OnJava8-Examples/reuse/BlankFinal.java

// reuse/BlankFinal.java
// (c)2017 MindView LLC: see Copyright.txt
// We make no guarantees that this code is fit for any purpose.
// Visit http://OnJava8.com for more book information.
// "Blank" final fields

class Poppet {
  private int i;
  Poppet(int ii) { i = ii; }
}

public class BlankFinal {
  private final int i = 0; // Initialized final
  private final int j; // Blank final
  private final Poppet p; // Blank final reference
  // Blank finals MUST be initialized in constructor:
  public BlankFinal() {
    j = 1; // Initialize blank final
    p = new Poppet(1); // Init blank final reference
  }
  public BlankFinal(int x) {
    j = x; // Initialize blank final
    p = new Poppet(x); // Init blank final reference
  }
  public static void main(String[] args) {
    new BlankFinal();
    new BlankFinal(47);
  }
}