The switch statement in Java is used to make decisions based on a specific value. It’s helpful when you have several options to choose from, so instead of using many if-else statements, you can use switch to make the code easier to read.

Here’s the basic structure of a switch statement:

switch (expression) {

    case value1:

        // Code to run if expression equals value1

        break;

    case value2:

        // Code to run if expression equals value2

        break;

    // Add more cases as needed

    default:

        // Code to run if none of the cases match

}

Explanation:

  1. expression: This is the variable you want to check.
  2. case value: Each case checks if the expression matches a specific value. If it does, the code in that case runs.
  3. break: This ends the case so the program doesn’t run into the next one.
  4. default: This is optional; it runs if no cases match.

Example

Let's say you want to print the day of the week based on a number:

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");

}

In this example, since day is 3, the output will be "Wednesday".

Comments

Post a Comment

Popular posts from this blog

Image
In Go, the switch statement is a control structure that allows you to execute one of several code blocks based on the value of an expression. It’s a more efficient and cleaner alternative to using multiple if-else statements, especially when you need to check multiple conditions. Go’s switch statement is powerful and flexible, and it can be used for simple comparisons, type assertions, and even with expressions that return multiple values. Basic Syntax of switch The basic structure of a switch statement in Go is: switch expression { case value1: // Code to execute if expression == value1 case value2: // Code to execute if expression == value2 default : // Code to execute if expression doesn't match any of the cases } Example: package main import "fmt" func main () { day := 3 switch day { case 1 : fmt.Println( "Monday" ) case 2 : fmt.Println( "Tuesday" ) case 3 : fmt.Println(...
Read more
Image
  In Rust, the if statement is used for conditional execution of code. It evaluates a condition, and if the condition is true , the associated block of code is executed. Rust's if statements are versatile and integrate seamlessly with the language's emphasis on safety and expressions. Syntax of if The basic structure of an if statement in Rust is: if condition { // Code to execute if the condition is true } Example: fn main () { let number = 10 ; if number > 5 { println! ( "The number is greater than 5." ); } } if-else Statement You can include an else block to execute code when the condition is false . fn main () { let number = 3 ; if number % 2 == 0 { println! ( "The number is even." ); } else { println! ( "The number is odd." ); } } if-else if Ladder For multiple conditions, you can chain if-else if statements: fn main () { let number = 0 ; if number ...
Read more
Image
  if-else statement helps make decisions in your program. It checks a condition (a true or false statement) and runs code based on whether the condition is true or false. Here’s how it works: If statement : It checks if a condition is true. If the condition is true, the code inside the if block runs. Else statement : If the condition is false, the code inside the else block runs. Example: #include <stdio.h> int main() {     int number = 10;     // Check if number is greater than 5     if (number > 5) {         printf("The number is greater than 5\n");     } else {         printf("The number is 5 or less\n");     }     return 0; } How it works: In this example, the condition is number > 5 . If the number is greater than 5, the program will print "The number is greater than 5". If the number is not greater than 5 (false), the program will print "The number is 5 or less...
Read more