52 lines
1.2 KiB
Java
52 lines
1.2 KiB
Java
// references/Snake.java
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// (c)2017 MindView LLC: see Copyright.txt
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// We make no guarantees that this code is fit for any purpose.
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// Visit http://OnJava8.com for more book information.
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// Tests cloning to see if reference
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// destinations are also cloned
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public class Snake implements Cloneable {
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private Snake next;
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private char c;
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// Value of i == number of segments
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public Snake(int i, char x) {
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c = x;
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if(--i > 0)
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next = new Snake(i, (char)(x + 1));
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}
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public void increment() {
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c++;
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if(next != null)
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next.increment();
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}
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@Override
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public String toString() {
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String s = ":" + c;
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if(next != null)
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s += next.toString();
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return s;
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}
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@Override
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public Snake clone() {
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try {
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return (Snake)super.clone();
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} catch(CloneNotSupportedException e) {
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throw new RuntimeException(e);
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}
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}
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public static void main(String[] args) {
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Snake s = new Snake(5, 'a');
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System.out.println("s = " + s);
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Snake s2 = s.clone();
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System.out.println("s2 = " + s2);
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s.increment();
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System.out.println(
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"after s.increment, s2 = " + s2);
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}
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}
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/* Output:
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s = :a:b:c:d:e
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s2 = :a:b:c:d:e
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after s.increment, s2 = :a:c:d:e:f
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*/
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