switch

01What is a switch Statement?

A switch statement checks a single value against multiple possible matching cases and runs the code block for whichever case matches. It's a cleaner alternative to writing many else if checks for a single variable.

02Why is it used?

When a program needs to compare one variable against many fixed possibilities — like a day number, a menu choice, or a grade letter — switch makes the code more organized and often easier to read than a long else-if chain.

03Real-Life Example

Think of a TV remote's channel selector. Based on the exact channel number pressed, the TV switches to that specific channel. Each channel number is like a case, matched exactly against your input.

java
switch (variable) {
    case value1:
        // code
        break;
    case value2:
        // code
        break;
    default:
        // code if nothing matches
}

java
public class SwitchDemo {
    public static void main(String[] args) {
        int day = 3;
        switch (day) {
            case 1:
                System.out.println("Monday");
                break;
            case 2:
                System.out.println("Tuesday");
                break;
            case 3:
                System.out.println("Wednesday");
                break;
            default:
                System.out.println("Invalid day");
        }
    }
}

Wednesday