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Java 约化类型参数_Java_Generics - Fatal编程技术网
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Java 约化类型参数

java generics

Java 约化类型参数,java,generics,Java,Generics,在抽象类中，我有 public abstract class BaseService<T, R extends BaseDto<ID>, ID extends Object> { ... } 不能隐式声明新的泛型参数。所以没办法做你想做的事 唯一的选项是通配符参数 class BaseService<T, R extends BaseDto<? extends Object>> class BaseService哪一行产生此错误？至少

在抽象类中，我有

public abstract class BaseService<T, R extends BaseDto<ID>, ID extends Object> {
    ...
}
不能隐式声明新的泛型参数。所以没办法做你想做的事

唯一的选项是通配符参数

class BaseService<T, R extends BaseDto<? extends Object>> 

class BaseService哪一行产生此错误？至少可以删除
扩展对象
ID是类参数还是泛型类型参数？

> expected
'{' expecte
wrong number of type arguments; required 1



class BaseService<T, R extends BaseDto<? extends Object>>