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How can I deep copy a map of maps in Groovy? The map keys are Strings or Ints. The values are Strings, Primitive Objects or other maps, in a recursive way.
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Instead of iterating through all of the entries, we can use the putAll() method, which shallow-copies all of the mappings in one step: HashMap<String, Employee> shallowCopy = new HashMap<>(); shallowCopy. putAll(originalMap); We should note that put() and putAll() replace the values if there is a matching key.
clone() before calling clone() on each Cloneable property of the class. Which will create a class equivalent to the following: class Person implements Cloneable { ... public Person clone() throws CloneNotSupportedException { Person result = (Person) super. clone() result.
The easiest way to merge two maps in Groovy is to use + operator. This method is straightforward - it creates a new map from the left-hand-side and right-hand-side maps.
An easy way is this:
// standard deep copy implementation def deepcopy(orig) { bos = new ByteArrayOutputStream() oos = new ObjectOutputStream(bos) oos.writeObject(orig); oos.flush() bin = new ByteArrayInputStream(bos.toByteArray()) ois = new ObjectInputStream(bin) return ois.readObject() } If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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