Enum.java:238:in valueOf': java.lang.IllegalArgumentException: No enum constant jnr.constants.platform.AddressFamily.AF_AF_INET from AddressFamily.java:4:invalueOf ...

valueOf () 方法将数据从其内部形式转换为人类可读的形式。 对于 Java 的所有内置类型，这是一个在字符串中重载的静态方法，因此每种类型都可以正确地转换为字符串。

These include Java SE 7 proposals, Optimized Null Check, and Kinga Dobolyi ‘s thesis Changing Java’s Semantics for Handling Null Pointer Exceptions. Among the many things we can already do rather ...