Java switch Statement

🔄 Java `switch` Statement

The switch statement is used to select one of many code blocks to execute based on a variable’s value.
It is an alternative to long chains of if...else if.

✅ Syntax of `switch`

📌 Important Notes:

The break keyword stops the execution after a matching case.
If break is omitted, execution continues into the next case (fall-through).
default runs if no case matches (optional but recommended).

Example 1: Basic `switch`

public class Main {
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");
}
}
}

public class Main {

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");

}

📌 Output:

Example 2: Without `break` (Fall-Through)

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

switch (number) {
case 1:
System.out.println("One");
case 2:
System.out.println("Two");
case 3:
System.out.println("Three");
default:
System.out.println("Done");
}
}
}

public class Main {

public static void main(String[] args) {

int number = 2;

switch (number) {

case 1:

System.out.println("One");

case 2:

System.out.println("Two");

case 3:

System.out.println("Three");

default:

System.out.println("Done");

}

📌 Output:

Example 3: `switch` with `String`

public class Main {
public static void main(String[] args) {
String role = "Admin";

switch (role) {
case "Admin":
System.out.println("Welcome Admin");
break;
case "User":
System.out.println("Welcome User");
break;
default:
System.out.println("Unknown Role");
}
}
}

public class Main {

public static void main(String[] args) {

String role = "Admin";

switch (role) {

case "Admin":

System.out.println("Welcome Admin");

break;

case "User":

System.out.println("Welcome User");

break;

default:

System.out.println("Unknown Role");

}

📌 Output:

🚀 Example 4: Multiple Case Labels

public class Main {
public static void main(String[] args) {
char grade = 'B';

switch (grade) {
case 'A':
case 'B':
System.out.println("Excellent");
break;
case 'C':
System.out.println("Good");
break;
default:
System.out.println("Try Again");
}
}
}

public class Main {

public static void main(String[] args) {

char grade = 'B';

switch (grade) {

case 'A':

case 'B':

System.out.println("Excellent");

break;

case 'C':

System.out.println("Good");

break;

default:

System.out.println("Try Again");

}

📌 Output:

🧠 When to Use `switch`?

Use switch when:

✔️ Expression has many fixed values
✔️ Values are int, byte, short, char, enum, or String

Java switch Statement