diff --git a/src/java.base/share/classes/java/lang/reflect/Executable.java b/src/java.base/share/classes/java/lang/reflect/Executable.java
index b808e052fb2..7416cf1d73e 100644
--- a/src/java.base/share/classes/java/lang/reflect/Executable.java
+++ b/src/java.base/share/classes/java/lang/reflect/Executable.java
@@ -196,7 +219,9 @@ String sharedToGenericString(int modifierMask, boolean isDefault) {
      * Returns the {@code Class} object representing the class or interface
      * that declares the executable represented by this object.
      */
-    public abstract Class<?> getDeclaringClass();
+    public Class<?> getDeclaringClass() {
+        return clazz;
+    }
 
     /**
      * Returns the name of the executable represented by this object.
@@ -208,7 +233,9 @@ String sharedToGenericString(int modifierMask, boolean isDefault) {
      * the executable represented by this object}
      * @see #accessFlags
      */
-    public abstract int getModifiers();
+    public int getModifiers() {
+        return modifiers;
+    }
 
     /**
      * {@return an unmodifiable set of the {@linkplain AccessFlag
@@ -266,7 +285,9 @@ public Set<AccessFlag> accessFlags() {
      * represents
      */
     @SuppressWarnings("doclint:reference") // cross-module links
-    public abstract Class<?>[] getParameterTypes();
+    public Class<?>[] getParameterTypes() {
+        return parameterTypes.length == 0 ? parameterTypes : parameterTypes.clone();
+    }
 
     /**
      * Returns the number of formal parameters (whether explicitly
@@ -276,7 +297,9 @@ public Set<AccessFlag> accessFlags() {
      * @return The number of formal parameters for the executable this
      * object represents
      */
-    public abstract int getParameterCount();
+    public int getParameterCount() {
+        return parameterTypes.length;
+    }
 
     /**
      * Returns an array of {@code Type} objects that represent the
@@ -507,7 +530,9 @@ byte[] getTypeAnnotationBytes() {
      * @return the exception types declared as being thrown by the
      * executable this object represents
      */
-    public abstract Class<?>[] getExceptionTypes();
+    public Class<?>[] getExceptionTypes() {
+        return exceptionTypes.length == 0 ? exceptionTypes : exceptionTypes.clone();
+    }
 
     /**
      * Returns an array of {@code Type} objects that represent the
@@ -598,10 +623,7 @@ public boolean isSynthetic() {
      *    the formal and implicit parameters, in declaration order, of
      *    the executable represented by this object
      */
-    public abstract Annotation[][] getParameterAnnotations();
-
-    Annotation[][] sharedGetParameterAnnotations(Class<?>[] parameterTypes,
-                                                 byte[] parameterAnnotations) {
+    public Annotation[][] getParameterAnnotations() {
         int numParameters = parameterTypes.length;
         if (parameterAnnotations == null)
             return new Annotation[numParameters][0];