在Java中合并两个对象 [英] Merging two objects in Java

问题描述

我有两个相同类型的对象。

I have two objects of same type.

Class A{
  String a;
  List b;
  int c;
}

A obj1= new A();
A obj2 = new A();

obj1 => {a = "hello";b=null;c=10}
obj2  => {a=null;b= new ArrayList();c=default value}

可以请让我知道将这些对象组合成单个对象的最佳方法是什么？

Can you please let me know what is the best way to combine this objects into single object?

obj3 = {a = "hello";b=(same arraylist from obj2);c=10}

推荐答案

也许类似

class A {
    String a;
    List<..> b;
    int c;

    public void merge(A other) {
        this.a = other.a == null ? this.a : other.a;
        this.b.addAll(other.b);
        this.c = other.c == 0 ? this.c : other.c;
    }
}

A a1 = new A();
A a2 = new A();

a1.a = "a prop";
a2.c = 34;

a1.merge(a2);

A.merge 可能会返回新的一个对象而不是修改当前值。

A.merge might return a new A object instead of modifing current.

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