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Hi, I have a rather naive question - when we have a generalisation/specialisation in an ER diagram, represented by an IS A relationship, can the subtypes (the lower-level entities) participate in their own relationship in which the other subtypes do not? And if they can, is this represented normally, like … |
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Hello, I am quite new to swing, and I was trying the JFrame component, when this exception occurred , just when I tried to instantiate the JFrame object. It says the following: [code=java] Exception in thread "main" java.lang.NullPointerException at JFrameDemo.main(JFrameDemo.java:8) [/code] and line 8 is the following [code=java] JFrame frame … 
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