51 lines
1.2 KiB
Java
51 lines
1.2 KiB
Java
// references/Snake.java
|
|
// (c)2016 MindView LLC: see Copyright.txt
|
|
// We make no guarantees that this code is fit for any purpose.
|
|
// Visit http://mindviewinc.com/Books/OnJava/ 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
|
|
*/
|