Peterson.java

gistfile1.txt

public class Peterson {
    public volatile boolean[] flag = new boolean[2];
    public volatile int victim;
    public void lock() {
        int i = Integer.parseInt(Thread.currentThread().getName().substring(7)) - 1;
        int j = 1 - i;
        flag[j] = true;
        victim = i;
        while (flag[j] && victim == i) {}; // wait
    }

    public void unlock() {
        int i = Integer.parseInt(Thread.currentThread().getName().substring(7)) - 1;
        flag[i] = false;
    }
}

Thank you! I've found 2 mistakes:

int i = Integer.parseInt(Thread.currentThread().getName().substring(7)) - 1;

should be:

int i = Integer.parseInt(Thread.currentThread().getName().substring(7));

Because thread id starts from 0.

And flag[j] = true; should be flag[i] = true;.