class Builder {

        private String content;
        private String name;

        private Builder() {
        }

        public Builder content(String content) {<FILL_FUNCTION_BODY>}

        public Builder name(String name) {
            this.name = name;
            return this;
        }

        public UserMessage build() {
            return new UserMessage(this);
        }
    }

            if (content != null) {
                this.content = content;
            }
            return this;
        
<no_super_class>