Java Switch Case Tutorial

It execute different parts of code an easy way based on the value of the expression.Switch case values must be unique.

switch(expression)
{
   // case statements
   // values must be of same type of expression
   case value1 :
      // Statements
      break; // break is optional
   
   case value2 :
      // Statements
      break; // break is optional
   
   // We can have any number of case statements
   // below is default statement,used when none of the cases is true. 
   // No break is needed in the default case.
   default : 
      // Statements
}

Java Switch Case Example

public class SwitchDemo { 
    public static void main(String[] args) { 

        int month =10; 
        String monthString; 
        switch (month) { 
            case 1:  monthString = "January"; 
                     break; 
            case 2:  monthString = "February"; 
                     break; 
            case 3:  monthString = "March"; 
                     break; 
            case 4:  monthString = "April"; 
                     break; 
            case 5:  monthString = "May"; 
                     break; 
            case 6:  monthString = "June"; 
                     break; 
            case 7:  monthString = "July"; 
                     break; 
            case 8:  monthString = "August"; 
                     break; 
            case 9:  monthString = "September"; 
                     break; 
            case 10: monthString = "October"; 
                     break; 
            case 11: monthString = "November"; 
                     break; 
            case 12: monthString = "December"; 
                     break; 
            default: monthString = "Invalid month"; 
                     break; 
        } 
        System.out.println(monthString); 
    } 
} 

October