add array version of gradebook

Author: CarlyLanglois

src/org/launchcode/java/demos/collections/ArrayGradebook.java

@@ -0,0 +1,52 @@
+package org.launchcode.java.demos.collections;
+
+import java.util.Scanner;
+
+public class ArrayGradebook {
+
+    public static void main(String[] args) {
+
+        // Allow for at most 30 students
+        int maxStudents = 30;
+
+        String[] students = new String[maxStudents];
+        double[] grades = new double[maxStudents];
+        Scanner in = new Scanner(System.in);
+
+        String newStudent;
+        int numStudents = 0;
+
+        System.out.println("Enter your students (or ENTER to finish):");
+
+        // Get student names
+        do {
+            newStudent = in.nextLine();
+
+            if (!newStudent.equals("")) {
+                students[numStudents] = newStudent;
+                numStudents++;
+            }
+
+        } while(!newStudent.equals(""));
+
+        // Get student grades
+        for (int i = 0; i < numStudents; i++) {
+            System.out.print("Grade for " + students[i] + ": ");
+            double grade = in.nextDouble();
+            grades[i] = grade;
+        }
+
+        // Print class roster
+        System.out.println("\nClass roster:");
+        double sum = 0.0;
+
+        for (int i = 0; i < numStudents; i++) {
+            System.out.println(students[i] + " (" + grades[i] + ")");
+            sum += grades[i];
+        }
+
+        double avg = sum / numStudents;
+        System.out.println("Average grade: " + avg);
+    }
+
+}

…de/java/demos/collections/Gradebook.java …emos/collections/ArrayListGradebook.javasrc/org/launchcode/java/demos/collections/Gradebook.java renamed to src/org/launchcode/java/demos/collections/ArrayListGradebook.java src/org/launchcode/java/demos/collections/Gradebook.java renamed to src/org/launchcode/java/demos/collections/ArrayListGradebook.java

@@ -3,7 +3,7 @@
 import java.util.ArrayList;
 import java.util.Scanner;
 
-public class Gradebook {
+public class ArrayListGradebook {
 
     public static void main(String[] args) {