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Java Loop Control



A loop statement allows us to execute a statement or group of statements multiple times


statements are executed sequentially: The first statement in a function is executed first, followed by the second, and so on.

Loop & Description

  • while loop :Repeats a statement while a given condition is true.
  • for loop: Execute a sequence of statements multiple times and abbreviates the code that manages the loop variable.
  • do...while loop: it tests the condition at the end of the loop body.

    • Enhanced for loop in Java

      Used to traverse collection of elements including arrays.:

      for(declaration : expression) {
         // Statements
      }
      
      • Declaration The newly declared block variable, is of a type compatible with the elements of the array you are accessing. The variable will be available within the for block and its value would be the same as the current array element.
      • Expression This evaluates to the array you need to loop through. The expression can be an array variable or method call that returns an array.

      Example

      public class Test {
      
         public static void main(String args[]) {
            int [] numbers = {5, 8, 7, 4, 9};
      
            for(int x : numbers ) {
               System.out.print( x );
               System.out.print(",");
            }
            System.out.print("\n");
            String [] names = {"Tiger", "Puss", "Smokey", "Misty"};
      
            for( String name : names ) {
               System.out.print( name );
               System.out.print(",");
            }
         }
      }
      
      

      Output
      5,8,7,4,9, Tiger,Puss,Smokey,Misty


      Loop Control Statements

      When execution leaves a scope, all automatic objects that were created in that scope are destroyed.


      Java supports the following control statements.
      • Break statement: Terminates the loop or switch statement and transfers execution to the statement immediately following the loop or switch.
      • continue statement: Causes the loop to skip the remainder of its body and immediately retest its condition prior to reiterating.