Java If-Else-If Ladder - Syntax, Flowchart and Examples

⏱️ 8 min read • Beginner Level • Lesson 23

The if-else-if ladder in Java is used when we need to check multiple related conditions one by one. Java checks each condition from top to bottom and executes the block of the first condition that becomes true.

Before learning the if-else-if ladder, you should understand Java if statement, Java if-else statement, and Java operators.

What is if-else-if Ladder in Java?

An if-else-if ladder is a chain of conditions. It is useful when there are more than two possible decisions and only one block should be executed.

Syntax of if-else-if Ladder

The syntax contains one if block, one or more else if blocks, and an optional else block.

if (condition1) {
    // executes if condition1 is true
} else if (condition2) {
    // executes if condition1 is false and condition2 is true
} else if (condition3) {
    // executes if previous conditions are false and condition3 is true
} else {
    // executes if none of the above conditions are true
}

Flowchart of if-else-if Ladder

The following diagram shows how Java checks conditions in an if-else-if ladder.

Real-World Uses of if-else-if Ladder

Java if-else-if Ladder Example

The following program compares the value of x with 10. It checks whether x is greater than, less than, or equal to 10.

public class IfElseIfExample {
    public static void main(String[] args) {
        int x = 10;

        if (x > 10) {
            System.out.println("x is greater than 10");
        } else if (x < 10) {
            System.out.println("x is less than 10");
        } else {
            System.out.println("x is equal to 10");
        }
    }
}

Output:

x is equal to 10

Example: Student Grade Program

This program uses an if-else-if ladder to print a student's grade based on marks.

import java.util.Scanner;

public class GradeExample {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        System.out.print("Enter marks: ");
        int marks = sc.nextInt();

        if (marks < 0 || marks > 100) {
            System.out.println("Invalid marks! Please enter marks between 0 and 100.");
        } else if (marks >= 90) {
            System.out.println("Grade A");
        } else if (marks >= 80) {
            System.out.println("Grade B");
        } else if (marks >= 70) {
            System.out.println("Grade C");
        } else if (marks >= 60) {
            System.out.println("Grade D");
        } else {
            System.out.println("Grade F");
        }

        sc.close();
    }
}

Output1:

Enter marks: 75
Grade C

Output2:

Enter marks: 95
Grade A

Output3:

Enter marks: 120
Invalid marks! Please enter marks between 0 and 100.

Another Example: Day Type Program

The following example checks whether a day number represents a weekday, weekend, or invalid day.

public class DayTypeExample {
    public static void main(String[] args) {
        int day = 6;

        if (day >= 1 && day <= 5) {
            System.out.println("Weekday");
        } else if (day == 6 || day == 7) {
            System.out.println("Weekend");
        } else {
            System.out.println("Invalid day");
        }
    }
}

Output:

Weekend

Difference Between if-else and if-else-if Ladder

Common Mistakes in if-else-if Ladder

Mistake: Wrong Condition Order

In an if-else-if ladder, order matters. General conditions should not be placed before specific conditions.

public class WrongOrderExample {
    public static void main(String[] args) {
        int marks = 95;

        if (marks >= 60) {
            System.out.println("Passed");
        } else if (marks >= 90) {
            System.out.println("Excellent");
        }
    }
}

Interview Questions ⭐

🧠 Test your understanding with a quick quiz

int x = 10;
if (x > 10) {
    System.out.println("Greater");
} else if (x < 10) {
    System.out.println("Less");
} else {
    System.out.println("Equal");
}

int marks = 95;
if (marks >= 60) {
    System.out.println("Passed");
} else if (marks >= 90) {
    System.out.println("Excellent");
}

int marks = 75;
if (marks >= 90) {
    System.out.println("Grade A");
} else if (marks >= 80) {
    System.out.println("Grade B");
} else if (marks >= 70) {
    System.out.println("Grade C");
} else {
    System.out.println("Grade F");
}

🎉 Great job! Continue learning Java step by step.