INTERVIEW QUESTIONS J2EE DETAILS

Question: What is meant by polymorphism in java?How can we achieve polymorphism?Explain with an example.

Answer: Any thing that exist in more than one form is known as the polymorphism.

Example of ploymorphism.
1. Abstract class(Because, In the abstract super class its define some general information, In the subclass it must be override. It it's many form.(It supports single Inheritance))

2. Interface( same as above but supporting multiple inheritance )

3. Method overloading( In the class having a method is same return type but different signature )

Any thing that exist in more than one form is known as the polymorphism.

Example of ploymorphism.
1. Abstract class(Because, In the abstract super class its define some general information, In the subclass it must be override. It it's many form.(It supports single Inheritance))

2. Interface( same as above but supporting multiple inheritance )

3. Method overloading( In the class having a method is same return type but different signature )

Source: CoolInterview.com

Ex:Consider Birds like crow, parrot, peacock etc.. all r different but coming under a common name called birds likewise polymorphism is nothing but one in many form Source: CoolInterview.com

Q:what is difference between string, stringbuffer and stringbuilder? Source: CoolInterview.com

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