Programming Exercise(s): refresher Write a program in Java that asks for user in

Question

Programming Exercise(s): refresher

Write a program in Java that asks for user input for the names of 5 people and their ages. Then in the display list the 5 students in order by age first and name second.

The following requirements must be met.

1) Use Blue Jay

2) Must have a class

3) Must have a constructor

4) Must create an object to hold the name and age of the person

5) Must use at least 2 methods other, than the constructor method.

6) Must use proper comments

7) Must have a main method

8) Must compile with no errors.

Explanation / Answer

Student Class:

public class Student {
    private String name;
    private int age;

    public Student(String name, int age) {
        this.name = name;
        this.age = age;
    }

    public String getName() {
        return name;
    }

    public int getAge() {
        return age;
    }
}

Main Method :

import java.util.*;

public class SortingAges {
    public static void main(String[] args) {
        List<Student> studentList = new ArrayList<Student>(5);
        // Scanner accepts input from the user
        Scanner scanner = new Scanner(System.in);
        for (int i =1; i<6 ;i++){
            System.out.println("Enter student "+i+" name:");
            String name = scanner.next();
            System.out.println("Enter student "+i+" age:");
            int age = scanner.nextInt();
            Student student = new Student(name,age);
            // Each student object is created and added to the student list
            studentList.add(student);
        }
        /**
         * Collections.sort() is a method provided by Java that sorts the objects in the list
         * based on comparator. The sorting algorithm is used here is modified merge sort.
         */
        Collections.sort(studentList,new Comparator<Student>() {
            @Override
            public int compare(Student student, Student student1) {
                return student.getAge() - student1.getAge();
            }
        });

        System.out.println("The sorted student list: ");
        for (int i=0; i< studentList.size();i++) {
            System.out.println(studentList.get(i).getName());
        }

    }

}

Please revert back if you need more.

You can copy the same files in BlueJ and run it.

Thanks,

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