Use methods of another class

Question

Dear Sir/madam,
i have a question about using methods of another class. I will explane:
i have made a class which is called A. This class has some attributes (studentName and examRank) and some methods.
Now i need to made another class called B. Now i want to make an array where i can add some attributes of objects which i made of class A. How can i do that?
Kind regards

Answer 1

Here's a for-instance that doesn't use your exact program but demonstrates the point:
public class A
  int value;
  String name;
  public A(int value, String name)
    this.name = name;
    this.value = value;
  public int getValue()
    return value;
  public String getName()
    return name;
  public String toString()
    return name + ": " + value;
import java.util.Arrays;
import java.util.Random;
public class B
  private static final String[] NAMES =
    "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"
  private static final int MAX = 100;
  private A[] myAs = new A[NAMES.length];
  private Random random = new Random();
  public B()
    for (int i = 0; i < myAs.length; i++)
      myAs[i] = new A(random.nextInt(MAX), NAMES);
public String toString()
return Arrays.toString(myAs);
public int getTotal()
int temp = 0;
for (int i = 0; i < myAs.length; i++)
temp += myAs[i].getValue();
return temp;
public static void main(String[] args)
B b = new B();
System.out.println(b);
System.out.println("Total: " + b.getTotal());