Mutable double Arrays, Immutable List of Double in Java

Demo of mutable double arrays an immutable Double Lists. Works, AFAICT


package net.coderextreme;


import java.util.ArrayList;

import java.util.List;

import java.util.Arrays;

import java.util.Collections;

import java.lang.Double;


public class NoModDoubleArray {

private static final double[] DOUBLE_ARRAY_FIELDOFVIEW_DEFAULT_VALUE = new double [] {-1f,-1f,1f,1f};

public static final List<Double> FIELDOFVIEW_DEFAULT_VALUE = Collections.unmodifiableList(Arrays.asList(Arrays.stream(DOUBLE_ARRAY_FIELDOFVIEW_DEFAULT_VALUE).boxed().toArray(Double[]::new)));

public void print(String section, List<Double> MOD_FIELDOFVIEW) {

System.out.println();

System.out.println(section);

System.out.println("Immutable Array FIELDOFVIEW_DEFAULT_VALUE "+FIELDOFVIEW_DEFAULT_VALUE);

System.out.println("Mutable Array MOD_FIELDOFVIEW"+MOD_FIELDOFVIEW);

System.out.println("Compare mutable to immutable "+MOD_FIELDOFVIEW.equals(FIELDOFVIEW_DEFAULT_VALUE));

System.out.println();

}

public NoModDoubleArray() {

List<Double> MOD_FIELDOFVIEW = Arrays.asList(Arrays.stream(DOUBLE_ARRAY_FIELDOFVIEW_DEFAULT_VALUE).boxed().toArray(Double[]::new));

print("Modify Pre Immutable Change", MOD_FIELDOFVIEW);

try {

System.out.println("Setting immutable index 0 to 2.0");

FIELDOFVIEW_DEFAULT_VALUE.set(0, 2.0);

} catch (UnsupportedOperationException ex) {

ex.printStackTrace();

}

print("Modify Post Immutable Change", MOD_FIELDOFVIEW);


System.out.println("setting base mutable index 1 to 3.0");

DOUBLE_ARRAY_FIELDOFVIEW_DEFAULT_VALUE[1] = 3.0;

print("Post modify Changing base mutable", MOD_FIELDOFVIEW);


System.out.println("seting mutable index 2 to 4.0");

MOD_FIELDOFVIEW.set(2, 4.0);

print("Post modify non-final", MOD_FIELDOFVIEW);

}

public static void main(String[] args) {

new NoModDoubleArray();

System.out.println("---------------------------------------------");

new NoModDoubleArray();

}

}



$ java net/coderextreme/NoModDoubleArray

Modify Pre Immutable Change
Immutable Array FIELDOFVIEW_DEFAULT_VALUE [-1.0, -1.0, 1.0, 1.0]
Mutable Array MOD_FIELDOFVIEW[-1.0, -1.0, 1.0, 1.0]
Compare mutable to immutable true

Setting immutable index 0 to 2.0
java.lang.UnsupportedOperationException
        at java.base/java.util.Collections$UnmodifiableList.set(Collections.java:1504)
        at net.coderextreme.NoModDoubleArray.<init>(NoModDoubleArray.java:25)
        at net.coderextreme.NoModDoubleArray.main(NoModDoubleArray.java:40)

Modify Post Immutable Change
Immutable Array FIELDOFVIEW_DEFAULT_VALUE [-1.0, -1.0, 1.0, 1.0]
Mutable Array MOD_FIELDOFVIEW[-1.0, -1.0, 1.0, 1.0]
Compare mutable to immutable true

setting base mutable index 1 to 3.0

Post modify Changing base mutable
Immutable Array FIELDOFVIEW_DEFAULT_VALUE [-1.0, -1.0, 1.0, 1.0]
Mutable Array MOD_FIELDOFVIEW[-1.0, -1.0, 1.0, 1.0]
Compare mutable to immutable true

seting mutable index 2 to 4.0

Post modify non-final
Immutable Array FIELDOFVIEW_DEFAULT_VALUE [-1.0, -1.0, 1.0, 1.0]
Mutable Array MOD_FIELDOFVIEW[-1.0, -1.0, 4.0, 1.0]
Compare mutable to immutable false

---------------------------------------------

Modify Pre Immutable Change
Immutable Array FIELDOFVIEW_DEFAULT_VALUE [-1.0, -1.0, 1.0, 1.0]
Mutable Array MOD_FIELDOFVIEW[-1.0, 3.0, 1.0, 1.0]
Compare mutable to immutable false

Setting immutable index 0 to 2.0
java.lang.UnsupportedOperationException
        at java.base/java.util.Collections$UnmodifiableList.set(Collections.java:1504)
        at net.coderextreme.NoModDoubleArray.<init>(NoModDoubleArray.java:25)
        at net.coderextreme.NoModDoubleArray.main(NoModDoubleArray.java:42)

Modify Post Immutable Change
Immutable Array FIELDOFVIEW_DEFAULT_VALUE [-1.0, -1.0, 1.0, 1.0]
Mutable Array MOD_FIELDOFVIEW[-1.0, 3.0, 1.0, 1.0]
Compare mutable to immutable false

setting base mutable index 1 to 3.0

Post modify Changing base mutable
Immutable Array FIELDOFVIEW_DEFAULT_VALUE [-1.0, -1.0, 1.0, 1.0]
Mutable Array MOD_FIELDOFVIEW[-1.0, 3.0, 1.0, 1.0]
Compare mutable to immutable false

seting mutable index 2 to 4.0

Post modify non-final
Immutable Array FIELDOFVIEW_DEFAULT_VALUE [-1.0, -1.0, 1.0, 1.0]
Mutable Array MOD_FIELDOFVIEW[-1.0, 3.0, 4.0, 1.0]
Compare mutable to immutable false

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