java拼接逗号的四种方式

1.使用String.join　　

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List<String> list = new ArrayList<>(Arrays.asList("1","2","3","4","5")); String result = String.join(",",list); System.out.println(result);

　　

2.使用stream

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List<String> list = new ArrayList<>(Arrays.asList("1","2","3","4","5"));        String result2 = list.stream().collect(Collectors.joining(",")); System.out.println(result2);

　　

3.使用StringBuffer

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StringBuffer sb = new StringBuffer(); for(String str : list){     sb.append(str).append(","); } String result3 = sb.toString().substring(0,sb.length()-1); System.out.println(result3);

　　

4.使用for

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List<String> list = new ArrayList<>(Arrays.asList("1","2","3","4","5")); String result4 = ""; for(int i = 0;i < list.size();i++){     if(i == list.size() - 1){         result4 += list.get(i);     }else{         result4 += list.get(i) + ",";     } } System.out.println(result4);