Switch Case in Java

Switch Case In Java

A switch case is used to execute the code, among many alternatives. You can use a switch case as an alternative of if-elseif condition.

Switch Case Syntax

switch(expression) {
    case value1:
        statement1;
        break;
    case value2:
        statement2;
        break;
    case value3:
        statement3;
        break;
    default:
        default statement;
}

Here, switch expression runs once.
The value of an expression is compared with the value of each case.
If the expression matches with value 1, statement1 is executed. Similarly, statement2 is executed if the expression matches with value 2 and so on.
If there is no match default statement is executed.

Info

Note: Always add break; after each case statement. It breaks out of the switch block when the match is found. For the default case, break; is not necessary.

Example of switch case to print no of day by number.

Here if noOfDays contain a value 1, then it will print Sunday, if noOfDays have a value 7, it will print Saturday.

public class Main {
    public static void main(String[] args) {
        int noOfDays = 2;
        switch (noOfDays) {
            case 1:
                System.out.println("The day is sunday.");
                break;
            case 2:
                System.out.println("The day is monday.");
                break;
            case 3:
                System.out.println("The day is tuesday.");
                break;
            case 4:
                System.out.println("The day is wednesday.");
                break;
            case 5:
                System.out.println("The day is thrusday.");
                break;
            case 6:
                System.out.println("The day is friday.");
                break;
            case 7:
                System.out.println("The day is saturday.");
                break;
            default:
                System.out.println("Invalid option given!!!");
        }
    }
}

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