The if keyword in Java programming language

In this tutorial,we will learn about The if keyword in Java programming language

In Java if keyword in java is used to if statement to test the boolean expression. It indicates conditional execution of a block. The condition must be evaluated to a boolean value.

An if statement may have an optional else clause containing code that is executed when the condition is false.

The if keyword in Java programming language — Usage of If key word

Syntax

Syntax of if keyword in java

if(boolean condition)
{
<statements>
}

Syntax of if keyword with else keyword in java

if(boolean condition)
{  //It is executed when boolean condition is false 
<statements>
}
else // it is optional and executed when boolean condition is false 
{
<statements>
}

Example

class If_key{
public static void main(String args[]){
if(test_expression){
System.out.println("if condition is true this statements is executed");

}
else{
System.out.println("if condition is false this statements is executed");
}
}
}

//else is a optional part in this program

Program

class If_Ex{
public static void main(String args[]){
int age=18;
if(age<=19){
System.out.println("you are a teen age boy");

}
else{
System.out.println("you are a person");
}

}

}

When the above code is compiled and executed, it will produce the following results