Listlist=new ArrayList<>(); list.add("张三"); list.add("李四"); String name = list.stream().map(String::valueOf).collect(Collectors.joining(",")); System.out.println(name);//输出 张三,李四

Listlist=new ArrayList<>(); list.add("张三"); list.add("李四"); String name = list.stream().map(String::valueOf).collect(Collectors.joining(",")); System.out.println(name);//输出 张三,李四