您可以执行以下操作：
savedPlanets.replace(planet.getDisplayName(),"");
理想情况下，我将执行以下解决方案：
Set<String> selectedPlanets = new HashSet<String>();selectedPlanets.add(planet.getDisplayName()); // Whenever a planet is selectedselectedPlanets.remove(planet.getDisplayName()); // Whenever a planet is removed// Prepare a String with all planets StringBuilder savedPlanets = new StringBuilder("");for(String planetName : selectedPlanets ){ savedPlanets.append(planetName).append(",");}// Removing , from the end if any if(savedPlanets.toString().endsWith(",")) finalValue = savedPlanets.substring(0, savedPlanets.length()-1);// finalValue is what you are looking for
