Java多线程处理List数据

多线程数量的问题，一般情况下，多线程数量要等于机器CPU核数-1.

实例1：

解决问题：如何让n个线程顺序遍历含有n个元素的List集合

 

 1 import java.util.ArrayList;
 2 import java.util.List;
 3 import org.apache.commons.lang3.ArrayUtils;
 4  
 5 public class Test_4 {
 6     /**
 7      * 多线程处理list
 8      *
 9      * @param data  数据list
10      * @param threadNum  线程数
11      */
12     public synchronized void handleList(List<String> data, int threadNum) {
13         int length = data.size();
14         int tl = length % threadNum == 0 ? length / threadNum : (length
15                 / threadNum + 1);
16  
17         for (int i = 0; i < threadNum; i++) {
18             int end = (i + 1) * tl;
19             HandleThread thread = new HandleThread("线程[" + (i + 1) + "] ",  data, i * tl, end > length ? length : end);
20             thread.start();
21         }
22     }
23  
24     class HandleThread extends Thread {
25         private String threadName;
26         private List<String> data;
27         private int start;
28         private int end;
29  
30         public HandleThread(String threadName, List<String> data, int start, int end) {
31             this.threadName = threadName;
32             this.data = data;
33             this.start = start;
34             this.end = end;
35         }
36         
37         public void run() {
38             List<String> subList = data.subList(start, end)/*.add("^&*")*/;
39             System.out.println(threadName+"处理了"+subList.size()+"条！");
40         }
41  
42     }
43  
44     public static void main(String[] args) {
45         Test_4 test = new Test_4();
46         // 准备数据
47         List<String> data = new ArrayList<String>();
48         for (int i = 0; i < 6666; i++) {
49             data.add("item" + i);
50         }
51         test.handleList(data, 5);
52         System.out.println(ArrayUtils.toString(data));
53     }
54 }

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