Java Variables Data Types Operators

What is a variable in Java?

• A variable in Java is a keyword used for defining classes

• A variable in Java is a fixed value that cannot be changed

• A variable in Java is a type of loop used for iteration

• A variable in Java is a container that holds a value which can be changed during the program execution.

How many primitive data types are there in Java?

• 6

• 8

• 10

• 4

What are the arithmetic operators in Java?

• The arithmetic operators in Java are: +, -, *, /, %

• //

• ++

• ^

Explain the difference between '==' and 'equals()' in Java.

• '==' compares content, while 'equals()' compares reference.

• '==' is used for string comparison, while 'equals()' is used for integer comparison.

• '==' is a method in Java, while 'equals()' is an operator.

• '==' is used to compare reference, while 'equals()' is used to compare content.

What is the purpose of the 'final' keyword in Java?

• To improve code readability

• To allow multiple inheritance

• To increase the visibility of a method

• To restrict the user from changing the value of a variable, making it a constant.

What is the difference between 'int' and 'double' data types in Java?

• int stores integer values without decimal points, while double stores floating-point numbers with decimal points.

• int is used for text data, while double is used for numerical data

• int is a primitive data type, while double is an object data type

• int can store negative values, while double cannot

How do you declare a constant variable in Java?

• final int NUM = 10;

• static final int NUM = 10;

• const int NUM = 10;

• final int NUM == 10;

What is the modulus operator used for in Java?

• The modulus operator in Java is used to calculate the square root of a number.

• The modulus operator in Java is used to compare two strings.

• The modulus operator in Java is used to find the remainder of a division operation.

• The modulus operator in Java is used to multiply two numbers.

What is the ternary operator in Java?

• The ternary operator in Java is represented as 'valueIfTrue ? condition : valueIfFalse.'

• The ternary operator in Java is represented as 'condition ? valueIfTrue : valueIfFalse.'

• The ternary operator in Java is represented as 'condition ? valueIfFalse : valueIfTrue.'

• The ternary operator in Java is represented as 'valueIfFalse ? condition : valueIfTrue.'

Explain the concept of type casting in Java.

• Type casting in Java refers to the act of converting a variable to a different scope.

• Type casting in Java is the process of converting a variable to a different name.

• Type casting in Java involves converting a variable from one data type to another, either implicitly or explicitly.

• Type casting in Java involves changing the data type of a method.