Relational Operators

Question 1

Define all java relational operators

Answer 1

JAVA has 6 relational operators :

1. != ( NOT equal)
2. == (equal)
3. > = ( greater than or equals )
4. > (greater than)
5. <= ( greater than or equals)
6. < ( less than )

Question 2

Define the relationship between numeric
promotion and relational operators for
primitive data types !

Answer 2

All primitive data types except boolean that act as operands of any binary relational operator are promoted to the wider data type of the two operands

Here’s a comprehensive list of the relational operators in Java along with the compatible data types for each:

1. != (not equal)

Compatible Types :

All primitive types (int, char, double, float, long, short, byte, boolean)

Object types (compares references, not values)

2. == (equal)

Compatible Types:

All primitive types
Object types (compares references, not values)

3. > (greater than)

Compatible Types:

Numeric types (int, char, double, float, long, short, byte)

4. < (less than)

Compatible Types:

Numeric types

5. > = (greater than or equal to)

Compatible Types:

Numeric types

6. <= (less than or equal to)

Compatible Types:

Numeric types

NOTE

Primitive Numeric Types: int, char, double, float, long, short, byte

Boolean: Used only with != and ==

Object Types: Used with == and != for reference comparison

Note that relational operators are not applicable to boolean types, except for equality and inequality

Question 3

Give common use cases of instanceOf
java relation operator !

Answer 3

The instanceof operator is a unary operator because it checks if the left operand (an object reference) is an instance of the type specified by the right operand, which can be a class or an interface. It returns true if the object is of the same type or a subtype of the specified class or interface.

NOTE

The instanceof operator in Java requires the following data types:

1. Object Type: The left operand must be a reference type (i.e., an object or null).
2. Class or Interface Type: The right operand must be a class name or an interface type.