java 较大数据量取差集,list.removeAll性能优化详解

  LinkedList linkedList= new LinkedList(src);//大集合用linkedlist
	HashSet hashSet= new HashSet(oth);//小集合用hashset
	Iterator iter = linkedList.iterator();//采用Iterator迭代器进行数据的操作
	while(iter.hasNext()){
		if(hashSet.contains(iter.next())){
			iter.remove();			
			}	
		}

import java.util.Set;
import java.util.List;
import java.util.HashSet;
import java.util.TreeSet;
import java.util.Iterator;
import java.util.ArrayList;
import java.util.LinkedList;

public class getSet {
 
 public static void main(String args[]) {
  getList();
 }
 
 // 获取两个ArrayList的差集、交集、去重并集(数据量大小不限制)
 private static void getList() {
  List<String> firstArrayList = new ArrayList<String>();
  List<String> secondArrayList = new ArrayList<String>();
  List<String> defectList = new ArrayList<String>();//差集List
  List<String> collectionList = new ArrayList<String>();//交集List
  List<String> unionList = new ArrayList<String>();//去重并集List
  try {
   firstArrayList.add("aaa");
   firstArrayList.add("bbb");
   firstArrayList.add("ccc");
   firstArrayList.add("ddd");

   secondArrayList.add("bbb");
   secondArrayList.add("ccc");
   secondArrayList.add("eee");
   // 获取差集
   defectList = receiveDefectList(firstArrayList, secondArrayList);
   Iterator<String> defectIterator = defectList.iterator();
   System.out.println("===================差集===================");
   while(defectIterator.hasNext()) {
    System.out.println(defectIterator.next());
   }
   // 获取交集
   collectionList = receiveCollectionList(firstArrayList, secondArrayList);
   Iterator<String> collectionIterator = collectionList.iterator();
   System.out.println("===================交集===================");
   while(collectionIterator.hasNext()) {
    System.out.println(collectionIterator.next());
   }
   // 获取去重并集
   unionList = receiveUnionList(firstArrayList, secondArrayList);
   Iterator<String> unionIterator = unionList.iterator();
   System.out.println("===================去重并集===================");
   while(unionIterator.hasNext()) {
    System.out.println(unionIterator.next());
   }
  }catch(Exception e) {
   e.printStackTrace();
  }
 }
 
 /**
  * @方法描述：获取两个ArrayList的差集
  * @param firstArrayList 第一个ArrayList
  * @param secondArrayList 第二个ArrayList
  * @return resultList 差集ArrayList
  */
 public static List<String> receiveDefectList(List<String> firstArrayList, List<String> secondArrayList) {
  List<String> resultList = new ArrayList<String>();
  LinkedList<String> result = new LinkedList<String>(firstArrayList);// 大集合用linkedlist 
  HashSet<String> othHash = new HashSet<String>(secondArrayList);// 小集合用hashset 
  Iterator<String> iter = result.iterator();// 采用Iterator迭代器进行数据的操作 
  while(iter.hasNext()){ 
   if(othHash.contains(iter.next())){ 
    iter.remove();   
   }  
  } 
  resultList = new ArrayList<String>(result);
  return resultList;
 }
 
 /**
  * @方法描述：获取两个ArrayList的交集
  * @param firstArrayList 第一个ArrayList
  * @param secondArrayList 第二个ArrayList
  * @return resultList 交集ArrayList
  */
 public static List<String> receiveCollectionList(List<String> firstArrayList, List<String> secondArrayList) {
  List<String> resultList = new ArrayList<String>();
  LinkedList<String> result = new LinkedList<String>(firstArrayList);// 大集合用linkedlist 
  HashSet<String> othHash = new HashSet<String>(secondArrayList);// 小集合用hashset 
  Iterator<String> iter = result.iterator();// 采用Iterator迭代器进行数据的操作 
  while(iter.hasNext()) {
   if(!othHash.contains(iter.next())) { 
    iter.remove();   
   }  
  }
  resultList = new ArrayList<String>(result);
  return resultList;
 }
 
 /**
  * @方法描述：获取两个ArrayList的去重并集
  * @param firstArrayList 第一个ArrayList
  * @param secondArrayList 第二个ArrayList
  * @return resultList 去重并集ArrayList
  */
 public static List<String> receiveUnionList(List<String> firstArrayList, List<String> secondArrayList) {
  List<String> resultList = new ArrayList<String>();
  Set<String> firstSet = new TreeSet<String>(firstArrayList);
  for(String id : secondArrayList) {
   // 当添加不成功的时候 说明firstSet中已经存在该对象
   firstSet.add(id);
  }
  resultList = new ArrayList<String>(dawjidSet);
  return resultList;
 }
}

===================差集===================
aaa
ddd
===================交集===================
bbb
ccc
=================去重并集==================
aaa
bbb
ccc
ddd
eee