java 枚举中没有枚举常量类
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No enum const class in Enum
提问by RandomQuestion
public enum ProcessorFactory {
A("ap") {
Processor create() throws Exception {
return new AProcessor();
}
},
B("bp"){
Processor create() throws Exception {
return new BProcessor();
}
};
abstract Processor create() throws Exception;
public static Processor getProcessor(String product) throws Exception {
ProcessorFactory factory = valueOf(product);
return factory.create();
}
private String product;
private ProcessorFactory(String product) {
this.product = product;
}
}
Now when I try to call
现在当我尝试打电话时
ProcessorFactory.getProcessor("ap");
It throws above exception. Any ideas?
它抛出上述异常。有任何想法吗？
回答by krakover
Try ProcessorFactory.getProcessor("A")
尝试 ProcessorFactory.getProcessor("A")
or add a new method:
或添加一个新方法：
public ProcessorFactory getbyProduct(String product) {
for (ProcessorFactory factory : values()) {
if (factory.getProduct().equals(processor)) {
return factory;
}
}
return null; // or throw an exception
}
回答by eran
Well, there really is no enum value named "ap". You only have Aand B. valueOfdoes not use what you store in product. If you want to get enums by some custom identifier, you'll have to use some translation map that will convert productto ProcessorFactoryvalue (or just go over all values, which is less efficient).
好吧，确实没有名为“ap”的枚举值。你只有A和B。valueOf不使用您存储在product. 如果您想通过某些自定义标识符获取枚举，则必须使用一些将转换product为ProcessorFactory值的转换映射（或者只是遍历所有值，效率较低）。
