Java Loop Control, Break and Continue.

Java Loop

In computer programming, loops are used to repeat a specific block of code until a certain condition is reached.

Java for Loop

Syntaxfor (initialization; testExpression; update) { // codes inside for loop's body }
Example-Print only even number from 2 to 50.

class Loop {
   public static void main(String[] args) {
    for (int i = 2; i <= 50; i+=2) {
   System.out.println(i);
   }
  }
}

Java nested Loop

When we use loop within loop is called nested loop. That means placing of one loop inside the body of another loop is called nesting.
Example-Print multy table from 2 to 5.

public class Multitbl
{
 public static void main(String[] argv)
 {
  int a,b,c;
  for(a=2;a<=5;a++)
  {
   for(b=1;b<=10;b++)
    {
    c=a*b;
    System.out.println(a+" x "+b+" = "+c);
   }
  }
 }
}

Output

Example-Print pattern.

public class Mypattern
{
 public static void main(String[] argv)
 {
 int a,b,c;
 for(a=1;a<=5;a++)
 {
  for(b=1;b<=5-a;b++)
  {
   System.out.print(' ');
  }
  for(c=1;c<=2*a-1;c++)
  {
   System.out.print(c);
  }
  System.out.println("\n");
  }
 }
}

Output

Java While Loop

The while loop rotates through a block of code as long as a specified condition is true.
Syntaxwhile (condition) { // code block to be executed }Example- Enter any digited number then check and print number is even digited or odd digited along with reverse value.

import java.io.*;
import java.util.*;
public class Myno1
{
 public static void main(String[] args)
 {
  Scanner input=new Scanner(System.in);
  System.out.println("Enter any digit");
  int b=0,c=0,d=0,r=0;
  int a=input.nextInt();
  while(a!=0)
  {
    b=a/10;
    d=a-b*10;
    r=r*10+d;
    c++;
    a=b;
  }
  if(c%2==0)
  {
   System.out.println("Even digit and Reverse="+r);
  }
  else
  {
   System.out.println("Odd digit and Reverse="+r);
  }
 }
}

Output

Java Break

The break statement can also be used to jump out of a loop.
Example

class MyClass {
   public static void main(String[] args) {
    for (int i = 0; i < 10; i++) {
    if (i == 4) {
    {
    break;
    }
   System.out.println(i);
   }
  }
}

Output
0
1
2
3

Java Continue

The continue statement breaks one iteration, if a specified condition occurs, and continues with the next iteration in the loop.
Example

class MyClass {
   public static void main(String[] args) {
    for (int i = 0; i < 6; i++) {
    if (i == 4) {
    {
    continue;
    }
   System.out.println(i);
   }
  }
}