[x3d-public] Better approachs, was: Re: Java SOCKS! jsail/Navigation/OrthoViewpoint.java in X3DJSAIL

[John Carlson]

Most recent version as of 3:08 AM. Saved a lot on memory, I had tried
before, and got errors, but here goes.  Note the difference in the mutable
list in the two runs.

Hopefully, this version will do any number of instantiations, which may
also be idepotent, if you don't change the underlying array.

package net.coderextreme;

import java.util.ArrayList;
import java.util.List;
import java.util.Arrays;
import java.util.Collections;

public class NoModDoubleArray {
    private static final double[] DOUBLE_ARRAY_FIELDOFVIEW_DEFAULT_VALUE =
new double [] {-1f,-1f,1f,1f};
    public static final List<Double> NOMOD_FIELDOFVIEW_DEFAULT_VALUE =
Collections.unmodifiableList(Arrays.asList(Arrays.stream(DOUBLE_ARRAY_FIELDOFVIEW_DEFAULT_VALUE).boxed().toArray(Double[]::new)));
    public NoModDoubleArray() {
      List<Double> MOD_FIELDOFVIEW =
Arrays.asList(Arrays.stream(DOUBLE_ARRAY_FIELDOFVIEW_DEFAULT_VALUE).boxed().toArray(Double[]::new));
     System.out.println("Immutable Array "+NOMOD_FIELDOFVIEW_DEFAULT_VALUE);
     System.out.println("Mutable Array "+MOD_FIELDOFVIEW);
     try {
      System.out.println("Setting immutable index 0 to 0.0");
      NOMOD_FIELDOFVIEW_DEFAULT_VALUE.set(0, 0.0);
     } catch (UnsupportedOperationException ex) {
      ex.printStackTrace();
     }
    System.out.println("Immutable Array "+NOMOD_FIELDOFVIEW_DEFAULT_VALUE);
    System.out.println("Mutable Array "+MOD_FIELDOFVIEW);

    System.out.println();
    System.out.println("Setting double array index 0 to 0.0");

###############  This is a very BAD thing to do.
    DOUBLE_ARRAY_FIELDOFVIEW_DEFAULT_VALUE[0] = 0.0;
    System.out.println("Immutable Array "+NOMOD_FIELDOFVIEW_DEFAULT_VALUE);
    System.out.println("Mutable Array "+MOD_FIELDOFVIEW);
    System.out.println("Compare mutable to immutable
"+MOD_FIELDOFVIEW.equals(NOMOD_FIELDOFVIEW_DEFAULT_VALUE));

     System.out.println();
     System.out.println("Setting mutable index 1 to 0.0");
    MOD_FIELDOFVIEW.set(1, 0.0);
    System.out.println("Immutable Array "+NOMOD_FIELDOFVIEW_DEFAULT_VALUE);
    System.out.println("Mutable Array "+MOD_FIELDOFVIEW);
    System.out.println("Compare mutable to immutable
"+MOD_FIELDOFVIEW.equals(NOMOD_FIELDOFVIEW_DEFAULT_VALUE));
  }
  public static void main(String[] args) {
      new NoModDoubleArray();
      System.out.println("---------------------------------------------");
      new NoModDoubleArray();
  }
}
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