Should you combine Bali, Java and Lombok in one trip?
You can combine Bali, Java and Lombok, but only with enough days and a tolerance for movement. Bali plus Lombok is easier; Bali plus Java is richer in temples and volcanoes; all three need a route that can breathe.
Answer
Bali, Java and Lombok can make a strong Indonesia route, but they are not three simple neighbours with identical logistics. Java brings Yogyakarta, temples, trains and volcano alarms; Bali brings traffic, temples, food and beach bases; Lombok brings a quieter, rougher-edged island mood. Combining all three makes sense when you have enough time to give each a purpose. In a shorter trip, choose the pairing that matches the reason you are travelling: Bali and Lombok for island time, Bali and Java for culture and volcanoes. Add all three only when you are not already bargaining away rest days.