Difference between string, string builder, and string buffer?
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Why map is used in java?
Explain the difference between the public, private, final, protected, and default modifiers?
What are operators and its types?
What is difference between pointer and reference?
What is string literal in java?
Explain the significance of class loaders in bootstrap?
I want to persist data of objects for later use. What’s the best approach to do so?
Explain differences between checked and unchecked exceptions in java?
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Can a list be null in java?
Why you should not use singleton?
what is the difference between AWT and SWING what is the advantage of using swing?