AtomicInteger—线程安全的ID自增对象
AtomicInteger，可以用做线程安全的ID自增对象，具体的资料网上搜索一下很多，这边就不列举了，下面是一个例子
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public static ConcurrentHashMap<String, AtomicInteger> ID = new ConcurrentHashMap<String, AtomicInteger>();
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ID.put("Character", new AtomicInteger(1000001));
ID.put("Monster", new AtomicInteger(1000010));
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int intNextCrtID = ID.get("Character").getAndIncrement();
??int intNextMstID = ID.get("Monster").getAndIncrement();
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??System.out.println("intNextCrtID : " + intNextCrtID);//1000001
??System.out.println("intNextMstID : " + intNextMstID);//1000010
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??intNextCrtID = ID.get("Character").getAndIncrement();
??intNextMstID = ID.get("Monster").getAndIncrement();
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??System.out.println("intNextCrtID : " + intNextCrtID);//1000002
??System.out.println("intNextMstID : " + intNextMstID);//1000011
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备注：AtomicInteger 的最大值是2147483647，超过这个数字在递增的话就变成-2147483648
