Java Case

Java case

Created By: chatGPT

In Java, the switch statement is a control flow statement that allows a variable to be tested for equality against a list of values (cases). Below is a code snippet demonstrating how to use a switch statement in Java.

String day = "Wednesday";

switch (day) {
    case "Monday":
        System.out.println("Start of the week!");
        break;
    case "Tuesday":
        System.out.println("Second day of the week!");
        break;
    case "Wednesday":
        System.out.println("Midweek day!");
        break;
    case "Thursday":
        System.out.println("Almost the weekend!");
        break;
    case "Friday":
        System.out.println("Last working day!");
        break;
    case "Saturday":
        System.out.println("Weekend starts!");
        break;
    case "Sunday":
        System.out.println("Weekend ends!");
        break;
    default:
        System.out.println("Not a valid day!");
}

In the above code, we declare a String variable day and use the switch statement to check its value. Depending on the value, a different message is printed. The break statement is used to exit the switch block after executing a case. If none of the cases match, the default case will be executed.

int number = 2;

switch (number) {
    case 1:
        System.out.println("One");
        break;
    case 2:
        System.out.println("Two");
        break;
    case 3:
        System.out.println("Three");
        break;
    default:
        System.out.println("Not one, two, or three");
}

The switch statement can also handle primitive data types such as int, char, byte, and short. Additionally, since Java 7, switch can also be used with String values, providing flexibility in how we can control program flow.

char grade = 'A';

switch (grade) {
    case 'A':
        System.out.println("Excellent");
        break;
    case 'B':
        System.out.println("Good");
        break;
    case 'C':
        System.out.println("Average");
        break;
    case 'D':
        System.out.println("Below Average");
        break;
    case 'F':
        System.out.println("Fail");
        break;
    default:
        System.out.println("Not a valid grade");
}

In this example, a char variable grade is evaluated using the switch statement. Each case corresponds to a possible grade and provides feedback accordingly. Remember, using a switch can be more readable than a long series of if-else statements.

// Example using enum

enum Day {
    SUNDAY, MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY
}

Day today = Day.MONDAY;

switch (today) {
    case SUNDAY:
        System.out.println("Rest day");
        break;
    case MONDAY:
        System.out.println("Start of the work week");
        break;
    // additional cases
    default:
        System.out.println("Another day");
}