Question

如果我有一个包含[StudentName，ResigsterNumber，Department，grade，comment]

的列表

如何只选择以小写字母开头的单词。即（评分和评论）

Answer 1

使用Java 8非常简单：

List<String> list = Arrays.asList("StudentName", "Department", "grade", "comment");

List<String> filteredList = list.stream()
    .filter(s -> Character.isLowerCase(s.charAt(0)))
    .collect(Collectors.toList());

System.out.println(filteredList); // prints "[grade, comment]"

Answer 2

您可以检查每个单词的第一个字母的ASCII值。小写字母的ASCII值介于97到122之间。循环遍历列表并将String存储在变量str

中

int i=str.charAt(0);
if(i>=97 && i<=122){
      // this is a word starting with lowercase letter
      System.out.println(str)
}

Answer 3

只需遍历列表并选择1个元素位于'a'和'z'之间的字符串

 List<String> result=new ArrayList<String>();
 for(String str: list){
     if(str.charAt(0)>='a' && str.charAt(0)<='z'){
         result.add(str);
     }
 }

Answer 4

这是打印出最终输出的完整类：

    public class Test {
        public static void main(String[] args) {
            String[] testNames = new String[] { "StudentName", "ResigsterNumber", "Department", "grade", "comment" };

            List<String> names = new ArrayList<>();
            Arrays.asList(testNames).forEach((testCh) -> {
                if (testCh != null && !testCh.isEmpty() && Character.isLowerCase(testCh.charAt(0))) {
                    names.add(testCh);
                }
            });

            System.out.println(names);
        }
    }

Answer 5

只需循环遍历元素并将它们置于以下条件：

boolean hasLowerCase = element.equals(element.toLowerCase());

这将允许您检查：

if(hasLowerCase){System.out.println(Element is in lowercase)};
if(!hasLowerCase){System.out.println(Element is not in lowercase)};

Answer 6

for (String l : list){
    char character = l.charAt(0); // This gives the first character
    if (Character.isLowerCase(character)){
        // proceed with list element with small letter found
    }
}

如何选择以列表中的小写字母开头的字符串

6 个答案: