Incrementador / Decrementador errôneo com threads sem exclusão mútua

CrazyIncrementer.java

public class CrazyIncrementer {

    private static Integer n = 0;
    private static final int c = 100000;

    public static void main(String[] args) {
        try {
            Thread t1 = new Thread(new Runnable() {public void run() {
                for(int i = 0; i < c; i++) { n++; };
            }});
            Thread t2 = new Thread(new Runnable() {public void run() {
                for(int i = 0; i < c; i++) { n--; };
            }});
            t1.start();
            t2.start();
            System.out.println(String.format("%d", n));
        }
        catch(Exception e) {
            e.printStackTrace();
        }
    }

}