Loop Statements in Java

Loop statement enables program to execute the code repeatedly until the condition satisfies.

There are 3 loop statement , that are

1) For loop
2) While loop
3) Do while loop

For loop :

The code in for loop will be executed from the start value until the condition is met.

Example :

public class Forloop
{
   public static void main(String[] args)
   {
      int i;
      for (i = 1; i <=10; i++)
         System.out.println("Testing Solutions");
   }
}

While loop :

The code in while loop will be executed at the time when the condition is true.

Example :

public class Whileloop
{
   public static void main(String[] args)
   {
      int i = 1;
      while (i <= 5)
      {
         System.out.println("Welcome to Testing Solutions");
         i++;
      }
   }
}

Do while loop :

The do while loop is like the while loop except that in do while loop, the block of code is at least executed one time although the condition is not true. The reason is that condition is checked at the bottom, not the top of the loop.

Example :

public class Dowhileloop
{
   public static void main(String[] args)
   {
      int i = 1;
      do
      {
         System.out.println("Testing Solutions");
         i++;
      } while (i <= 10);
   }
}

Thanks ,

A M Balaji

Conditional Statements in Java

The statement that programming language used to decide , which code has to be run when the condition is met.

There are 4 types of Conditional Statements ,  that are

1) if statement
2) if else statement
3) Nested if statement
4) Switch statement

if statement :

The if statement checks the condition and if the result is true , it runs the code.

Example :

public class Ifstatement
{
   public static void main(String[] args)
   {
      int i = 2;
      if (i%2 == 0)
         System.out.println("i is an even number");
   }
}

if else statement :

If the condition is true , then it will execute the "if statement" , else it will execute the "else statement".

Example :

public class Ifelsestatement
{
   public static void main(String[] args)
   {
      int i = 5;
      if (i%2==0)
         System.out.println(i+" is an even number.");
      else
         System.out.println(i+" is an odd number.");
   }
}

Nested if statement :

There will be many conditions in "nested if statement", where any condition can be satisfied.

Example :

public class Ifstatementnested
{
   public static void main(String[] args)
   {
      int i = 1;
      if (i > 0)
         System.out.println(i+" is Positive.");
      else
         if (i < 0)
            System.out.println (i+" is Negative.");
         else
            System.out.println (i+" is Zero.");
   }
}







 switch statement :



The switch statement takes a variable and then has a list of cases or actions to perform for each value that the variable obtains.It uses the word default to perform actions in which the conditions are not met and it uses the word break to stop performing actions.

Example :

public class Switchstatement
{
   public static void main(String[] args)
   {
      int i = 5;
      switch(i)
      {
            case 1:
                    System.out.println ("i is 1");
                    break;
            case 2:
                    System.out.println ("i is 2");
                    break;
            case 3:
                   System.out.println ("i is 3");
                    break;   
            case 4
                  System.out.println(“i is 4”);
                  break;
            case 5:
                  System.out.println(“i is 5”);
                  break;
            default:
                  System.out.println("Invalid value");
                  }
               }
            }

Thanks ,

A M Balaji