java help please.

1. Choose 2 of the following 4 functions and implement those two programs in the language of your choice. Be sure to properly comment them with your name and purpose of the program as a preamble to the file, what functions are present in the file (refer to the numbers 1-4 below), document all functions, and observe proper rules for naming of variables and indentation in the language of your choice. You should implement each of these as a function in your program and call them from a main function in your program. 3. Write a program to take an integer and write its value out in hex. You cannot use string formatting but must mask 4 bits at a time and find the value in a table (array) of hex values