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What are the popular interview questions on Java Collections topic?

Asked by Rituparna 08/07/2017 Last Modified 11/10/2017

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Hi, Can anyone help me on below queries? 1. What makes a class as "Thread safe class" ? 2. equals() method uses 3. Difference between String vs StringBuffer ?

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finally is block which executes every time regardless exception has occurred or not. Finally is important in case you want to do some task which must be done like clean-up, db connection closure, memory de-allocation etc.

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class HappyGarbage01 { public static void main(String args[]) { HappyGarbage01 h = new HappyGarbage01(); h.methodA(); /* Line 6 */ } Object methodA() { Object obj1 = new Object(); Object [] obj2 = new Object[1]; obj2[0] = obj1; obj1 = null; return obj2[0]; } } Where will be the most chance of the garbage collector being invoked? A. After line 9 B. After line 10 C. After line 11 D. Garbage collector never invoked in methodA()

Hello Shrikant who told you that you can explicity call garbage collector. You cann't call gc explicity even when you use System.gc() it is not guranteed that gc will be invoked it is all up to JVM when...

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