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Comparison and Logical Operators

Comparison Operators

Comparison operators compare two values and return a boolean.

Operator	Meaning	Example (a=10, b=20)	Result
`==`	equal to	`a == b`	false
`!=`	not equal	`a != b`	true
`>`	greater than	`a > b`	false
`<`	less than	`a < b`	true
`>=`	greater or equal	`a >= 10`	true
`<=`	less or equal	`b <= 15`	false

Logical Operators

Operator	Name	True when
`&&`	AND	both sides are true
`\|\|`	OR	at least one side is true
`!`	NOT	reverses true/false

Example

public class Main {
    public static void main(String[] args) {
        int age = 25;
        boolean hasLicence = true;
        boolean isDrunk = false;

        System.out.println(age >= 18 && hasLicence);          // can drive
        System.out.println(age < 18 || !hasLicence);          // cannot drive
        System.out.println(age >= 18 && hasLicence && !isDrunk);
        System.out.println(age == 25);
        System.out.println(age != 25);
    }
}

Output

true
false
true
true
false

Practice

Exercise: A user gets free delivery if the cart total is at least 499 or they are a Plus member. Write the boolean expression for double total and boolean isPlus.

Show answer

boolean freeDelivery = total >= 499 || isPlus;