public String setGrade() {  // returns the letter grade of the student

   if (percentage >= 90) letterGrade = "A";
   else if (percentage <= 90 && percentage >= 80) letterGrade = "B";

    return letterGrade;

What is your name? John
    Enter the test scores
    90
    100
    90
    Percentage: 93
    letterGrade: null

public class Student {

// Instance Variables
// Each Student object has a name and three test scores
private String name;        // student name
private int test1;      // score for test 1
private int test2;      // score on test 2
private int test3;      // score on test 3
private int percentage; // score the variable average to calculate grade
private String letterGrade; // returns the letter grade of the student

// Constructor method
public Student() {
// Initialize a new student's name to the empty string and test
// scores to zero
name = "";
test1 = 0;
test2 = 0;
test3 = 0;

}

// Other methods

public void setName (String nm) {
    // Set a student's name
    name = nm;
}
public String getName () {
    // Get a student's name
    return name;
}

public void setScore (int i, int score) {
    // Set test i to score
    if (i == 1) test1 = score;
    else if (i == 2) test2 = score;
    else test3 = score;
}

public int getScore (int i) {
// Retrieve score i
    if  (i == 1) return test1;
    else if (i == 2) return test2;
    else return test3;
}

public int getAverage(){
    // Compute and return the average
    int average;
    average = (int) Math.round((test1 + test2 + test3) / 3.0);
    percentage = average;
    return average;
}

public int getHighScore() {
    // Determine and return the highest score
    int highScore;
    highScore = test1;
    if (test2 > highScore) highScore = test2;
    if (test3 > highScore) highScore = test3;
    return highScore;
}

/*
       New Methods by @SimeonTG

*/

/**
 *
 *
 */


public String setGrade() {  // returns the letter grade of the student

   if (percentage >= 90) letterGrade = "A";
   else if (percentage <= 90 && percentage >= 80) letterGrade = "B";

    return letterGrade;



}





public String toString(){
    // Construct and return a string representation of the student
    String str;
    str = "Name:   " + name + "n" + // "n" denotes a new line
          "Test 1: " + test1 + "n" +
          "Test 2: " + test2 + "n" +
          "Test 3: " + test3 + "n" +
          "Average: " + getAverage() + "n" +
          "Grade: " + letterGrade;
    System.out.println("Percentage: " + percentage + "n" + "letterGrade: " + letterGrade);
   return str;
}

import java.util.Scanner;
   package student.application;

   public class StudentApplication {

/**
 * @param args the command line arguments
 */
public static void main(String[] args) {
    // TODO code application logic here

    Scanner reader = new Scanner(System.in);
    Student learner = new Student();
    String name;
    int score;

    // Asks user for information
    System.out.print("What is your name?");
    name = reader.nextLine();
    learner.setName(name); // sets the name of the student

    System.out.println("Enter the test scores ");
    for (int i = 1; i <= 3; i++) {
        score = reader.nextInt();
        learner.setScore(i, score);
    }

    // Prints out name, test scores, average
    learner.setGrade();
    learner.toString();




}