1. PlacementQuestion
2. Java Questions
3. True False Choice Question

Java Questions

1. What is Operator?

• Answer:
Operators are special symbols that perform specific operations on one or multiple operands, and then return a result.

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2. What are the primitive data types supported by the Java programming language?

• Answer:

The eight primitive data types are supproted by Java Programming Language:

 byte - It is 8-bit signed two's complement integer. It has a minimum value of -128 and a maximum value of 127.

 short - It is a 16-bit signed two's complement integer. It has a minimum value of -32,768 and a maximum value of 32,767.

 int - It is a 32-bit signed two's complement integer. It has a minimum value of -2,147,483,648 and a maximum value of 2,147,483,647.

 long - It is a 64-bit signed two's complement integer. It has a minimum value of -9,223,372,036,854,775,808 and a maximum value of 9,223,372,036,854,775,807.

 float - It is a single-precision 32-bit IEEE 754 floating point.

 double - It is a single-precision 64-bit IEEE 754 floating point

 boolean - boolean data type has two possible values: true and false.

 char - It is a single 16-bit Unicode character.

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3. What is an array?

• Answer:

An array is an object that holds a fixed number of values of a single data type.

Specify length of array when array is created. Each item array is called an element. Array element access through index. Array index numbering begins with 0.

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4. What is Encapsulation?

• Answer:
Hiding internal data from the outside world, and accessing it only through publicly exposed methods is known as data Encapsulation.

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5. What is package?

• Answer:
A package is a namespace that organizes a set of related classes and interfaces.

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6. What is interface?

• Answer:

An interface is a reference type, similar to a class, that can contain only constants, method signatures, and nested types.

There are no method bodies. Interfaces cannot be instantiated - they can only be implemented by classes or extended by other interfaces.

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7. What is Class?

• Answer:
A class is a prototype from which object is created.

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8. What are the benefit of Object?

• Answer:

Modularity - an object can be written and maintained independently from the source code of other objects.

Information-hiding - only interact with object's methods. Details of object remains hidden.

Code reuseability

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