无法引用初始化程序中的静态枚举字段？ [英] Cannot refer to the static enum field within an initializer?

问题描述

我刚刚有Java5项目有这个错误，我尝试使用Java5和Java6，但它仍然存在。它的工作原理（因为它在svn），我怎么可以绕过编译器错误？

I just got Java5 project that has this error, i tried using Java5 and Java6, but its still there. it worked somehow before(since it was in svn), how can i bypass that compiler error?

推荐答案

错误 - 它不会做你想要的。错误是有很好的理由。

Don't "bypass" the error - it won't do what you want it to. The error is there for good reason.

枚举值在任何其他静态字段之前初始化。如果您想要执行类似将所有值添加到地图中的操作，请在之后的静态初始化器中执行：

The enum values are initialized before any other static fields. If you want to do something like adding all the values into a map, do it in a static initializer after everything else:

import java.util.*;

public enum Foo
{
    BAR, BAZ;

    private static final Map<String, Foo> lowerCaseMap;

    static
    {
        lowerCaseMap = new HashMap<String, Foo>();
        for (Foo foo : EnumSet.allOf(Foo.class))
        {
            // Yes, use some appropriate locale in production code :)
            lowerCaseMap.put(foo.name().toLowerCase(), foo);
        }
    }
}

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