Switch Statement

The switch statement can be used for executing a group of statements based on a value.

Syntax

switch(argument){
  case label1: statement1;
               break;
  case label2: statements2;
               break;
  default: default statements;
}

Program5:

class SwicthDemo{
   public static void main( String[] args){
   int ch=2;
 swicth(ch){
   case1: System.out.println("First choice");
            break;
case2: System.out.println("Second choice");
            break;
case3: System.out.println("Third choice");
            break;
case4: System.out.println("Fourth choice");
            break;
default:  System.out.println("wrong Choice");
     }
  }
}

Rule1: Specifying the arguments to switch statement is mandatory and it should be either byte, short, int or char only.

Rule2: Specifying the flower braces to switch statement is mandatory.

Rule3: Specifying the case default statements in switch is optional.

Rule4: A switch statement can contain any number of cases and it can contain at most one default.

Rule5: The default statement can be specified anywhere in the switch statement.

Rule6: The case labels must be unique i.e. they should not be empty and they should not duplicated.

Rule7: Specifying the break statement is optional. The break is a transfer statement and it will transfer the control from inside the switch to outside the switch, so that it skips the execution of remaining cases.

Rule8: When a switch statement is executed, switch argument is compared with case labels and execution will begin from case onwards whose labels is matching with the argument and continues until it encounters a break statement or until the end of switch.