*6.20(计算一个字符串中字母的个数)编写一个方法,使用下面的方法头计算字符串中的字母个数:
public static int countLetters(String s)
编写一个测试程序,提示用户输入字符串,然后显示字符串中的字母个数。
*6.20(Count the letters in a string) Write a method that counts the number of letters in a string using the following header:
public static int countLetters(String s)
Write a test program that prompts the user to enter a string and displays the number of letters in the string.
下面是参考答案代码:
import java.util.Scanner;
public class Ans6_20_page201 {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.print("Enter : ");
String s = input.nextLine();
System.out.println("The number of letters is "+ countLetters(s));
}
public static int countLetters(String s) {
int count = 0;
for (int i = 0;i < s.length();i++) {
if (Character.isLetter(s.charAt(i)))
count++;
}
return count;
}
}
适用Java语言程序设计与数据结构(基础篇)(原书第11版)Java语言程序设计(基础篇)(原书第10/11版)
更多内容