UDF code issue

Hi

I am getting errors in this java code

kindly help

public String CheckCode(String inputCode,Container container)

{

if(inputCode.equals("AED")||inputCode.equals("AFA")|| inputCode.equals("AFN")||................inputCode.equals("FGH"))

return true;

else

return false;

}

I am using this in graphical mapping , as a condition to create the target structure if the value of the input node is AED , AFA or AFN

inputfield --> CheckCode -

---

>if

Constant(true)-- ->then ---> Target

Can anyone please tell me what is wrong ??

the error that i am getting while activating mapping is

1) incompatible types found : boolean required: java.lang.String return true;

2) incompatible types found : boolean required: java.lang.String return false;

3)cannot resolve symbol

symbol : variable inputCode

location: class com.sap.xi.tf._MM_ABC_ inputCode.equals("AFA")||

I have two questions :

1) Are the parantheses or the brackets in the if condition fine ?

2) is there a problem with the || symbol

3) what is the boolean required for ???

thanks

Dev