Help needed in inserting if instruction

Hi,

How will I insert an if instruction before a set of
instructions?  These set of instructions should
execute only when the if condition satisfies. 

Now I've 

statement1;
statement2; 
 
in my class file.

I want to generate the class file as

if (){
    statement1;
    statement2; 
}

Any help is appreciated.

Thanks,
Eshwari

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