java-design-patterns/visitor/src/main/java/com/iluwatar/Unit.java

package com.iluwatar;

public abstract class Unit {

	private Unit[] children;

	public Unit(Unit ... children) {
		this.children = children;
	}
	
	public void accept(UnitVisitor visitor) {
		for (Unit child: children) {
			child.accept(visitor);
		}
	}
}