45 lines
1023 B
Java
45 lines
1023 B
Java
//: references/Snake.java
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// Tests cloning to see if destination
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// of references 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 Object clone() {
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Object o = null;
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try {
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o = super.clone();
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} catch(CloneNotSupportedException e) {
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System.err.println("Snake can't clone");
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}
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return o;
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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 = (Snake)s.clone();
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System.out.println("s2 = " + s2);
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s.increment();
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System.out.println("after s.increment, s2 = " + s2);
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}
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} ///:~
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