Loops in java | Sharp Tutorial

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loop in Java

Loop is used to iterate a block of code mulitple times (till the given condition is true) .

The looping statements are used to execute a single statement or block of statements repeatedly until the given condition is FALSE. So if i have to print myname 100 times, then instead of writing printf hundred times, we can use loop with condition that executes 100 times.

There are following types of commonly loop used in java.

1)while loop

2) do while loop

3) for loop

While loop syntax

while(<condition>)
{
  // body part to be executed till the condtion is true
}

  class WhileLoopExample
  {
    public static void main(String args[])
	 {
	   int i=1;
	   while(i<=100)
	    {
		 System.out.println(i);
		 i++;
	    }
	 }
    }

Above program prints the no 1-to 100 with the help of while loop.

Do While loop Syntax

In do while loop, body of the loop is executed first and after that, the condition is checked.
Do while loop executes at least once even if the condition is not true for a single time.

do
 {
   // body to be executed but executes at least once
 }
while(<condtion>);

  class DoWhileLoopExample
  {
    public static void main(String args[])
	 {
	   int i=100;
	   do
	    {
		 System.out.println("Hello");
		 i++;
	    }
	   while(i<0);
	 }
  }

Above program prints 1 time even if the condition is not true first time as well.

For loop syntax

In for loop, the first part begins with variable’s initialization, followed by the condition and increment/decrement operation on the variable.
The first part (initialization) and the last part (increment/decrement) may not be present, but the semicolon is there.
general syntax for for loop is

for(initialization; condition; increment/decrement)
 {
  //body part to be executed till the condition is true.
 }

 class TablePrint
  {
    public static void main(String args[])
	 {
	   int n=4;
	   for (int i=1; i<=10; i++)
	    {
		 System.out.println(n*i);
	    }
	 }
  }

Above program prints prints the table of the given no ie 4.

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loop in Java

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