The spec ( http://java.sun.com/javase/6/docs/api/javax/swing/border/TitledBorder.html#getBaseline(java.awt.Component,%20int,%20int) ) says: Throws: IllegalArgumentException - if width or height is < 0 For example, the following lines of code will throw nothing: new TitledBorder("123").getBaseline( new Button(), -1, 0 ); new TitledBorder("123").getBaseline( new Component() {}, Integer.MIN_VALUE, 0 );
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