What package is the string class located in

Question

Problem:

Question 1- What is the maximum expected error-free date rate, for a telephone line with bandwidth 3kHz, noise standard deviation of .2V over the frequency band(0 to 3 kHz), and average signal voltage of 20V?

Question 2- What package is the String class located in?

Question 3- Which string method returns how many characters are in a String object?

Question 4- Write the lines of code to get a version of this String in all upper case letters:

String city = new String(“Charlotte”); String capCity;

 

Please describe in detail what package is the String class located in.