Could someone tell me why my quiz scores are not displaying?

Main.java

public class Main {

	public static void main(String[] args) {

		Student jimmy = new Student(null, null, 0);

		jimmy.setQuizScore(95, 0);
		jimmy.setQuizScore(73, 1);
		jimmy.setQuizScore(100, 2);
		jimmy.setQuizScore(55, 3);
		jimmy.setQuizScore(73, 4);
		jimmy.setQuizScore(66, 5);
		jimmy.setQuizScore(92, 6);
		jimmy.setQuizScore(51, 7);
		jimmy.setQuizScore(82, 8);
		jimmy.setQuizScore(62, 9);

		jimmy.setProjectScore(89, 0);
		jimmy.setProjectScore(85, 1);
		jimmy.setProjectScore(97, 2);
		jimmy.setProjectScore(76, 3);
		jimmy.setProjectScore(98, 4);
		jimmy.setProjectScore(85, 5);
		jimmy.setProjectScore(62, 6);
		jimmy.setProjectScore(82, 7);
		jimmy.setProjectScore(51, 8);
		jimmy.setProjectScore(74, 9);
		jimmy.setProjectScore(92, 10);
		jimmy.setProjectScore(58, 11);
		jimmy.setProjectScore(52, 12);
		jimmy.setProjectScore(76, 13);
		jimmy.setProjectScore(94, 14);

		int currentIndex = 0;
		int projectLength = jimmy.getProjectsLength();
		int quizLength = jimmy.getQuizzesLength();

		while (currentIndex <= projectLength) {
			System.out.println(jimmy.getProjectScoreForID(currentIndex));
			currentIndex++;
		}
		
		currentIndex = 0;		
		while (currentIndex <= quizLength) {
			System.out.println(jimmy.getQuizScoreForID(currentIndex));
			currentIndex++;
		}
	}
}

Student.java

public class Student {

	private String firstname;

	private String lastname;

	private int studentID;

	private double[] projects;

	private double[] quizzes;

	public Student(String firstname, String lastname, int ID) {

		this.firstname = firstname;
		this.lastname = lastname;
		studentID = ID;
		projects = new double[15];
		quizzes = new double[10];

		int i = this.projects.length - 1;
		while (i >= 0) {
			this.projects[i] = -1;
			i--;
		}

		int i1 = this.quizzes.length - 1;
		while (i1 >= 0) {
			this.quizzes[i1] = -1;
			i1--;

		}
	}

	public boolean setProjectScore(double projectScore, int projectID) {

		if ((projectID >= projects.length) || (projectID < 0)) {

			return false;

		} else {

			projects[projectID] = projectScore;

			return true;
		}

	}

	public boolean setQuizScore(double quizScore, int quizID) {
		if ((quizID >= quizzes.length) || (quizID < 0)) {
			return false;
		} else {
			quizzes[quizID] = quizScore;
			return true;
		}
	}

	public int getProjectsLength() {
		return this.projects.length;
	}

	public int getQuizzesLength() {
		return this.quizzes.length;
	}

	public double getProjectScore(int index) {
		if (index < 0 || index > projects.length - 1) {
			return -1;
		}
		return projects[index];
	}

	public double getQuizscore(int index) {
		if (index < 0 || index > quizzes.length - 1) {
			return -1;
		}
		return quizzes[index];
	}

	public String getProjectScoreForID(int id) {
		String grade = "";

		if (id <= this.projects.length - 1) {

			if (projects[id] >= 90) {
				grade = "A";
			}
			if (80 <= projects[id] && projects[id] < 90) {
				grade = "B";
			}
			if (70 <= projects[id] && projects[id] < 80) {
				grade = "C";
			}
			if (60 <= projects[id] && projects[id] < 70) {
				grade = "D";
			}
			if (50 <= projects[id] && projects[id] < 60) {
				grade = "F";
			}

		}

		return grade;
	}

	public String getQuizScoreForID(int id) {

		String grade = "";

		if (id <= this.quizzes.length - 1) {

			if (quizzes[id] >= 90) {
				grade = "A";
			}
			if (80 <= quizzes[id] && quizzes[id] < 90) {
				grade = "B";
			}
			if (70 <= quizzes[id] && quizzes[id] < 80) {
				grade = "C";
			}
			if (60 <= quizzes[id] && quizzes[id] < 70) {
				grade = "D";
			}
			if (50 <= quizzes[id] && quizzes[id] < 60) {
				grade = "F";
			}
		}

		return grade;
	}

	public int getNextQuizIndex() {
		int i = 0;
		do {
			if (quizzes[i] == -1.0) {
				return i;
			}
			i++;
		} while (i < quizzes.length);
		
		return -1;
	}

	public int getNextProjectIndex() {
		int i = 0;
		do {
			if (projects[i] == -1.0) {
				return i;
			}
			i++;

		} while (i < projects.length);

		return -1;
	}

}