java多线程 读取list--截取的方式

1.需要一个线程类

package com.tc.testautomation.control.conf;

import org.apache.commons.lang.ArrayUtils;

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

public class HandleThread extends Thread{
    private String threadName;
    private List<String> data;

    public HandleThread(String threadName, List<String> data) {
        this.threadName = threadName;
        this.data = data;
    }

    public void run() {
        // TODO 这里处理数据
//        data.subList(start, end).add("^&*");

        System.out.println(threadName);
        System.out.println(data);
    }

}

2.需要一个调用类

package com.tc.testautomation.control.conf;

import io.swagger.models.auth.In;

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

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<String> data, int threadNum) {
        int len=data.size();
//        System.out.println((double)len/threadNum);
        int interval= (int)Math.ceil((double)len/threadNum);
        System.out.println("interval:"+interval);

        for (int i = 0; i < threadNum; i++) {
//            System.out.println("AA:"+i*interval);
//            System.out.println("BB:"+(interval*(i+1)-1));
            int end=interval*(i+1);

            HandleThread thread = new HandleThread("线程[" + (i + 1) + "] ", data.subList(i*interval,end > len? len:end));
            thread.start();
        }
    }

    public static void main(String[] args) {
        Test_4 test = new Test_4();
        // 准备数据
        List<String> data = new ArrayList<String>();
        for (int i = 0; i < 50; i++) {
            data.add("item" + i);
        }
        test.handleList(data, 6);
//        System.out.println(ArrayUtils.toString(data));
    }
}

 

 

也可以参考这种方式：

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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<string> data, int threadNum) {</string>         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<string> data;</string>         private int start;         private int end;            public HandleThread(String threadName, List<string> data, int start, int end) {</string>             this.threadName = threadName;             this.data = data;             this.start = start;             this.end = end;         }            public void run() {             // TODO 这里处理数据             data.subList(start, end).add("^&*");             System.out.println(threadName)         }        }        public static void main(String[] args) {         Test_4 test = new Test_4();         // 准备数据         List<string> data = new ArrayList<string>();</string></string>         for (int i = 0; i < 5000; i++) {             data.add("item" + i);         }         test.handleList(data, 5);         System.out.println(ArrayUtils.toString(data));     } } 好文要顶