java - UML关系类型: Variables & Parameters & Cloning

Question

在 UML 图中，这些场景之间的关系是什么？

1. Take 2 classes, class A and class B. There are methods in Class A such as: public function (ArrayList<B>) public function2 (): ArrayList<B>

2. Take 2 classes, class A and class B. There are methods in Class A such as: public function (ArrayList<B>) public function2 (B)

3. Take 1 class, class A. There are methods in Class A to clone itself by using details of the parent, such as: public clone (): A public A (A parent) Is there a relationship line in the UML to itself?

4. Take 2 classes, class C and class D. Class D is an aggregate of class C (C has D). Class D however has a clone function in the same way as Q3 above. Does this mean Class D is not composed of class C?

5. Take 2 classes, class A and class B. There is a method in Class A which have variables that create ArrayList<B>.

我对每种情况的想法(但我非常不确定)

1. A 类使用 B 类(依赖)[尽管我在这和关联之间犹豫不决]

2. A 类使用 B 类(依赖)

3. 是的，A类使用A类(依赖)

4. 不，D类仍然由C类组成

5. A 类具有 B 类(聚合)

我的理解完全错误吗？这些场景中正确的关系是什么？

感谢您的回答

Answer 1

Take 2 classes, class A and class B. There are methods in Class A such as: public function (ArrayList) public function2 (): ArrayList
class A uses class B (dependency) [although I'm tossing up between this and association]

如果 ArrayList 由 B 的实例组成，则它是依赖项 A-->B。如果 A 中有类型 B 的数据成员，那么它将是一个关联(以其变体之一)。

不同之处在于，依赖关系更通用，并且描述了两者之间的弱连接，通常是短时间的连接(就像这里，A 中类型 B 的方法参数)。关联意味着更强大、更持久的关系，通过代码级别的数据成员来表达。

Take 2 classes, class A and class B. There are methods in Class A such as: public function (ArrayList) public function2 (B)
class A uses class B (dependency)

和之前的情况一样，这里很清楚B是一个方法参数。

Take 1 class, class A. There are methods in Class A to clone itself by using details of the parent, such as: public clone (): A

public A (A parent) Is there a relationship line in the UML to itself? Yes, class A uses class A (dependency)

如果类 A 在其数组中具有类 A 的数据成员，则它是与其自身的循环关联。如果不是，则无需放置依赖项 A-->A。无论如何，A 取决于自身，因此它是多余的。

Take 2 classes, class C and class D. Class D is an aggregate of class C (C has D). Class D however has a clone function in the same way as Q3 above. Does this mean Class D is not composed of class C? No, Class D is still composed of Class C

是的。

Take 2 classes, class A and class B. There is a method in Class A which have variables that create ArrayList.
class A has class B (aggregation)

不，除非 A 中也有 B 的数据成员，否则这只是另一种依赖情况，因为链接是暂时的且短暂的(在方法执行期间)