Main4.java

class even implements Runnable{
    synchronized public void run(){
        for(int i=1;i<=20;i++){

            if(i%2==0){
                System.out.println(i);
            }

        }
    }
}
class odd implements Runnable{
    public void run(){
        for(int i=0;i<=20;i++){
            if(i%2!=0){
                System.out.println(i);
            }
        }
    }
}
public class Main4 {
    public static void main(String[] args) {
        Runnable obj = new even();
        Runnable obj2 = new odd();

        Thread t1 = new Thread(obj);
        Thread t2 = new Thread(obj2);

        t1.start();
        t2.start();



    }
}