JCH
Java Community | Help. Code. Learn.•6mo ago
Haiku

Is there a standard interface for objects that populate their values from same-type objects?

Essentially the opposite of Cloneable, an interface declaring some method like this: 
interface CopyableFrom {
  void copyFrom(Object other);
}

class Foo implements CopyableFrom {
  private int x;
  private int y;
  
  void copyFrom(Object other) {
    if (other instanceof Foo foo) {
      this.x = foo.x;
      this.y = foo.y;
    }
  }
}
interface CopyableFrom {
  void copyFrom(Object other);
}

class Foo implements CopyableFrom {
  private int x;
  private int y;
  
  void copyFrom(Object other) {
    if (other instanceof Foo foo) {
      this.x = foo.x;
      this.y = foo.y;
    }
  }
}
I feel like either the JDK or some Commons library (Apache, Guava) probably already has something like this, so I don't want to make my own if I can avoid it.
5 Replies
JavaBot
JavaBot•6mo ago
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dan1st
dan1st•6mo ago
no but why would you need that to work with Object you can make something like this with records though why do you need it though?
Madjosz
Madjosz•6mo ago
Are you coming from C++ and looking for something like the std::copy template?
dan1st
dan1st•6mo ago
I don't really see a reason why that'd be necessary though
JavaBot
JavaBot•6mo ago
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