instead
via Google Groups by Tobias Müller, 4 months ago
Do not use javax.swing.JFrame.add() use javax.swing.JFrame.getContentPane().add() instead
via Coderanch by Mitchell Mock, 1 year ago
Do not use javax.swing.JFrame.add() use javax.swing.JFrame.getContentPane().add() instead
via Google Groups by Fuddzy, 6 months ago
Do not use javax.swing.JFrame.add() use javax.swing.JFrame.getContentPane().add() instead
via Stack Overflow by Extorcs
, 5 months ago
Do not use javax.swing.JFrame.add() use javax.swing.JFrame.getContentPane().add() instead
java.lang.Error: Do not use HelloWorld.add() use Hell
 oWorld.getContentPane().add() instead	at javax.swing.JFrame.createRootPaneException(Unknown Source)	at javax.swing.JFrame.addImpl(Unknown Source)	at java.awt.Container.add(Unknown Source)	at HelloWorld.(HelloWorld.java:15)	at HelloWorld.main(HelloWorld.java:50)