第五次作业（1题,2题,3题,4(1)题)

import java.util.ArrayList;
import java.util.List;
import java.util.Random;

public class Driver {

    private static String[] lastNames = { "Doe", "Smith", "Jones", "Adams",
            "Marshall", "Thompson", "Bradley", "Brown", "White", "Franklin",
            "Davis", "Cohn", "Clark" };
    private static String[] firstNames = { "Mary", "John", "Susan", "Michael",
            "David", "Lisa", "Wendy", "Diane", "Kelly", "Claire", "Elizabeth",
            "Mitchell", "Richard" };

    private static void main(String[] args) {

        // create an empty list
        List<Student> studentList = new ArrayList();

        // initialize random generator
        Random random = new Random();

        // create random number of students
        xinxiStudent(studentList, random);

        // print out the students
        for (Student temp : studentList) {
            System.out.println(temp);

        }

    }

    public static void xinxiStudent(List<Student> studentList, Random random) {
        for (int i = 0; i < 3; i++) {

            // get random first name
            String tempFirstName = firstNames[random.nextInt(firstNames.length)];

            // get random last name
            String tempLastName = lastNames[random.nextInt(lastNames.length)];

            // get random age
            int age = 18 + random.nextInt(20);

            // create student
            Student tempStudent = new Student(tempLastName, tempFirstName, age);

            // add them to the list
            studentList.add(tempStudent);
        }
    }

}