Switch Statement in Java

The switch statement is Java's multi-way branch statement. It is used to take the place of long if-else chains, and make them more readable. However, unlike if statements, one may not use inequalities; each value must be concretely defined.

There are three critical components to the switch statement:

Case: This is the value that is evaluated for equivalence with the argument to the switch statement.
Default:This is an optional, catch-all expression, should none of the case statements evaluate to true.
Abrupt completion of the case statement; usually break: This is required to prevent the undesired evaluation of further case statements

Syntax:
     switch ( expression )
    {
    case 1 :
         // Block of Statement
         break;
    case 2 :
         // Block of Statement
         break;
    case 3 :
         // Block of Statement
         break;
    case 4 :
         // Block of Statement
         break;
     .
     .
     default :
         // Block of Statement
         break;
    }

This is a Java program that demonstrates the use of the switch statement. The program prompts the user to choose an operation to perform (addition, subtraction, multiplication, or division), and then prompts the user to enter two numbers. The program then performs the selected operation on the two numbers and prints the result. Here's how the program works:

The program starts by printing out the available options (addition, subtraction, multiplication, or division) to the console.
The program prompts the user to enter their choice by printing out "Enter Your Choice : ".
The user's choice is read in using the Scanner class and stored in the variable ch.
The program prompts the user to enter two numbers by printing out "Enter 2 Nos : ".
The user's two numbers are read in using the Scanner class and stored in the variables a and b.
The program uses a switch statement to perform the operation selected by the user. If the user entered 1, the program performs addition; if the user entered 2, the program performs subtraction; if the user entered 3, the program performs multiplication; and if the user entered 4, the program performs division. If the user enters any other value, the program prints "Invalid Selection".
The result of the operation is stored in the variable c.
The result of the operation is printed out to the console using System.out.println().

Source Code

import java.util.Scanner;
 
//Switch Case Statement in Java
public class switch_demo {
    public static void main(String args[]) {
        int a,b,c,ch;
        System.out.println("1.Addition");
        System.out.println("2.Subtraction");
        System.out.println("3.Multiplication");
        System.out.println("4.Division");
        System.out.println("Enter Your Choice : ");
        Scanner in =new Scanner(System.in);
        ch=in.nextInt();
        System.out.println("Enter 2 Nos : ");
        a=in.nextInt();
        b=in.nextInt();
        switch (ch)
        {
            case 1:
                c=a+b;
                System.out.println("Addition : " +c);
                break;
            case 2:
                c=a-b;
                System.out.println("Subtraction : "+c);
                break;
            case 3:
                c=a*b;
                System.out.println("Multiplication : "+c);
                break;
            case 4:
                c=a/b;
                System.out.println("Division : "+c);
                break;
            default:
                System.out.println("Invalid Selection");
                break;
        }
    }
}

Output

1.Addition
2.Subtraction
3.Multiplication
4.Division
Enter Your Choice :
3
Enter 2 Nos :
12
8
Multiplication : 96

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Basic Programs

Materials

Java Materials

Abstract Window Toolkit