If your program must select from one of many different actions, the "switch" structure will be more efficient than an "if ..else..." structure.

switch (expression)

{

     case (expression 1):{

     Java statements;

     break;

    }

    case (expression 2):     {

       Java statements;

      break;

      }

   case (expression 3):{

       Java statements;

       break;

       } 

  default:{

   Java statements;

   break;

   }

}

• You MUST use a break statement after each "case" block to keep execution from "falling through" to the remaining case statements.

• Only integer or character types may be used as control expressions in "switch" statements.

• It is best to place the most often used choices first to facilitate faster execution.

• While the "default" is not required, it is recommended.

If you need to have several choices give the same responses, you need to use the following coding style:

switch (value)

{

     case (1):

     case (2):

     case (3):   {

    //The case code for 1, 2, 3

     break;

     case (4):

     case (5):

     case (6):   {

      //The case code for 4, 5, 6

     break;

                      }

     default:    {

      //The code for other values

      break;

      }

}