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What is indexof in java?
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Does importing a package imports its sub-packages as well in java?
In case of inheritance what is the execution order of constructor and destructor?
7) Suppose there is Student class like class student { int age; string name; } We want to store these objects in a HashMap. Do we need to override any methods in Student class? If any which ones and why? what if i just override equals or just hashcode? what will be the results in both the cases?
What is the use of singleton class?
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Why singleton pattern is better than creating singleton class with static instance?
List the interfaces which extends collection interface?
If you do not want your class to be inherited by any other class. What would you do?
What is length in java?
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What is an abstract class and abstract method?
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