如何将list中字符串采用逗号拼接呢?
下文笔者讲述list中字符串采用逗号拼接的方法分享,如下所示
list字符串逗号拼接的实现思路
方式1: 借助工具类 如:StringUtils.join 方式2: 借助for循环进行拼接例:List中字符串拼接的示例分享
public class TestClass { private static String[] array = {"java265.com", "java我最爱好", "这是最好的java网站"}; private static String str; public static void main(String[] args) { List<String> list = new ArrayList<>(); for (int i = 0; i < array.length; i++) { list.add(array[i]); } /** * * 将集合用字符串,逗号隔开拼接 * */ //第一种方法(灵活,可以用逗号隔开,用|线隔开) str = StringUtils.join(list, ","); System.out.println("第一种方法" + str); //第二种方法 str = listToString1(list); System.out.println("第二种方法" + str); //第三种方法(灵活,可以用逗号隔开,用|线隔开) str = listToString2(list, ','); System.out.println("第三种方法" + str); //第四种方法 str = listToString3(list, ","); System.out.println("第四种方法" + str); Separator separator=new Separator(","); //第五种方法 str = listToString4(list, separator ); System.out.println("第五种方法"+str); } public static String listToString1(List<String> list) { StringBuilder sb = new StringBuilder(); if (list != null && list.size() > 0) { for (int i = 0; i < list.size(); i++) { if (i < list.size() - 1) { sb.append(list.get(i) + ","); } else { sb.append(list.get(i)); } } } return sb.toString(); } public static String listToString2(List list, char separator) { StringBuilder sb = new StringBuilder(); for (int i = 0; i < list.size(); i++) { sb.append(list.get(i)).append(separator); } return list.isEmpty() ? "" : sb.toString().substring(0, sb.toString().length() - 1); } public static String listToString3(List list, String separator) { StringBuilder sb = new StringBuilder(); for (int i = 0; i < list.size(); i++) { sb.append(list.get(i)); if (i < list.size() - 1) { sb.append(separator); } } return sb.toString(); } public static class Separator { private String next = ""; private String separator; public Separator(String separator) { this.separator = separator; } public String get() { String result = next; next = separator; return result; } } public static String listToString4(List<String> list, Separator separator) { StringBuilder sb = new StringBuilder(); for (String s : list) { if (s != null && !"".equals(s)) { sb.append(separator.get()).append(s); } } return sb.toString(); }
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