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Classes & Method Signatures

 
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Which would be the classes that would be likely for questions based on method signatures.
Eg. Class String which has various methods like indexOf(), substring() etc.
I was wondering which other classes' method signatures should I actually concentrate on from the JDK Documentation ??
Thanks...
 
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Vijay - String is a good place to start. The objectives also cover the java.lang.Math class, the various primitive 'wrapper' classes, key elements of java.lang.Thread and java.lang.Runnable. Also the objectives mention understanding == and equals() in relation to java.lang.Object, java.lang.Boolean, and String , again.
 
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