sequence.java

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//: Sequence.java
// Holds a sequence of Objects

interface Selector {
	boolean end();
	Object current();
	void next();
}

public class Sequence {
	private Object[] o;
	private int next = 0;
	public Sequence(int size) {
		o = new Object[size];
	}
	public void add(Object x) {
		if ( next < o.length ) {
			o[next] = x;
			++ next;
		}
	}
	private class SSelector implements Selector {
		int i = 0;
		public boolean end() {
			return i == o.length;
		}
		public Object current() {
			return o[i];
		}
		public void next() {
			if ( i<o.length )
				++i;
		}
	}
	public Selector getSelector() {
		return new SSelector();
	}
	public static void main(String[] args) {
		Sequence s = new Sequence(10);
		for ( int i = 0; i<10; i++ )
			s.add(Integer.toString(i));
		Selector s1 = s.getSelector();
		while ( !s1.end() ) {
			System.out.println((String)s1.current());
		}
	}
}