Why is singleton not thread safe?
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What is user defined exception?
Why stringbuilder is not thread safe in java?
What are E and PI?
In which order the iterator iterates over collection?
How do you control extraneous variables?
When would you use a static class?
what is predefined function in java?
Is array passed by reference in java?
If an application has multiple classes in it, is it okay to have a main method in more than one class?
What is the preferred size of a component in java programming?
What does system.gc() and runtime.gc() methods do?
Explain the difference between jdk, jre, and jvm?