Method isDefault

src/main/java/org/codehaus/groovy/ast/MethodNode.java:286–289

Checks whether this method is a default method. Default methods are public methods in interfaces with no abstract modifier. @return true if this method is a default interface method

()

     * @return true if this method is a default interface method
     */
    public boolean isDefault() {
        return (modifiers & (ACC_ABSTRACT | ACC_PUBLIC | ACC_STATIC)) == ACC_PUBLIC &&
            Optional.ofNullable(getDeclaringClass()).filter(ClassNode::isInterface).isPresent();
    }

    /**
     * Checks whether this method is declared as final.