java如何通过不同的进程在两个线程中同时处理？

Question

通过调用一些方法，我从DB获得了一个列表X。现在我将列表拆分为两个单独的列表A&；B根据某些标准

必须以不同的方式处理这两份清单。但是我希望在这个时候开始处理这两个列表。不想等待并开始处理第二个

请建议最好的方法是什么

我的是SpringWeb应用程序。这仅适用于特定的服务

提前谢谢

Answer 1

若要处理多个线程，应同步列表。请参阅下面的代码，以在同步块和线程安全中的子列表之间拆分列表

    List xList= Collections.synchronizedList(new ArrayList(10));

     synchronized(xList){
     List aList=xList.subList(0, 5);
     List bList=xList.subList(5, 10);
     }

Answer 2

为了能够作为程序的异步元素处理某些内容，您必须为该操作启动新线程。Java中存在支持这种类型操作的特殊API

您将需要使用类Thread和接口Runnable

{ //Body of some method

     List<Object> sourceList = getList();

     final List<Object> firstList  = createFirstList(sourceList);
     final List<Object> secondList = createsecondList(sourceList);

     //Define the Runnable, that will store the logic to process the lists.

     Runnable processFirstList = new Runnable() {//We create anonymous class
         @Override
        public void run() {
              //Here you implement the logic to process firstList
       }

     };


     Runnable processSecondList = new Runnable() {//We create anonymous class
        @Override
        public void run() {
              //Here you implement the logic to process secondList
       }

     };

     //Declare the Threads that will be responsible for execution of runable logic

     Thread firstListThread  = new Thread(processFirstList);
     Thread secondListThread = new Thread(processSecondList);

     //Start the Threads 

     firstListThread.start();
     secondListThread.start();

}

You should read the tutorial

Answer 3

你的问题太模糊了。一般的答案是为每个列表生成一个Thread并对其进行处理

（未测试，但应能正常工作）

class ListAProcessor implements Runnable {

    private final List<YourListClass> list;

    public ListAProcessor(final List<YourListClass> yourListA) {
        this.list = yourList;
    }

    @Override
    public void run() {
        // Process this.list
    }

}

class ListBProcessor implements Runnable {

    private final List<YourListClass> list;

    public ListBProcessor(final List<YourListClass> yourListB) {
        this.list = yourList;
    }

    @Override
    public void run() {
        // Process this.list
    }
}

public class Main {
    public static void main(final String args[]) {
        List<YourListClass> listA;
        List<YourListClass> listB;
        // Initialize the lists
        Runnable processor = new ListAProcessor(listA);
        processor.start();
        processor = new ListBProcessor(listB);
        processor.start();
    }
}