If you are using a standard 240x320 patched .jar file, the controls are typically: Navigation keys / 2, 4, 6, 8. Cut / Interact: Center Select key / 5.
If you'd like to dive deeper into retro mobile gaming, let me know: What or emulator you are using cut the rope java games 240x320 patched
Because these are legacy files, they are mostly hosted on community archives and "abandonware" sites: If you are using a standard 240x320 patched