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You can use Reflection. You can also use instanceof.

If you have the String representation of class name and list of Classes then you can just compare the String name with the simple name of each class. If a match is found then you can determine what class that object belongs to

Lets say you have

public static void main(String[] args){

String objName = "Integer";

// provided you have list of classes,

for(int i=0;i< classList.size(); i++){
	if(classList.get(i).class.getSimpleName().equals(objName)){
		 // whatever you want to do
	}
}
}

You can use getClass method to determine the class name. Or use reflection.