Blank final fields

 
// : c06:BlankFinal.java
// "Blank" final fields.
// From 'Thinking in Java, 3rd ed.' (c) Bruce Eckel 2002
// www.BruceEckel.com. See copyright notice in CopyRight.txt.

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 the constructor:
  public BlankFinal() {
    j = 1; // Initialize blank final
    p = new Poppet(1); // Initialize blank final reference
  }

  public BlankFinal(int x) {
    j = x; // Initialize blank final
    p = new Poppet(x); // Initialize blank final reference
  }

  public static void main(String[] args) {
    new BlankFinal();
    new BlankFinal(47);
  }
} ///:~

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Blank final fields : Final « Class « Java

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