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Computer Applications | Java | Class 9 | ICSE | 2026 Examination

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Conditional Construct in Java | Class 9 | Computer Applications | ICSE

Lecture Video

Java Nested If Else Explained with Simple Programs for ICSE Students

Nested if else Statements

A nested if statement is an if-else statement written inside another if-else statement. This programming construct allows us to check multiple conditions at different levels, where the checking of inner conditions depends on whether the outer conditions are true or false.

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Formal Definition

When an if-else statement is placed inside the body of another if-else statement (either in the if block or else block or both), it is called a nested if-else statement.

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Syntax

if (condition_1) {
    *// Outer if block*
    Statement1;
    
    if (condition_2) {
        *// Inner if block*
        Statement2;
    }
    else {
        *// Inner else block*
        Statement3;
    }
}
else {
    *// Outer else block*
    if (condition_3) {
        Statement4;
    }
    else {
        Statement5;
    }
}

Real-World Analogies

Example 1: Library Membership System

Think of a library membership system where:

• First check: Is the person eligible for membership (age >= 10)?
  • If YES, second check: What type of membership?
    • If age < 18: Junior membership
    • If age >= 18: Adult membership
  • If NO: Not eligible for membership

This is a perfect example of nested decision-making because the type of membership check only happens after confirming eligibility.

Example 2: Discount Eligibility

Consider an online shopping discount system:

• First check: Is the customer a premium member?
  • If YES, second check: What is the purchase amount?
    • If amount >= 7500: 15% discount
    • If amount < 7500: 5% discount
  • If NO: No discount

Here, the discount percentage check is nested inside the membership check.