java multiple constructors [duplicate]

Question

If I have multiple constructors in a class, how do I avoid duplicate code for those fields which are initialized identically for all constructors, or is this not preferable?

For example:

class ComparableThing<K extends Comparable<K>> { private int someField; private Comparator<K> comparator; public ComparableThing() { this.someField = 0; this.comparator = Comparator.naturalOrder(); } public ComparableThing(Comparator<K> comp) { this.someField = 0; this.comparator = comp; } }

Is there a way to avoid the duplicate code in initializing someField, or is this duplicate code considered acceptable/preferable?

Nick Alexeev · Accepted Answer · 2015-09-24 22:01:35Z

You can chain the constructors. Call a more general constructor from a more specific constructor. It's not uncommon.

class ComparableThing<K extends Comparable<K>> { private int someField; private Comparator<K> comparator; public ComparableThing(Comparator<K> comp) { // more general constructor this.someField = 0; this.comparator = comp; } public ComparableThing() { this(Comparator.naturalOrder()); } }

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