How to write a copy constructor in Java - 037
What if we want to create an instance that's just like the one over there? We just want a copy. This video looks at the copy constructor in Java, and how to create new identical instances.
A copy constructor is this. It's a method that takes an instance of a class, and returns a new instance copied exactly like the first class. You can use a static factory method, but best practice is use a constructor that takes a single instance of the class as a parameter. We'll create our copy constructor to use a constructor.
What goes in our copy constructor? Well the next thought is to create a new enemy object, and copy the attributes over. That looks like this. Unfortunately this doesn't work either. We wanted two enemies, but we really got two enemies sharing a weapon and toolbelt. If we change a value on one weapon, say to overheating, both enemies will experience the change. That's because we did something called a shallow copy.
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Concepts: Java, classes, java copy constructor, constructors
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