Which two method you need to implement for key Object in HashMap ?What is immutable object? Can you write immutable object?What is the difference between creating String as new() and literal?Write code to find the First non repeated character in the String ,How do you handle error condition while writing stored procedure or accessing stored procedure from java

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Which two method you need to implement for key Object in HashMap ?What is immutable object? Can you write immutable object?What is the difference between creating String as new() and literal?Write code to find the First non repeated character in the String  ,How do you handle error condition  while writing stored procedure or accessing stored procedure from java

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