import java.util.LinkedList;
/**
 *Code that illustrates that garbage collection can slow JVM performance.
 * @author Jayson Falkner - jfalkner@umich.edu
 */
public class MemoryMonster {
    public static void main(String[] args) {
        // make a byte array that almost completely fills up the JVM
        LinkedList ll = new LinkedList();
        
        // track the start time
        long lastTime = System.currentTimeMillis();
        
        // count a slow way using integers
        for (int i=0;i<3000000;i++) {
            MyClass mc = new MyClass();
            mc.number = i;
            mc.name = "Name: "+i;
            
            // set the reference
            ll.add(mc);
            
            // print out status for every 1000
            if (i % 100000 == 0) {
                long endTime = System.currentTimeMillis();
                System.out.println(i+" done in "+(endTime-lastTime)+" milliseconds.");
                lastTime = endTime;
            }
        }
    }
}

class MyClass {
    int number;
    String name;
}