Java：將List<string>轉換為字符串JavaScriptArray.join()js>["Bill","Bob","Steve"].join(" and ")Bill and Bob and SteveJava有類似的東西嗎？我知道我可以用StringBuilder拼湊一些東西：static public String join(List<String> list, String conjunction){
StringBuilder sb = new StringBuilder();
boolean first = true;
for (String item : list)
{
if (first)
first = false;
else
sb.append(conjunction);
sb.append(item);
}
return sb.toString();}但是，如果類似的東西已經是JDK的一部分，那么這樣做是沒有意義的。
3 回答
BIG陽
TA貢獻1859條經驗 獲得超6個贊
List<String> list = Arrays.asList("foo", "bar", "baz");String joined = String.join(" and ", list); // "foo and bar and baz"List<Person> list = Arrays.asList(
new Person("John", "Smith"),
new Person("Anna", "Martinez"),
new Person("Paul", "Watson "));String joinedFirstNames = list.stream()
.map(Person::getFirstName)
.collect(Collectors.joining(", ")); // "John, Anna, Paul"StringJoiner
繁星點點滴滴
TA貢獻1803條經驗 獲得超3個贊
org.apache.commons.lang.StringUtils.join(list, conjunction);
org.springframework.util.StringUtils.collectionToDelimitedString(list, conjunction);
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