Decision Statements - if-else statement

Concept

The if-else statement will execute one group of statements if its boolean expression is true, or another group if its boolean expression is false.

Syntax

Here is the general format:

if (BooleanExpression)

statement or block

else

statement or block

Logic

How if-else statement works?

Like the if statement, a boolean expression is evaluated. If the expression is true, a statement or block of statements is executed. If the expression is false, however, statements within else part is executed.

Example (IfElseDemo.java)

class IfElseDemo {

    public static void main(String args[])

    {

        int i = 20;

  

        if (i < 15)

            System.out.println("i is smaller than 15");

        else

            System.out.println("i is greater than 15");

  

        System.out.println("Outside if-else block");

    }

}




Output

i is greater than 15
Outside if-else block