集合 Collection：Iterator 走訪器

Iterator 走訪器的走訪 visit 方式是單向的

import java.util.ArrayList;
import java.util.Iterator;

public class CollectionIterator {

 public static void main(String[] args) {
  ArrayList <Integer> list = new ArrayList<> ();
  list.add(50);
  
  Integer[] fruit = {10,60,20,90 };
  for(Integer p : fruit)
   list.add(p);
  
  System.out.println("Number : "+ list);
  
  Iterator<Integer> itera = list.iterator();
  while(itera.hasNext()){
   int num = itera.next();
   if (num >= 50)
    itera.remove();
  }
  
  System.out.println("Number : "+ list);
 }

}

執行結果