当具有混合类型(Long和string)的哈希图时，无法将类java.lang.Long强制转换为类java.lang.String错误

Long longValue = 123L;
String stringValue = Long.toString(longValue);

Map<String, String> hashGraph = new HashMap<>();
Long longValue = 123L;
hashGraph.put("key", String.valueOf(longValue));

Map<String, Object> hashGraph = new HashMap<>();
Long longValue = 123L;
String stringValue = "abc";
hashGraph.put("key1", longValue);
hashGraph.put("key2", stringValue);

// 读取值时进行类型检查和转换
Object value1 = hashGraph.get("key1");
if (value1 instanceof Long) {
    Long longValue = (Long) value1;
    // 进行Long类型的操作
}

Object value2 = hashGraph.get("key2");
if (value2 instanceof String) {
    String stringValue = (String) value2;
    // 进行String类型的操作
}