JD1's Personal Development Blog

Originally Posted by OA-OD-JD1

From prior programming experience, I'm well aware of what an If Statement is. I'm just going to quickly go over its syntax so I don't forget!

Single Line If Statement Without Else Clause

if(condition)
   instructions if condition proves true (confined to one line of instructions)...

Single Line If Statement With Else Clause

if(condition)
   instructions if condition proves true (confined to one line of instructions)...
else
   instructions if condition proves false (confined to one line of instructions)...

Multiple Line If Statement Without Else Clause

if(condition){
   instructions if condition proves true...
   instructions if condition proves true...
}

Multiple Line If Statement With Multiple Line Else Clause

if(condition){
   instructions if condition proves true...
   instructions if condition proves true...
}else{
   instructions if condition proves false...
   instructions if condition proves false...
}

Else If Statement

if(condition){
   instructions if condition proves true...
}else if(condition){
   instructions if condition proves true...
}else{
   instructions if condition proves false...
}

Java Example

if(age<13){
   System.out.println("You are not yet a teenager!");
   System.out.println("You are most definitely 12 or younger!");
}else{
   System.out.println("You might be a teenager!");
   System.out.println("You are definitely older than 12!");
}

Important Note

Even though it isn't vital to include braces around single line If Statements, it's still advised. This is because, for example, if you wanted to go back and add code to a particular statement, you will have to then add the braces. Often people can overlook this and it's just a bug waiting to happen. This is the case for all statements, not just If Statements.