I am looking for something like an if query in java

Hello I have to work on an excel file and I want to do my work easier. I have to insert a shortcut to an associated number. For Example: If in row b is a "1" , i have to insert "ABC" in row E , if in row "b" is a 3, I have to insert "GHI" .

So i need something like an if- query in Excel. Thank you for your help.