package Semester2;

import java.lang.Thread;

public class Vorlesung3 extends Thread{

    static int sharedvar = 5;

    boolean updown;
    int howmuch;


    public Vorlesung3(boolean updown, int howmuch, String name) {
        this.updown = updown;
        this.howmuch = howmuch;
        this.setName(name);
    }


    public static void main(String[] args) {
        Vorlesung3 zaehler1 = new Vorlesung3(true, 1, "Thread1");
        zaehler1.start();
        Vorlesung3 zaehler2 = new Vorlesung3(false, 1, "Thread2");
        zaehler2.start();

    }


    public void run() {
        while (sharedvar != 0) {
            berechnung(this.updown, this.howmuch);
            System.out.println(this.getName() + ": " + sharedvar);
        }
    }


    public static synchronized void berechnung(boolean updown, int howmuch) {
        if (updown) {
            sharedvar += howmuch;
        } else {
            sharedvar -= howmuch;
        }
    }
}