// references/Snake.java

// (c)2017 MindView LLC: see Copyright.txt

// We make no guarantees that this code is fit for any purpose.

// Visit http://OnJava8.com for more book information.

// Tests cloning to see if reference

// destinations are also cloned

public class Snake implements Cloneable {

private Snake next;

private char c;

// Value of i == number of segments

public Snake(int i, char x) {

c = x;

if(--i > 0)

next = new Snake(i, (char)(x + 1));

}

public void increment() {

c++;

if(next != null)

next.increment();

}

@Override

public String toString() {

String s = ":" + c;

if(next != null)

s += next.toString();

return s;

}

@Override

public Snake clone() {

try {

return (Snake)super.clone();

} catch(CloneNotSupportedException e) {

throw new RuntimeException(e);

}

}

public static void main(String[] args) {

Snake s = new Snake(5, 'a');

System.out.println("s = " + s);

Snake s2 = s.clone();

System.out.println("s2 = " + s2);

s.increment();

System.out.println(

"after s.increment, s2 = " + s2);

}

}

/* Output:

s = :a:b:c:d:e

s2 = :a:b:c:d:e

after s.increment, s2 = :a:c:d:e:f

*/