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

1

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());
  }
}

answered Sep 24, 2015 at 22:01

Nick Alexeev

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