StringBuilder builder = new StringBuilder();for (int i = 0; i < list.size(); i++) { builder.append(list.get(i));builder.append(",");} String substring = builder.substring(0, builder.length() - 1);System.out.println("循环遍历转化后的字符串 : " + substring);} 打印输出结果：循环...
public static void main(String[] args) { // 示例数据:List<String[]> List<String[]> listOfArrays = new ArrayList<>(); listOfArrays.add(new String[]{"a", "b", "c"}); listOfArrays.add(new String[]{"d", "e"}); listOfArrays.add(new String[]{"f"}); // 转换为 List<Strin...
1.List转String数组 方法一: //先准备一个List List<String> testList=new ArrayList<>(); testList.add("a"); testList.add("b"); testList.add("c"); //List转String String[] strs1=testList.toArray(new String[testList.size()]); for(String s:strs1){ System.out.println(s); } 方法...
下面是代码示例: importjava.util.List;importjava.util.stream.Collectors;publicclassStringListReplace{publicstaticvoidmain(String[]args){List<String>list=List.of("apple","banana","cherry","date");List<String>replacedList=list.stream().map(s->s.equals("banana")?"orange":s).collect(Collectors.t...
在Java中,List和String之间的转换是常见的操作。下面我将分别展示如何将List转换为String,以及如何将String转换为List,并提供测试代码和示例用法。 1. List转换为String 要将List转换为String,可以使用String.join方法(Java 8及以上版本)来连接List中的元素。下面是一个示例代码: java import java.util.Arrays; import...
String result = ""; for(int i=0;i<list.size();i++){ if(i<list.size()-1){ sb.append(list.get(i)); sb.append(","); }else{ sb.append(list.get(i)); } } result = sb.toString(); return result ; //or 第二种方式: ...
String 转 List<Long> String string = "1, 2, 3, 4";List<Long> list = Arrays.asList(string.split(",")).stream().map(s -> Long.parseLong(s.trim())).collect(Collectors.toList());List<Long> 转 String String str = Arrays.toString(listIds.toArray()); //[1,2,3,3,4]
String[]arr=newString[]{1,2,3,4,5};System.out.println(Arrays.toString(arr)); List转String #java8 List<String>lists=Arrays.asList("1","2","3","4","5");#方法一 String str1=String.join(",",lists);#方法二 String str2=lists.stream().collect(Collectors.joining(",")) ...
String blackUids = "[1,2,3,4]"; List<Long> ids = JSONObject.parseArray(blackUids, Long.class); 将逗号分隔字符串转为list List<Long> uids = Arrays.asList(blackListUids.split(",")).stream().map(uid -> NumberUtils.toLong(uid)).collect(Collectors.toList()); 将字符串转为数组 ...
String join = StringUtils.join(list, "-"); //String.join() String str = String.join(",", list); //遍历list集合存入StringBuilder StringBuilder sb = new StringBuilder(); for(int i = 0;i < list.size();i++){ sb.append(list.get(i)); ...