java do while loop example code ~ ETH Times

JAVA Do While Loop Example Code

In this post we will discuss Java Do While loop. A Java Do While Loop is similar as it is in C or C++ Language. A Java do while loop is some how different from for loop and while loop. The specialty of do while loop is that , its body gets at least once, even the loop condition is false.

Before we go into details of a do while loop, let us discuss what are loops and why loops are needed in any programming language. The answer to this question is , sometimes in programming we need to repeat a set of statements for a number of times. Writing same code again and again in the same program is difficult for a programmer. Also it increases program length. Suppose in a program , there is need of writing a string "Hello " 100 times. Then we have to write print statement 100 times. Writing print statement 100 times in a single program for the same output is difficult. In that case we can use a loop of 100, and in that case we have to use only a single loop statement.

Print ("hello");

The alternative way is use of a for loop.

for (i=1;i<=100;i++)

{

print("Hello");

}

You can see the difference.

Do While Loop

A Java Do while loop executes a set of of Java statements as long as the loop condition evaluates to true.

In some programming conditions ,we require a loop that executes at least once before evaluating Boolean condition.

Java Do while loop is Exit Controlled Loop

General Syntax of Java do while loop

The general syntax of a Java do while loop is:

do
{
set of statements to be repeated;
} while(condition);
Example:

class Test 
{
   public static void main(String args[]){
      int i = 1;

      do{
         System.out.print("value of i : " + i );
         i++;
         System.out.print("\n");
      }while( i < 11 );
   }
}