Jacobs argued that's not the case. Google "strongly encourages" developers not to implement their own code, the Oracle attorney said.

"We see both companies aiming at very similar things. We aim at Java compatibility, they aim at Android compatibility," Jacobs said, again stressing similarities between the two models.

Alsup told the lawyers they had done "a very good job." Weingaertner and Jacobs both declined to comment after the hearing.