ObjectTracker.java

import java.util.*;
import java.lang.*;

public class ObjectTracker{

    // Code for grader
    private static HashMap<String, ArrayList<Object>> objTracker = new HashMap<String, ArrayList<Object>>();
    // create instancetracker
    private static final int CALLER_INDEX = 3;

    public static void printObjectTracker()
    {
        for(String className: objTracker.keySet())
        {
            System.out.println("Objects for " + className);
            ArrayList<Object> objs = objTracker.get(className);
            for(Object o: objs)
            {
                System.out.println("\t(" + o.getClass() + ") " + o);
            }
        }
    }

    public static ArrayList<Object> getObjectsForClass(String className)
    {
    	return objTracker.get(className);
    }

    public static void addObjectForClass(String className, Object o)
    {
        ArrayList<Object> list = objTracker.get(className);
        if(list == null)
        {
            list = new ArrayList<Object>();
        }
        list.add(o);
        objTracker.put(className, list);
    }

    public ObjectTracker()
    {
        StackTraceElement[] stackTraceElements = Thread.currentThread().getStackTrace();
        StackTraceElement e = stackTraceElements[CALLER_INDEX];
        String className = e.getClassName();
        System.out.println(className);

        addObjectForClass(className, this);
    }
}