Java if-else statement

An if statement can be followed by an optional else statement, which executes when the Boolean expression is false.

Syntax

Following is the syntax of an if...else statement −

if(Boolean_expression) {
   // Executes when the Boolean expression is true
} else {
   // Executes when the Boolean expression is false
}

If the boolean expression evaluates to true, then if the block of code will be executed, otherwise else block of code will be executed.

Flow Diagram

Example

Live Demo

public class Test {
   public static void main(String args[]) {
      int x = 30;

      if( x < 20 ) {
         System.out.print("This is if statement");
      } else {
         System.out.print("This is else statement");
      }
   }
}

This will produce the following result −

Output

This is else statement