java 组合对象,在Java中合并两个对象

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}

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}

解决方案

Maybe something like

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 might return a new A object instead of modifing current.