java多线程读取、操作List集合

 本文转载自：http://blog.csdn.net/wang1989cs/article/details/47663565 

最近在写项目代码时，遇到一个问题：如何让n个线程顺序遍历含有n个元素的List集合，几经折腾，终于找到了下面的解决方法。如果有更好的方法，可以共同交流。

import java.util.ArrayList;
import java.util.List;
import org.apache.commons.lang3.ArrayUtils;

public class Test_4 {
    /**
     * 多线程处理list
     *
     * @param data  数据list
     * @param threadNum  线程数
     */
    public synchronized void handleList(List data, int threadNum) {
        int length = data.size();
        int tl = length % threadNum == 0 ? length / threadNum : (length
                / threadNum + 1);
 
        for (int i = 0; i < threadNum; i++) {
            int end = (i + 1) * tl;
            HandleThread thread = new HandleThread("线程[" + (i + 1) + "] ",  data, i * tl, end > length ? length : end);
            thread.start();
        }
    }
 
    class HandleThread extends Thread {
        private String threadName;
        private List data;
        private int start;
        private int end;
 
        public HandleThread(String threadName, List data, int start, int end) {
            this.threadName = threadName;
            this.data = data;
            this.start = start;
            this.end = end;
        }
        
        public void run() {
            List subList = data.subList(start, end)/*.add("^&*")*/;
            System.out.println(threadName+"处理了"+subList.size()+"条！");
        }
 
    }
 
    public static void main(String[] args) {
        Test_4 test = new Test_4();
        // 准备数据
        List data = new ArrayList();
        for (int i = 0; i < 6666; i++) {
            data.add("item" + i);
        }
        test.handleList(data, 5);
        System.out.println(ArrayUtils.toString(data));
    }
}