[英]How to Choose the string which starts with small letter from a list
如果我有一個包含[StudentName,ResigsterNumber,系,年級,評論]的列表
我如何只選擇那些以小寫字母開頭的單詞。 即(等級和評論)
使用Java 8,這非常簡單:
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]"
您可以檢查每個單詞的第一個字母的ASCII值。 小寫字母的ASCII值介於97到122之間。循環瀏覽列表並將字符串存儲在變量str
int i=str.charAt(0);
if(i>=97 && i<=122){
// this is a word starting with lowercase letter
System.out.println(str)
}
只需遍歷列表,然后選擇1個元素位於'a'
和'z'
之間的字符串
List<String> result=new ArrayList<String>();
for(String str: list){
if(str.charAt(0)>='a' && str.charAt(0)<='z'){
result.add(str);
}
}
這是完整的類,帶有最終輸出:
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);
}
}
只需遍歷元素並使其處於以下條件即可:
boolean hasLowerCase = element.equals(element.toLowerCase());
這將允許您檢查:
if(hasLowerCase){System.out.println(Element is in lowercase)};
if(!hasLowerCase){System.out.println(Element is not in lowercase)};
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
}
}
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