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一、List转String的方法 将一个Java集合List转换为String方法比较多,可以使用String.join()、StringBuilder、Stream流等方法。下面举几个常用的示例:
将一个Java集合List转换为String方法比较多,可以使用String.join()、StringBuilder、Stream流等方法。下面举几个常用的示例:
import java.util.ArrayList;import java.util.List;public class ListToStringExample { public static void main(String[] args) { List<String> myList = new ArrayList<>(); myList.add("apple"); myList.add("banana"); myList.add("orange"); String result = String.join(",", myList); System.out.println(result); }}
javaCopy Codeimport java.util.ArrayList;import java.util.List;public class ListToStringExample { public static void main(String[] args) { List<String> myList = new ArrayList<>(); myList.add("apple"); myList.add("banana"); myList.add("orange"); StringBuilder stringBuilder = new StringBuilder(); for (int i = 0; i < myList.size(); i++) { stringBuilder.append(myList.get(i)); if (i != myList.size() - 1) { stringBuilder.append(","); } } String result = stringBuilder.toString(); System.out.println(result); }}
javaCopy Codeimport java.util.ArrayList;import java.util.List;import java.util.stream.Collectors;public class ListToStringExample { public static void main(String[] args) { List<String> myList = new ArrayList<>(); myList.add("apple"); myList.add("banana"); myList.add("orange"); String result = myList.stream().collect(Collectors.joining(",")); System.out.println(result); }}
StringUtils
类javaCopy Codeimport org.apache.commons.lang3.StringUtils;import java.util.ArrayList;import java.util.List;public class ListToStringExample { public static void main(String[] args) { List<String> myList = new ArrayList<>(); myList.add("apple"); myList.add("banana"); myList.add("orange"); String result = StringUtils.join(myList, ","); System.out.println(result); }}
String.split()
方法javaCopy Codeimport java.util.ArrayList;import java.util.Arrays;import java.util.List;public class StringToListExample { public static void main(String[] args) { String str = "apple,banana,orange"; List<String> myList = new ArrayList<>(Arrays.asList(str.split(","))); System.out.println(myList); }}
需要注意的是,Arrays.asList()
方法返回的是一个固定大小的列表,不能进行添加或删除元素的操作。如果您需要对列表进行修改操作,可以使用new ArrayList<>(Arrays.asList(...))
来创建一个新的可修改的列表。
Stream
javaCopy Codeimport java.util.ArrayList;import java.util.Arrays;import java.util.List;import java.util.stream.Collectors;public class StringToListExample { public static void main(String[] args) { String str = "apple,banana,orange"; List<String> myList = Arrays.stream(str.split(",")) .collect(Collectors.toList()); System.out.println(myList); }}
StringUtils
类javaCopy Codeimport org.apache.commons.lang3.StringUtils;import java.util.ArrayList;import java.util.List;public class StringToListExample { public static void main(String[] args) { String str = "apple,banana,orange"; List<String> myList = new ArrayList<>(StringUtils.split(str, ",")); System.out.println(myList); }}
javaCopy Codeimport java.util.ArrayList;import java.util.List;import java.util.regex.Matcher;import java.util.regex.Pattern;public class StringToListExample { public static void main(String[] args) { String str = "apple,banana,orange"; List<String> myList = new ArrayList<>(); Pattern pattern = Pattern.compile(","); Matcher matcher = pattern.matcher(str); int startPos = 0; while (matcher.find()) { String item = str.substring(startPos, matcher.start()); myList.add(item); startPos = matcher.end(); } String lastItem = str.substring(startPos); myList.add(lastItem); System.out.println(myList); }}
来源地址:https://blog.csdn.net/m0_56286631/article/details/131727010
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本文标题: List转换String,String转List的几种方法
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