What is regex in java?

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What is the disadvantage of synchronization?

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What causes memory leak in java?

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How do you decide when to use arraylist and linkedlist?

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What is a predicate method?

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suppose in a class there is a code like this: { Set hs=new Hashset(); hs.add(new Emp("kathy",1000)); hs.add(new Emp("kathy",2000)); } how can u avoid the above code in your class as set won't allow duplicate objects?

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Why main() method is public, static and void in java ?

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What are the restrictions that are applied to the java static methods?

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Can we catch more than one exception in a single catch block?

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Can we use static class instead of singleton?

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What is the base class of all exception classes?

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Is java a security risk?

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