如何在Java中复制对象？

问题：

Consider the code below: 考虑下面的代码：

DummyBean dum = new DummyBean();
dum.setDummy("foo");
System.out.println(dum.getDummy()); // prints 'foo'

DummyBean dumtwo = dum;
System.out.println(dumtwo.getDummy()); // prints 'foo'

dum.setDummy("bar");
System.out.println(dumtwo.getDummy()); // prints 'bar' but it should print 'foo'

So, I want to copy the dum to dumtwo and change dum without affecting the dumtwo . 因此，我想将dum复制到dumtwo并在不影响dumtwo情况下更改dum 。 But the code above is not doing that. 但是上面的代码没有这样做。 When I change something in dum , the same change is happening in dumtwo also. 当我改变的东西dum ，同一个变化在发生dumtwo也。

I guess, when I say dumtwo = dum , Java copies the reference only . 我猜想，当我说dumtwo = dum ，Java 仅复制引用 。 So, is there any way to create a fresh copy of dum and assign it to dumtwo ? 那么，有什么方法可以创建新的dum副本并将其分配给dumtwo吗？

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解决方案：

参考一： https://stackoom.com/question/3e4f/如何在Java中复制对象
参考二： https://oldbug.net/q/3e4f/How-do-I-copy-an-object-in-Java

来源：oschina

链接：https://my.oschina.net/u/4438370/blog/4059403