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Loops In Java

In this article, we will discuss loops in Java

What Are Loops?

If you talk about the definition of loops in English language that it means

A structure, series, or process, the end of which is connected to the beginning.
A shape produced by a curve that bends round and crosses itself.

But in computer language the definition is quite different, here loop means - ‘A sequence of instructions that repeats either a specified number of times or until a particular condition is met.’

For Loop

for loop executes the code block a specified number of times.

Syntax

for (initialize counter; test counter; increment counter) {
  code to be executed;
}

Example

class MainClass {
  public static void main(String args[]) {
    for (int i = 0; i < 10; i++) {
      System.out.println(i);
    }
  }
}

Output

Execute the above code, you will get following output

Click to Enlarge

While Loop

While loop executes the code until specified condition is not met.

Syntax

while (condition) {
  // code block
}

Example

package com.TestProject;

public class TestClass {
  public static void main(String[] args) {
    int i = 0;
    while (i != 5) {
      System.out.println(i);
      i++;
    }
  }
}

Output

Click to Enlarge

Do While Loop

If you want to execute any loop atleast once, then do while loop should be used. Like while loop, do-while loop also checks the condition but at the end.

Syntax

do {
  // Code block that will be executed atleast once

} while (condition);

Example


public class TestClass {

  public static void main(String[] args) {

    int i = 0;
    do {
      // Code block that will be executed atleast once
      System.out.println(i);

    } while (i != 0);
  }
}

Output

Click to Enlarge

Posted By -	Karan Gupta

Posted On -	Thursday, December 1, 2016

Updated On -	Thursday, September 7, 2017

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