Relational operators in Java are used to compare two values or expressions. They evaluate relationships such as equality, inequality, and magnitude, and always return a boolean value (true or false). These operators are essential for decision-making and control flow in programs.

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Types of Relational Operators

Below are the two types of relational operators:
1. Equality Operators

• == (Equal To): This checks if two values are equal.
• != (Not Equal To): This checks if two values are not equal.

2. Comparison Operators

• (Greater Than): This checks if the left value is greater than the right value.
• (Less Than): This checks if the left value is smaller than the right value.
• = (Greater Than or Equal To): This checks if the left value is greater than or equal to the right value.
• = (Less Than or Equal To): This hecks if the left value is less than or equal to the right value.

Equal To Operator (==)

The == operator checks whether two values are equal. It returns true if both operands have the same value.
Syntax:

value1 == value2

Example:
Below is the Java program to show Equal To operator:

// Java program to show Equal To operator
public class EqualToOperatorExample 
{
    public static void main(String[] args)
    {
        int a = 10;
        int b = 10;

        // Using Equal To Operator
        System.out.println(a == b);
    }
}

Output:

true

Not Equal To Operator (!=)

The != operator checks whether two values are different. It returns true when the values are not equal.
Syntax:

value1 != value2

Example:
Below is the Java program to show Not Equal To operator:

// Java program to show Not Equal To operator
public class NotEqualOperatorExample 
{
    public static void main(String[] args) 
    {
        int a = 10;
        int b = 5;

        // Using Not Equal To Operator
        System.out.println(a != b);
    }
}

Output:

true

Greater Than Operator ()

The operator checks if the left value is greater than the right value. It is mainly used in numeric comparisons.
Syntax:

value1 value2

Example:
Below is the Java program to show Greater Than operator:

// Java program to show Greater Than operator
public class GreaterThanOperatorExample 
{
    public static void main(String[] args) 
    {
        int a = 15;
        int b = 10;

        // Using Greater Than Operator
        System.out.println(a  b);
    }
}

Output:

true

Less Than Operator ()

The operator checks if the left value is smaller than the right value. It is commonly used in loops and conditions.
Syntax:

value1 value2

Example:
Below is the Java program to show Less Than operator:

// Java program to show Less Than operator
public class LessThanOperatorExample 
{
    public static void main(String[] args) 
    {
        int a = 5;
        int b = 10;

        // Using Less Than Operator
        System.out.println(a  b);
    }
}

Output:

true

Greater Than or Equal To (=)

The = operator checks whether a value is greater than or equal to another value. It combines comparison and equality.
Syntax:

value1 = value2

Example:
Below is the Java program to show Greater Than or Equal To operator:

// Java program to show Greater Than
// or Equal To Operator
public class GreaterThanEqualOperatorExample 
{
    public static void main(String[] args) 
    {
        int a = 10;
        int b = 10;

        // Using Greater Than or Equal To Operator
        System.out.println(a = b);
    }
}

Output:

true

Less Than or Equal To (=)

The = operator checks whether a value is less than or equal to another value. It includes boundary values.
Syntax:

value1 = value2

Example:
Below is the Java program to show Less Than or Equal To operator:

// Java program to show Less Than
// or Equal To Operator
public class LessThanEqualOperatorExample 
{
    public static void main(String[] args) 
    {
        int a = 8;
        int b = 10;

        // Using Less Than or Equal To Operator
        System.out.println(a = b);
    }
}

Output:

true

Relational Operators with Different Data Types

Relational operators can be used with different data types, but their behavior may vary depending on the type.
Syntax:

value1 operator value2

Example:
Below is the Java program to show relational operator with different data types:

// Java program to show relational operator
// with different data types
public class RelationalDifferentDataTypesExample 
{
    public static void main(String[] args) 
    {
        // String comparison using compareTo()
        System.out.println("Apple".compareTo("Banana")  0);

        // Character comparison
        System.out.println('A'  'B');
    }
}

Output:

true
true

Relational Operator in in Conditional Statements

Relational operators are used in conditions to control the flow of a program.
Syntax:

if (condition)
{
    // code
}

Example:

// Java program to show relational operator
// in conditional statements
public class ConditionalStatementExample 
{
    public static void main(String[] args) 
    {
        int age = 18;

        // Using relational operator in condition
        if (age = 18) 
        {
            System.out.println("Eligible to vote");
        } 
        else 
        {
            System.out.println("Not eligible");
        }
    }
}

Output:

Eligible to vote

Conclusion

Relational operators are essential for comparing values and implementing decision-making logic in Java. They form the foundation of conditional statements and help control program execution.

Frequently Asked Questions

1. What is a relational operator?

A relational operator compares two values and returns a boolean result.

2. What is the difference between = and ==?

= is used for assignment, while == is used for comparison.

3. Can relational operators be used with strings?

Yes, they can be used indirectly using methods like compareTo().

4. What do relational operators return?

They always return true or false.

5. Why are relational operators important?

They are used for decision-making and controlling program flow.