What's the difference between int and integer in java?
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A abstract class extending an abstract class.Super class has both abstract and non-abstract methods.How can we implement abstract and non-abstract mehtods? Explain with snippet
Can we increase array size dynamically in java?
How do we make a class serialize?
What is a “stateless” protocol ?
How use .contains in java?
why the equals method can be override?when we override the equals method?
Explain the difference between jvm and jre?
What is string length in java?
Is it necessary that each try block must be followed by a catch block?
Say you want to store the information about a number of pets in an array. Typical information that you could store for each pet (where relevant) would be • Breed of animal • Animal's name • Its birth date • Its sex • Whether it has been sterilised or not • When it is due for its next inoculation • When it last had its wings clipped For each type of pet (eg. dog, cat or bird) you would typically define a class to hold the relevant data. Note: You do not need to implement these classes. Just answer the following questions. 3.1.1 What would be the advantage of creating a superclass (eg. Pet) and declaring an array of Pet objects over simply using an array of Objects, storing each of the instances of the different pet classes (eg. Dog, Cat or Bird) in it? 3.1.2 Would you define Pet as a class or as an interface? Why? (2) (2)
What is private public protected in java?
What are the concepts of 'OOPS'?
Core Java 
