// Set the creative rotation type to optimized.
lineItem.setCreativeRotationType(CreativeRotationType.OPTIMIZED);
// Create the master creative placeholder.
CreativePlaceholder creativeMasterPlaceholder = new CreativePlaceholder();
creativeMasterPlaceholder.setSize(new Size(640, 360, false));
// Create companion creative placeholders.
CreativePlaceholder companionCreativePlaceholder = new CreativePlaceholder();
companionCreativePlaceholder.setSize(new Size(300, 250, false));
// Set companion creative placeholders.
creativeMasterPlaceholder.setCompanions(
new CreativePlaceholder[] {companionCreativePlaceholder});