publicclassLetterCounter{publicstaticintcountLetters(Stringinput){char[]charArray=input.toCharArray();intcount=0;for(charc:charArray){if(Character.isLetter(c)){count++;}}returncount;}publicstaticvoidmain(String[]args){Stringinput="Hello World";intletterCount=countLetters(input);System.out.println(...
String someString = "chenmowanger";char someChar = 'e';int count = 0;for (int i = 0; i < someString.length(); i++) {if (someString.charAt(i) == someChar) { count++; }}System.out.println(count);这种方式很直白，但有没有更优雅的呢？有，Java 8 就优雅多了：long count ...
}public static void main(String[] args) {String str="asdmlFDSAGF123455";char[] cs=str.toCharArray();int numCount=0;int UpCount=0;//大写字母个数int LowCount=0;//小写字母个数for(char c:cs){if(c>47&&c<58){numCount++;}else if(c>64&&c<91){UpCount++;}else if(c>96...
publicclassWhileLoopDemo{ publicstaticvoidmain(String[] args){ intcount =1;// 1. 初始化 while(count <=5) {// 2. 终止条件 System.out.println("Count is: "+ count);// 循环体 count++;// 3. 更新循环控制变量 ...
public AbstractStringBuilder append(String str) { if (str == null) return appendNull(); int len = str.length(); ensureCapacityInternal(count + len); str.getChars(0, len, value, count); count += len; return this; } 1)判断拼接的字符串是不是 null,如果是,当做字符串“null”来处理。
public static void main (String [] args) { vowelCount(String [] letters); } private static String [] vowelCount (String [] letters) { String [] letters = new String[5]; for (int i = 0; i < letters.length; i++) { if (letters.charAt(i) == 'A' || letters.charAt(i) ==...
// 创建一个字符串列表List<String>letters=Arrays.asList("a","b","c","d","e");// 使用 reduce 操作拼接字符串列表String result=letters.stream().reduce("",(partialString,element)->partialString+element);// 输出结果System.out.println(result);// abcde ...
2013-07-09 16:15 −public class CaculateCharCount { /** * @description 输入一行字符,分别统计出其中英文字母、空格、数字和其它字符的个数。 * @param args */ public static void main(String[] args) ... 合肥房屋托管 0 21176 输入一行字符,分别统计出其中英文字母、空格、数字和其它字符的个数。
String str="Hello World";if(CharacterisLetter(strcharAtprintln"第一个字符是字母"elseprintln("第一个字符不是字母"} (2).方式二,正则性能差 代码语言:javascript 代码运行次数:0 运行 AI代码解释 String str="你好,Hello World";if(str.matches("^[a-zA-Z].*")){System.out.println("第一个字符是...
1importjava.util.Scanner;23publicclassPofour {4publicstaticvoidmain(String[] args) {5Scanner input =newScanner(System.in);6System.out.println("请你输入一串字符串:");7String s =input.next();8System.out.print("字符串中字母的个数为:"+countLetters(s));9}10publicstaticintcountLetters(String...