How to create a thread in java?
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What is java life cycle?
what is the difference between applet and swing and gui application in java . What we do with the collections set and list interface
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Explain the difference between abstract classes and interfaces in java?
can we add two numbers without using arthematic operators? if possible how?
Compare java and python.
What is a resource leak ?
What is identifier give example?
In case of inheritance what is the execution order of constructor and destructor?
what is polymorphism?
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)
why not override thread to make a runnable? : Java thread
Can you create an object of an abstract class?
Core Java 
