如何检查或投掷用户定义的异常，以了解枚举中不存在的值，请说我通过元数据=“ DF”来自邮递员

发布于 2025-02-08 21:08:18 字数 110 浏览 1 评论 0原文

public enum Metadata{
    AC, CD;
}

我在传递枚举中不存在的值时会遇到JSON解析器错误。该错误非常漫长且对用户不可读取。

原文

public enum Metadata{
    AC, CD;
}

I am getting json parser error when passing value which is not there in enum..and that error is very lengthy and not readable to user ..instead I should get a proper readable message but I dont know how to resolve this error

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苏辞 2025-02-15 21:08:18

相反，我应该得到一个适当的可读消息

，然后您需要实现一种可以验证输入的方法，如果提供了 enum-name ，则不存在，它将带有适当的消息的例外。

这样就是这样：

public enum Metadata{
    AC, CD;
    
    public static Metadata get(String name) {
        if (!isValid(name)) throw new MyExceptoin("message");

        return valueOf(name);
    }
    
    public static boolean isValid(String name) {
        
        return Arrays.stream(values()).anyMatch(e -> e.name().equals(name));
    }
}

比捕获IllegalArgumentException（因为它是一个运行时异常），它可以更干净，可以抛出value> value> valueof（），然后扔一个catch块所需的例外。而且，这种方法将无法获得显着的性能优势，因为只有少数枚举会员。

仅出于说明目的，这就是可以捕获和复发的方式：

public static Metadata get(String name) {
    try {
        return valueOf(name);
    } catch (IllegalAccessException e) {
        throw new MyExceptoin("message");
    }
}

instead I should get a proper readable message

Then you need to implement a method that would validate the input and in the case if provided enum-name doesn't exist it would throw an exception with a suitable message.

That's how it might look like:

public enum Metadata{
    AC, CD;
    
    public static Metadata get(String name) {
        if (!isValid(name)) throw new MyExceptoin("message");

        return valueOf(name);
    }
    
    public static boolean isValid(String name) {
        
        return Arrays.stream(values()).anyMatch(e -> e.name().equals(name));
    }
}

It would be more cleaner approach than catching an IllegalArgumentException (because it's a runtime exception) that can be thrown valueOf(), and then throwing a desired exception from the catch block. And you can't gain a significant performance advantage with this approach since there will be only a few enum-members.

Just for illustrative purposes, that's how an exception can be caught and rethrowing:

public static Metadata get(String name) {
    try {
        return valueOf(name);
    } catch (IllegalAccessException e) {
        throw new MyExceptoin("message");
    }
}

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