以下两个例子的区别是什么？ [英] What makes the difference between the two examples below?

问题描述

什么使组合与聚合不同，它们都被声明为私有，在组合示例中我们是在Person的构造函数中创建Address类的对象，如果它是如何使Person对象控制/拥有Address对象。



组成示例：

  public   class 人{
 
 私人 字符串 firstName; 
  private   String  lastName; 
  private 地址; 
 
  //  撰写示例 
  public  Person（）{
 address =  new  Address（）; 
} 
 
 
 
  public 地址getAddress（）{
  return 地址; 
} 
 
 
} 

汇总示例

员工类
 
  public   class 员工{
 
  private   String  firstName; 
  private   String  lastName; 
  private   int  age; 
 
  //  聚合Java示例 
  private 地址; 
 
 
  public   void  setAddress（地址）{
 此 .address = address; 
} 
  public 地址getAddress（）{
  return 地址; 
} 
 
} 

我尝试过：



我无能为力。

解决方案

我强烈建议您阅读： Java，UML和面向对象编程中的关联，组合和聚合之间的区别 [ ^ ]

两者都是聚合（地址和员工可以独立存在）;第二个也显示注射。



https://www.visual-paradigm.com/guide/uml-unified-modeling-language/uml-aggregation- VS-组合物/

what makes composition different from aggregation they are both declared as private, is it in composition example we are creating an object of Address class in constructor of Person, if it's then how this makes the Person object control/own the Address object.

Composition Example:

public class Person {

private String firstName;
private String lastName;
private Address address;

//Composition example
public Person() {
    address = new Address();
}



public Address getAddress() {
    return address;
}


}

Aggregation example

Employee Class

public class Employee {

private String firstName;
private String lastName;
private int age;

//Aggregation Java example
private Address address;


public void setAddress(Address address) {
    this.address = address;
}
public Address getAddress() {
    return address;
}

}

What I have tried:

there was nothing i could try.

解决方案

I'd strongly recommend to read this: Difference between Association, Composition and Aggregation in Java, UML and Object Oriented Programming[^]

Both are "aggregation" (an address and an employee can exist independently); the second also shows "injection".

https://www.visual-paradigm.com/guide/uml-unified-modeling-language/uml-aggregation-vs-composition/

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