标签：read integer object shm 转换 string highlight reference new t
Map<Integer, Long> map = new HashMap<>(); map.put(0, 0L); map.put(1, 1L); String a = JSON.toJSONString(map); map = JSON.parseObject(a, Map.class); Long b = map.get(1);
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Exception in thread "main" java.lang.ClassCastException: java.lang.Integer cannot be cast to java.lang.Long
json parse时 强制类型转换
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Map<Integer, Long> map = new HashMap<>();
map.put(0, 0L);
map.put(1, 1L);
String a = JSON.toJSONString(map);
map = JSON.parseObject(a, new TypeReference<Map<Integer, Long>>(){});
Long b = map.get(1);
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OK！
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标签：read integer object shm 转换 string highlight reference new t
原文地址：https://www.cnblogs.com/wangsong412/p/11794034.html
