public static void main(String[] args) {
        final Map<Long, xxxItemInfo> cache = new HashMap<>();

        for(int xx=0;xx<10;xx++) {
            cache.clear();
            for (int i = 0; i < 100; i++) {
                final int number1 = i;
                new Thread() {
                    final int number = number1;

                    @Override
                    public void run() {
                        for (int i = 0; i < 10000; i++) {
//                        //睡一会
//                        int sleepTime = ThreadLocalRandom.current().nextInt(10);
//                        try {
//                            Thread.sleep(sleepTime);
//                        } catch (InterruptedException e) {
//                            e.printStackTrace();
//                        }
                            if (i % 2 == 1) {
                                //扩容
                                xxxItemInfo bean = new xxxItemInfo();
                                bean.setKscId(new Long("13748280000278600") + number);
                                bean.setItemName("item:" + (new Long("13748280000278600") + number));

                                cache.put(bean.getKscId(), bean);
                            } else {
                                xxxItemInfo bean = new xxxItemInfo();
                                bean.setKscId(new Long("13748280000278600"));
                                bean.setItemName("item:" + number);

                                cache.put(bean.getKscId(), bean);
                            }
                        }
                    }
                }.start();
            }

            try {
                Thread.sleep(5000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }

            // 打印所有 kscId 对应的 itemInfo 值
            System.out.println("--------------final---------------");
            for (Long key : cache.keySet()) {
                if (key.equals(new Long("13748280000278600"))) {
                    System.out.println("--------------key=" + key);
                    xxxItemInfo b = cache.get(key);
                    System.out.println(b.getItemName());
                }
            }
            System.out.println("--end--");
        }