1. Write a program in Java to store a collection of movie names. There should be no duplicate movies in the collection. The program must be able to (20 mark):

• add a movie
• remove a movie
• check if a movie exists
• delete all movies
• print out the number of movies
• print a list of all movie names

use HashSet

2. Write a program in java that implements a HashMap to store students (student IDs as the key, and student names as the value). The program must be able to (10 mark):

• add some students, then print all students’ name
• remove all of the students at once