java - Enum 中没有枚举 const 类

Question

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;
    }
 }

现在当我尝试打电话时

ProcessorFactory.getProcessor("ap");

它抛出上述异常。有什么想法吗？

Answer 1

尝试 ProcessorFactory.getProcessor("A")

或添加新方法:

public ProcessorFactory getbyProduct(String product) {
   for (ProcessorFactory factory : values()) {
      if (factory.getProduct().equals(processor)) {
         return factory;
      }
   }
   return null; // or throw an exception
}