If else statement

The if-else statement executes a single or block of statements of true block when condition becomes true otherwise, it executes the false block of statements.

The only difference in simple if and if-else statement is that the presence of else block when condition becomes false.

Syntax

if ( condition_to_check )
{
    // true block statements
}
else
{
    // false block statements
}

Flowchart of if else statement

How if-else statement works?

The compiler first executes the condition written into the if statement.

If the condition written inside the if statement gives result as true, then compiler enters into the if block otherwise it enters to the else block.

Example 1

Consider, if we want to check the age of person for the voting on election. The computer should decide whether person is eligible for voting or not.We will do this by using the if-else statement as below

class Voting
{
   public static void  main(String args[])
   {
      byte age = 19;
		
      if (age < 18)
      {
         System.out.println("You are not eligible");
      }
      else 
      {
	 System.out.println("Congrats, you can now vote.");
      }
      System.out.println("\nThank you for visiting.");
   }
}

Output

Example 2

Giving discount for golden tickets in the cinema hall.

class CinemaHall
{
   public static void  main(String args[])
   {
      String type;
      byte numOfTickets = 4;
      short discount;
      int withoutDiscount,totalAmount;
      boolean isGolden = true;
		
      if (isGolden)
      {
       discount = (short) (numOfTickets * 50);
       withoutDiscount = (500 * numOfTickets);
	 totalAmount = (500 * numOfTickets) - discount;
	 type = "Golden";
      }
      else 
      {
	 discount = (short) (numOfTickets * 30);
       withoutDiscount = (300 * numOfTickets);
	 totalAmount = (300 * numOfTickets) - discount;
	 type = "Non Golden";
      }
      System.out.println("Ticket type : "+type);
      System.out.println("Total tickets : "+numOfTickets);
      System.out.println("Discount given : "+discount);
      System.out.println("Total without discount : "+withoutDiscount);
      System.out.println("Grand total with discount : "+totalAmount);
   }
}

Output

In above example we have given discount for the golden tickets. If ticket is golden then we are giving discount based on number of tickets purchased multiplied by amount 50.