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Closed 12 years ago.

我有一个C#项目的方法看起来像这个

public T AddEC<T>() where T : EntityComponent, new() {
    if (!HasEC<T>())
    {
      T nComponent = new T();
    }
}

我最近才开始与爪哇常规军合作, 但我不知道我如何使用这种方法, 或由于语言限制,

Answer 1

这是一个非常好的文章。

http://www.jprl.com/Blog/archive/ development/2007/Aug-31.html

来源来源:来源:来源:来源:来源:来源

Java type and method constraints are specified using a "mini expression language" within the < and > declaring the generic type parameters. For each type parameter that has constraints, the syntax is:
TypeParameter ListOfConstraints 
Where ListOfConstraints is a & -separated list of one of the following constraints:

Specifying a base class or implemented interface on the Generic Type Argument by using: extends BaseOrInterfaceType

( & must be used instead of , because , separates each generic type parameter.)

Answer 2

举个例子

class GenericClass<T extends Number & Comparable<T>> {
    void print (T t) {
        System.out.println (t.intValue ()); // OK
    }
}

在这个例子中,数字和可比性是C#类声明条款中出现的制约因素。

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