算法----多线程对List进行操作

class A{
    public static void main(String[] args){

        List<String> scheList = new ArrayList<>();
        scheList.add("1");
        scheList.add("2");
        scheList.add("3");
        scheList.add("4");
        scheList.add("5");
        scheList.add("6");
        scheList.add("7");
        scheList.add("8");
        scheList.add("9");

        //每个线程一次处理的数量
        int num = 2;
        //线程数量
        int threadnum=4;
        
        
        int j = 0;
        int k = j+num;
        ArrayList<Thread> threads = new ArrayList<>();
        while (true){
            for (int i = 0; i < threadnum; i++) {
                if (k>scheList.size()){
                    k=scheList.size();
                }
                List<String> strings1 = scheList.subList(j, k);
                int finalK = k;
                threads.add(new Thread(new Runnable() {
                    @Override
                    public void run() {
                        try {
                            System.out.println(strings1);
                        }catch (Exception e){
                            System.out.println(e);
                        }
                    }
                }));
                //如果list已经完了，不在创建线程
                if (k==scheList.size()){
                    break;
                }
                //当先线程数量-1
                if (i<threadnum-1){
                    j=k;
                    k = j+num;
                }
            }
            for(Thread t:threads){
                t.start();
            }
            for(Thread t:threads){
                try {
                    t.join();
                }catch (Exception e){
                    System.out.println(e.getMessage());
                }
            }
            threads.clear();
            if (k==(scheList.size())){
                break;
            }
            j=k;
            k = j+num;
        }

        System.out.println("结束");
    }
}