输入一行字符，分别统计出包含英文字母、空格、数字和其它字符的个数

import java.util.Scanner;public class GetNumDifChar {public static void main(String[] args) {Scanner scan = new Scanner(System.in);String str = scan.nextLine();int isLetter = 0;int isSpace = 0;int isDigit = 0;int isOther = 0;for (int i = 0; i < str.length(); i++) {if(Character.isLetter(str.charAt(i)))isLetter++;else if(Character.isSpace(str.charAt(i)))isSpace++;else if(Character.isDigit(str.charAt(i)))isDigit++;else isOther++;}System.out.println(isLetter);System.out.println(isSpace);System.out.println(isDigit);System.out.println(isOther);}}