src/share/classes/java/lang/reflect/Method.java

*** 502,511 ****
--- 502,527 ----
      @Override
      public boolean isSynthetic() {
          return super.isSynthetic();
      }
  
+     /**
+      * Returns {@code true} if this method is a default
+      * method; returns {@code false} otherwise.
+      *
+      * A default method is a non-abstract method, that is, a method
+      * with a body, declared in an interface type.
+      *
+      * @return true if and only if this method is a default
+      * method as defined by the Java Language Specification.
+      * @since 1.8
+      */
+     public boolean isDefault() {
+         return (getModifiers() & Modifier.ABSTRACT) == 0 &&
+             getDeclaringClass().isInterface();
+     }
+ 
      // NOTE that there is no synchronization used here. It is correct
      // (though not efficient) to generate more than one MethodAccessor
      // for a given Method. However, avoiding synchronization will
      // probably make the implementation more scalable.
      private MethodAccessor acquireMethodAccessor() {