Switch statement in Java

Hello friends how are you, today in this blog i will teach you what is switch statement, syntax of switch , how switch statement works and many programs using switch statement in a very simple way. 

Let's start

 Switch statement in Java

• Switch statement allows us to execute one statement from many statement and the statements are called case.
• Inside the body of switch there are a number of cases and there is a single number is passed at the place of parameter to select and execute a case.

Syntax: 

• In the switch statement a value/number is passed in the place of parameter and the case from which the parameter is matched is executed.
• If no case matched with parameter then default case will execute.
• switch case does not support duplicate cases.
• If we remove break from any case then the next case will execute automatically.
• Default case can be written anywhere in the body of switch but it executes when no case matched.

Example 1:Print day of week

This is very nice example to understand the concept of switch. Here we will take a variable day of integer type to store the number and we will pass this variable as a parameter in switch  and will print the result according to the value of day.

class Easy
{
 public static void main(String[] args) 
 {
  int day=2;
  switch(day)
  {
   case 1:
    System.out.println("Monday");
    break;
   case 2:
    System.out.println("Tuesday");
    break; 
   case 3:
    System.out.println("Wednesday");
    break;
   case 4:
    System.out.println("Thrusday");
    break;
   case 5:
    System.out.println("Friday");
    break;
   case 6:
    System.out.println("Saturday");
    break;
   case 7:
    System.out.println("Sunday");
    break;
   default:
    System.out.println("No case matched");
  }
 }
}
/*
### Output ###
Tuesday
because day is equal to 2 and it matches with
case 2 so the output is Tuesday
*/

Example 2: Check given Alphabet is vowel or consonant.

 If you are learning switch statement this type question is mostly asked. To make this program we will take a character variable ch , after taking user input  we will pass it into switch as a parameter and we will print the result according to cases matched.

As we know that A E I O U and a e i o u are vowels and the remaining alphabets are consonants.

here i am using only small alphabet but you can use both small and capital alphabet as per your requirements.

import java.util.Scanner;
class Easy
{
 public static void main(String[] args) 
 {
  Scanner in=new Scanner(System.in);
  char ch;
  System.out.println("Enter any alphabet");
  ch=in.next().charAt(0);
  switch(ch)
  {
   case 'a':
   case 'e':
   case 'i':
   case 'o':
   case 'u':
    System.out.println("Vowel");
    break;
   default:
    System.out.println("Consonant");
  }
 }
}
/*
### Output ###

Enter any alphabet
m
Consonant
*/

Here in the above example the input character is m and it is matching with any vowels so default case will execute and result will print as Consonant.

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