public class LockSupport01 {

    static Thread t1 = null, t2 = null;

    public static void main(String[] args) {

        char[] aI = "1234567".toCharArray();

        char[] aC = "ABCDEFG".toCharArray();

        t1 = new Thread(()->{

            for (char c : aI) {

                System.out.print(c);

                LockSupport.unpark(t2);

                LockSupport.park();

            }

        });

        t2 = new Thread(()-> {

            for (char c : aC) {

                LockSupport.park();

                System.out.print(c);

                LockSupport.unpark(t1);

            }

        });

        t1.start();

        t2.start();

    }

}