What is difference between jdk,jre and jvm?
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What interface is extended by awt event listeners?
What do bitwise operators do?
What is string in java?
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)
Explain some best practices you would apply while using collection in java?
Write the algorithm to check the number non-leaf nodes in a tree.
What do you mean by boolean?
What is called module?
If an application has multiple classes in it, is it okay to have a main method in more than one class?
Difference between overloading and overridding?
How are the elements of a gridbaglayout organized in java programming?
How can you debug the Java code?