Beginner in Java- Need Help With Project

public class StudentClient {

    public static void main(String[] args) {
	Student mark = new Student("Mark", 555555555, 3.6);
        System.out.println(mark.toString());

        Student leslie = new Student();
        leslie.equals(mark);
        leslie.setName("Leslie");
        System.out.println(leslie.toString());
    }
}

public class Student {

    private String name;
    private int socialSecurityNumber;
    private double gpa; // grade point average

    private static final String DEFAULT_NAME = "Unregistered";
    private static final int DEFAULT_SOCIAL_SECURITY_NUMBER = 111111111;
    private static final int HIGHEST_SOCIAL_SECURITY_NUMBER = 999999999;
    private static final double LOWEST_GPA = 0.0;
    private static final double HIGHEST_GPA = 4.0;

    public String toString() {
        String information = "Name: " + name;
        information += "\n" + "Social Security Number: " + socialSecurityNumber;
        information += "\n" + "G.P.A: " + gpa;

        return information;
    }

    public void equals(Student student) {
        this.name = student.getName();
        this.socialSecurityNumber = student.getSocialSecurityNumber();
        this.gpa = student.getGpa();
    }

    // ================================== CONSTRUCTORS =========================================== //

    public Student() {
        this(DEFAULT_NAME, DEFAULT_SOCIAL_SECURITY_NUMBER, LOWEST_GPA);
    }

    public Student(String name) {
        this(name, DEFAULT_SOCIAL_SECURITY_NUMBER, LOWEST_GPA);
    }

    public Student(int socialSecurityNumber) {
        this(DEFAULT_NAME, socialSecurityNumber, LOWEST_GPA);
    }

    public Student(double gpa) {
        this(DEFAULT_NAME, DEFAULT_SOCIAL_SECURITY_NUMBER, gpa);
    }

    public Student(String name, int socialSecurityNumber) {
        this(name, socialSecurityNumber, LOWEST_GPA);
    }

    public Student(String name, double gpa) {
        this(name, DEFAULT_SOCIAL_SECURITY_NUMBER, gpa);
    }

    public Student(int socialSecurityNumber, double gpa) {
        this(DEFAULT_NAME, socialSecurityNumber, gpa);
    }

    public Student(String name, int socialSecurityNumber, double gpa) {

        // check to see if blank string was passed as the name
        // if it was then set name to default value otherwise set this.name = to string passed
        if (name.equals("")) {
            this.name = DEFAULT_NAME;
        }else {
            this.name = name;
        }

        // check that social is between 0 and 999999999
        // if not set it equal to default value
        if (socialSecurityNumber >= DEFAULT_SOCIAL_SECURITY_NUMBER && socialSecurityNumber <= HIGHEST_SOCIAL_SECURITY_NUMBER) {
            this.socialSecurityNumber = socialSecurityNumber;
        } else {
            this.socialSecurityNumber = DEFAULT_SOCIAL_SECURITY_NUMBER;
        }

        // ensure that the gpa passed to the method is between 0.0 and 4.0 inclusive
        // else set it equal to lowest value
        if (gpa >= LOWEST_GPA && gpa <= HIGHEST_GPA) {
            this.gpa = gpa;
        } else {
            this.gpa = LOWEST_GPA;
        }
    }

    // ============================ Getter and Setters ===================================== //

    public String getName() {
        return this.name;
    }

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

    public int getSocialSecurityNumber() {
        return this.socialSecurityNumber;
    }

    public void setSocialSecurityNumber(int socialSecurityNumber) {
        this.socialSecurityNumber = socialSecurityNumber;
    }

    public double getGpa() {
        return this.gpa;
    }

    public void setGpa(double gpa) {
        this.gpa = gpa;
    }
}