The Integer.parseInt() java method is used primarily in parsing a String method argument into an Integer object. The Integer object is a wrapper class for the int primitive data type of java API. Eventhough the conversion of String to Integer object is a basic stuff, I am suggesting that we should have a mastery on it. In my years of java programming, I have encountered so many instances that I have to convert from String object to another data type. The Integer.parseInt method is a very convenient Java API to transform a user input in String format into a more robust object type which in this case the Integer.