Java If-else Statement

In Java, the if-else statement is used for decision-making based on conditions. Here's an overview:

Syntax:

if (condition) {
    // Code to execute if the condition is true
} else {
    // Code to execute if the condition is false
}

Simple If-else Statement:

• Executes one block of code if the condition is true, and another block if the condition is false.
• Example:

int x = 10;
if (x > 5) {
    System.out.println("x is greater than 5");
} else {
    System.out.println("x is not greater than 5");
}

Chained If-else Statement:

• Allows multiple conditions to be checked sequentially.
• Example:

int age = 20;
if (age < 18) {
    System.out.println("You are a minor");
} else if (age >= 18 && age < 65) {
    System.out.println("You are an adult");
} else {
    System.out.println("You are a senior citizen");
}

Nested If-else Statement:

• An if-else statement inside another if-else statement.
• Example:

int num = -5;
if (num >= 0) {
    if (num == 0) {
        System.out.println("Number is zero");
    } else {
        System.out.println("Number is positive");
    }
} else {
    System.out.println("Number is negative");
}

 

Summary

The if-else statement in Java provides a way to execute different blocks of code based on whether a condition is true or false. It allows for decision-making in Java programs, enabling the creation of more dynamic and responsive applications. Understanding how to use if-else statements is essential for controlling program flow and implementing logic in Java.