concretevisitor.java

23种GOF模式的java代码实现

package org.gof.action.visitor;

import java.util.Collection;
import java.util.Iterator;

public class ConcreteVisitor implements Visitor
{
   //在本方法中,我们实现了对Collection的元素的成功访问
   public void visitCollection(Collection collection) {
     Iterator iterator = collection.iterator();
      while (iterator.hasNext()) {
       Object o = iterator.next();
       if (o instanceof Visitable)
         ((Visitable)o).accept(this);
     }

   }

   public void visitString(StringElement stringE) {
      System.out.println("'"+stringE.getValue()+"'");
   }
   public void visitFloat(FloatElement floatE){
      System.out.println(floatE.getValue().toString()+"f");
   }

}