Give a practical example of singleton class usage?
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What is the size of boolean variable?
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Why are the methods of the Math class are static?
Why we use static and synchronized in method for single thread model example: public static synchronized add(){}
What is the meaning of find and replace?
Can java list contain duplicates?
What is the difference between overloading and overriding a function?
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What collections you have worked on? Internal working of Hashmap?
What 4 doubled?
Write a regular expression to validate a password. A password must start with an alphabet and followed by alphanumeric characters; its length must be in between 8 to 20.
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Why do we need autoboxing in java?