一点一点看JDK源码（五）java.util.ArrayList 后篇之SubList

一点一点看JDK源码（五）java.util.ArrayList 后篇之SubList

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本文举例使用的是JDK8的API

目录：一点一点看JDK源码（〇）

SubList可以将一个数组根据index拆分为多个数组，使用多线程对于数组进行遍历

未使用多线程的代码比较简单，代码示例如下：

 package com.FM.ArrayListStudy;

 import java.util.ArrayList;
 import java.util.List;

 public class SubListInArrayListStudy {
     public static void main(String[] args) {
         // 初始化list
         ArrayList<Integer> list01 = new ArrayList<Integer>();
         for (int i = 0; i < 20; i++) {//除4无余数
             list01.add(i + 1);
         }
         ArrayList<Integer> list02 = new ArrayList<Integer>();
         for (int i = 0; i < 30; i++) {//除4有余数
             list02.add(i + 1);
         }

         int size1 = list01.size();
         int last11 = size1/4;
         int last12 = size1/4*2;
         int last13 = size1/4*3;

         int size2 = list02.size();
         int last21 = size2/4;
         int last22 = size2/4*2;
         int last23 = size2/4*3;

         List<Integer> subList11 = list01.subList(0, last11);
         List<Integer> subList12 = list01.subList(last11, last12);
         List<Integer> subList13 = list01.subList(last12, last13);
         List<Integer> subList14 = list01.subList(last13, size1);

         List<Integer> subList21 = list02.subList(0, last21);
         List<Integer> subList22 = list02.subList(last21, last22);
         List<Integer> subList23 = list02.subList(last22, last23);
         List<Integer> subList24 = list02.subList(last23, size2);

         System.out.println(subList11+" size: "+subList11.size());
         System.out.println(subList12+" size: "+subList12.size());
         System.out.println(subList13+" size: "+subList13.size());
         System.out.println(subList14+" size: "+subList14.size());
         System.out.println("-=-=-=-=-=-=-=");
         System.out.println(subList21+" size: "+subList21.size());
         System.out.println(subList22+" size: "+subList22.size());
         System.out.println(subList23+" size: "+subList23.size());
         System.out.println(subList24+" size: "+subList24.size());

     }
 }

运行结果

使用多线程方式的代码连接在此，只是并非使用subList，自行修改

 一点一点看JDK源码（五）java.util.ArrayList 后篇之Spliterator

以上！！