Mutable List of Float, Immutable List of Float, Revisited
This code seems to work!
package net.coderextreme;
import java.util.ArrayList;
import java.util.List;
import java.util.Arrays;
import java.util.Collections;
import java.lang.Float;
public class NoModFloatArray {
public static final List<Float> FIELDOFVIEW_DEFAULT_VALUE = Collections.unmodifiableList(List.of(-1f,-1f,1f,1f));
public void print(String section, List<Float> 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 NoModFloatArray() {
List<Float> MOD_FIELDOFVIEW = new ArrayList<Float>(FIELDOFVIEW_DEFAULT_VALUE);
print("Modify Pre Immutable Change", MOD_FIELDOFVIEW);
try {
System.out.println("Setting immutable index 0 to 2.0");
FIELDOFVIEW_DEFAULT_VALUE.set(0, 2.0f);
} catch (UnsupportedOperationException ex) {
ex.printStackTrace();
}
print("Modify Post Immutable Change", MOD_FIELDOFVIEW);
System.out.println("seting mutable index 2 to 4.0");
MOD_FIELDOFVIEW.set(2, 4.0f);
print("Post modify non-final", MOD_FIELDOFVIEW);
}
public static void main(String[] args) {
new NoModFloatArray();
System.out.println("---------------------------------------------");
new NoModFloatArray();
}
}
$ java net/coderextreme/NoModFloatArray
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$UnmodifiableList.set(Collections.java:1504)
at net.coderextreme.NoModFloatArray.<init>(NoModFloatArray.java:24)
at net.coderextreme.NoModFloatArray.main(NoModFloatArray.java:35)
Modify Post Immutable Change
Immutable Array FIELDOFVIEW_DEFAULT_VALUE [-1.0, -1.0, 1.0, 1.0]
Mutable Array MOD_FIELDOFVIEW[-1.0, -1.0, 1.0, 1.0]
Compare mutable to immutable true
seting mutable index 2 to 4.0
Post modify non-final
Immutable Array FIELDOFVIEW_DEFAULT_VALUE [-1.0, -1.0, 1.0, 1.0]
Mutable Array MOD_FIELDOFVIEW[-1.0, -1.0, 4.0, 1.0]
Compare mutable to immutable false
---------------------------------------------
Modify Pre Immutable Change
Immutable Array FIELDOFVIEW_DEFAULT_VALUE [-1.0, -1.0, 1.0, 1.0]
Mutable Array MOD_FIELDOFVIEW[-1.0, -1.0, 1.0, 1.0]
Compare mutable to immutable true
Setting immutable index 0 to 2.0
java.lang.UnsupportedOperationException
at java.base/java.util.Collections$UnmodifiableList.set(Collections.java:1504)
at net.coderextreme.NoModFloatArray.<init>(NoModFloatArray.java:24)
at net.coderextreme.NoModFloatArray.main(NoModFloatArray.java:37)
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
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
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