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Switch Case In Java

In this article, we will discuss switch case in Java.

Purpose

Switch-case is also used for conditional programming like if-else. But like if-else, you cannot use greater than or less than operator in switch-case.

Switch-case is used when you want specific code block to be executed based on the value.

Syntax

switch (variable_name) {
    case 'value1':
        ..Code block to be executed
        break;
    case 'value2':
        ..Code block to be executed
        break;
    default:
        ..Code block to be executed
}

In the above code, case statement checks the value of the variable. If the value is matched, then respective code block gets executed. But if no value is matched then, code block in the gets executed.

Example

/* package whatever; // don't place package name! */
import java.util.*;
import java.lang.*;
import java.io.*;



/* Name of the class has to be "Main" only if the class is public. */
class Test {
    public static void main(String[] args) throws java.lang.Exception {
        char color = 'W';

        switch (color) {
            case 'R':
                System.out.println("You selected RED");
                break;
            case 'G':
                System.out.println("You selected GREEN");
                break;
            default:
                System.out.println("You have not selected the valid color");

        }
    }
}

Output

If the value of variable ‘color’ is ‘R’, then ‘You selected ‘RED’ is printed on the screen
If the value of variable ‘color’ is ‘G’, then ‘You selected ‘GREEN’ is printed on the screen
If the value of variable ‘color’ is ‘W’, then ‘You have not selected the valid color’ is printed on the screen

Posted By -	Karan Gupta

Posted On -	Monday, January 2, 2017

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