Java Switch

The switch statement in Java is used for multi-way decision-making. It provides a way to select one of many code blocks to be executed, based on the value of an expression. Here’s the basic syntax of the switch statement in Java:

switch (expression) {
    case value1:
        // Code to execute if expression equals value1
        break; // Optional, used to exit the switch statement
    case value2:
        // Code to execute if expression equals value2
        break;
    // More cases...
    default:
        // Code to execute if none of the cases match
}

• The expression is evaluated, and the value is compared to each case value.
• If a case value matches the expression, the code block for that case is executed.
• The break statement is optional but is used to exit the switch statement. Without break, the execution would “fall through” to the next case.
• The default case is optional and is executed if none of the case values match the expression.

Here’s an example of using the switch statement in Java to determine the day of the week based on an integer:

public class Main {
    public static void main(String[] args) {
        int day = 2;

        switch (day) {
            case 1:
                System.out.println("Sunday");
                break;
            case 2:
                System.out.println("Monday");
                break;
            case 3:
                System.out.println("Tuesday");
                break;
            case 4:
                System.out.println("Wednesday");
                break;
            case 5:
                System.out.println("Thursday");
                break;
            case 6:
                System.out.println("Friday");
                break;
            case 7:
                System.out.println("Saturday");
                break;
            default:
                System.out.println("Invalid day");
        }
    }
}

In this example, the value of the day variable is compared to the case values, and the corresponding day of the week is printed.

It’s important to use break to exit the switch statement when the desired case is found. Without break, the execution will continue to the next case, which may lead to unexpected behavior.

The switch statement is a useful tool for situations where you have a single expression to evaluate against multiple possible values. It provides a more structured and efficient alternative to using multiple if-else statements.