Lab Assignment #7 :: CPTR 105 :: 5/1/09

Write a class Student that represents, of course, a student. The attributes that a student should have (implemented as instance variables) are:

• name,
• id (which is a number),
• major
• age

You will also implement these methods:

• accessors and mutators for each of the 4 attributes
• equals(): checks if two students are the same
• isOlder: checks if one student is older than the other
• isInSameMajor(): checks if one student is in the same major as the other

After implementing the class, test it by creating Student objects in a separate test class’s main() method, and calling methods on these objects. For example:

// create objects for 
Student s1 = new Student();
Student s1 = new Student();

// setup attribute values
s1.setName("John");
s1.setAge(23);
s1.setID(13234);
s1.setMajor("Computer Science");

s2.setName("Jane");
s2.setAge(22);
s2.setID(23472);
s2.setMajor("Accounting");

// do comparisions
if (s1.equals(s2))
    System.out.println("The two objects represent the same student.");
else
    System.out.println("The two objects represent different students.");

if (s1.isOlder(s2))
    System.out.println(s1.getName() + " is older than " + s2.getName());
else
    System.out.println(s1.getName() + " is younger than " + s2.getName());

if (s1.isInSameMajor(s2))
    System.out.println(s1.getName() + " is in same major as " + s2.getName());
else
    System.out.println(s1.getName() + " and " + s2.getName() + " are in different majors.");

Solution

public class Student {
    String name;
    int age;
    int id;
    String major;

    /**
    * Accessors and mutators for all attributes
    */ 

    public void setName(String name) {
        this.name = name;
    }

    public String getName() {
        return name;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public int getAge() {
        return age;
    }

    public void setId(int id) {
        this.id = id;
    }

    public int getId() {
        return id;
    }

    public void setMajor(String major) {
        this.major = major;
    }

    public String getMajor() {
        return major;
    }

    /**
    * Comparison methods
    */

    public boolean equals(Student anotherStudent) {
        if (name.equals(anotherStudent.name) && id == anotherStudent.id) 
            return true;
        else
            return false;
    }

    public boolean isInSameMajor(Student anotherStudent) {
        if (major.equals(anotherStudent.major))
            return true;
        else
            return false;
    }

    public boolean isOlder(Student anotherStudent) {
        if (age > anotherStudent.age)
            return true;
        else
            return false;
    }

}