// : c08:Sequence.java
// Holds a sequence of Objects.
// From 'Thinking in Java, 3rd ed.' (c) Bruce Eckel 2002
// www.BruceEckel.com. See copyright notice in CopyRight.txt.
interface Selector {
boolean end();
Object current();
void next();
}
public class Sequence {
private Object[] objects;
private int next = 0;
public Sequence(int size) {
objects = new Object[size];
}
public void add(Object x) {
if (next < objects.length)
objects[next++] = x;
}
private class SSelector implements Selector {
private int i = 0;
public boolean end() {
return i == objects.length;
}
public Object current() {
return objects[i];
}
public void next() {
if (i < objects.length)
i++;
}
}
public Selector getSelector() {
return new SSelector();
}
public static void main(String[] args) {
Sequence sequence = new Sequence(10);
for (int i = 0; i < 10; i++)
sequence.add(Integer.toString(i));
Selector selector = sequence.getSelector();
while (!selector.end()) {
System.out.println(selector.current());
selector.next();
}
}
} ///:~