why we use String everywhere in Java, like in labels, text fields even we need some integer value

Answer 1

because we can represent integers in strings easily. but other way is bit difficult

Answer 2

But we have to parse it everytime

Answer 3

yes. that is just one step. And more over you are asking integers for label and text fields right?
labels will display text and text fields also Will have text and text is string data type.