src/java/me/topchetoeu/jscript/runtime/Engine.java

@@ -7,7 +7,7 @@ import java.util.function.Supplier;
 
 import me.topchetoeu.jscript.runtime.exceptions.InterruptException;
 
-public class Engine implements EventLoop {
+public final class Engine implements EventLoop {
     private static class Task<T> implements Comparable<Task<?>> {
         public final Supplier<?> runnable;
         public final CompletableFuture<T> notifier = new CompletableFuture<T>();
@@ -74,7 +74,4 @@ public class Engine implements EventLoop {
     public boolean isRunning() {
         return this.thread != null;
     }
-
-    public Engine() {
-    }
 }

src/java/me/topchetoeu/jscript/runtime/Frame.java

@@ -21,7 +21,7 @@ import me.topchetoeu.jscript.runtime.values.functions.CodeFunction;
 import me.topchetoeu.jscript.runtime.values.objects.ObjectValue;
 import me.topchetoeu.jscript.runtime.values.objects.ScopeValue;
 
-public class Frame {
+public final class Frame {
     public static final Key<Frame> KEY = Key.of();
 
     public static enum TryState {

src/java/me/topchetoeu/jscript/runtime/values/KeyCache.java

@@ -5,7 +5,7 @@ import me.topchetoeu.jscript.runtime.values.primitives.NumberValue;
 import me.topchetoeu.jscript.runtime.values.primitives.StringValue;
 import me.topchetoeu.jscript.runtime.values.primitives.SymbolValue;
 
-public class KeyCache {
+public final class KeyCache {
     public final Value value;
     private Integer intCache;
     private Double doubleCache;

src/java/me/topchetoeu/jscript/runtime/values/functions/CodeFunction.java

@@ -5,7 +5,7 @@ import me.topchetoeu.jscript.common.environment.Environment;
 import me.topchetoeu.jscript.runtime.Frame;
 import me.topchetoeu.jscript.runtime.values.Value;
 
-public class CodeFunction extends FunctionValue {
+public final class CodeFunction extends FunctionValue {
     public final FunctionBody body;
     public final Value[][] captures;
     public Environment env;

src/java/me/topchetoeu/jscript/runtime/values/functions/NativeFunction.java

@@ -3,7 +3,7 @@ package me.topchetoeu.jscript.runtime.values.functions;
 import me.topchetoeu.jscript.common.environment.Environment;
 import me.topchetoeu.jscript.runtime.values.Value;
 
-public class NativeFunction extends FunctionValue {
+public final class NativeFunction extends FunctionValue {
     public static interface NativeFunctionRunner {
         Value run(Arguments args);
     }

src/java/me/topchetoeu/jscript/runtime/values/objects/ScopeValue.java

@@ -4,7 +4,7 @@ import me.topchetoeu.jscript.common.environment.Environment;
 import me.topchetoeu.jscript.runtime.values.Value;
 import me.topchetoeu.jscript.runtime.values.Member.FieldMember;
 
-public class ScopeValue extends ObjectValue {
+public final class ScopeValue extends ObjectValue {
     private class VariableField extends FieldMember {
         private int i;