What is the chief advantage of the Java Virtual Machine? What is a class? How ar

Question

What is the chief advantage of the Java Virtual Machine? What is a class? How are classes and objects relate? What is the difference between a primitive variable and a reference variable? What's the difference between System.out.print() and System.out.println()? Consider the following code. What will it output? int a = 5, b = 2; System.out.println(a/b); System.out.println ((double)(a/b)); System.out.println (((double)a)/b); Consider the code in the previous question. Why does it give the output it does? What is the difference between a public and private method? Consider the following UML class diagram. Convert it into an equivalent Java class. (Do not worry about inclusions. You may omit function bodies, or leave them blank) What purpose does a constructor serve? Why might we want to provide multiple constructors? What is this? Why might we want to use it? What purpose to get() and set() methods serve? Why might we prefer them to making data member public? What does a toString() method do? What does the following code do? Why? int stop = i; if (stop == 0); {System.out.println("This should never print!";} Generally speaking, when should we use for loops? What about while loops? What is the practical difference between a while loop and a do-while loop?

Explanation / Answer

Please find the answers below

1. A virtual machine will work in the same way on all operating system(on top of it) and here Java virtual machine enables the interoperatability of Java programming language and made it a machine-independent language.

2. A Class can be defined as a template of variables and functions that is later used to create objects with this particular blueprint.

3. A class is a template whereas an object is an instance of a particular class. Eg: A class is a blueprint and object is the actual product built from the class.

4. The basic datatypes which is used to store values is called as a primitive variable. eg: int, long, float, double etc. A reference variable references an objects created using constructors of classes. eg: String.

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