driver-core/src/main/com/mongodb/BasicDBObjectBuilder.java
public static BasicDBObjectBuilder start(final String key, final Object val) {
        return (new BasicDBObjectBuilder()).add(key, val);
    }
public static BasicDBObjectBuilder start(final String key, final Object val) {
        return (new BasicDBObjectBuilder()).add(key, val);
    }
public static BasicDBObjectBuilder start ( final String key , final Object val ) { return ( new BasicDBObjectBuilder ( ) ) . add ( key , val ) ; }
Creates a builder initialized with the given key/value.

@param key The field name
@param val The value
@return the new builder
Creates a builder initialized with the given key / value .