Starting in java

Can anyone explain to me what is ... Java String Method ? ... is there any website that i can read about it ? .....

No such thing. It might refer to a method of the String class. Look at the API reference.

cuase our prof. says .... study about java string method ... ?

String methods, probably. Again, I refer you to the API documentation. Look at the members of java.lang.String and study their purpose. It's always good to know what the language has to offer, lest you reinvent the wheel.

While you're at it, also study the members of the Character and Integer classes.

Most likely he meant what CornedBee suggested but could also be the toString() method although there's not much studying in that.