华为OJ 初级：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 Main{
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
String input = sc.nextLine();
sc.close();
int charNum = countChar(input);
int blankNum = countBlank(input);
int num = countNum(input);
int others = input.length() - charNum - num - blankNum;
System.out.println(charNum);
System.out.println(blankNum);
System.out.println(num);
System.out.println(others);
}

private static int countChar(String input) {
int count = 0;
for (int i = 0; i < input.length(); i++) {
if ((input.charAt(i) >= 'a' && input.charAt(i) <= 'z')
|| (input.charAt(i) >= 'A' && input.charAt(i) <= 'Z'))
count++;
}
return count;
}

private static int countBlank(String input) {
int count = 0;
for (int i = 0; i < input.length(); i++) {
if (input.charAt(i) == ' ')
count++;
}
return count;
}

private static int countNum(String input) {
int count = 0;
for (int i = 0; i < input.length(); i++) {
if ((input.charAt(i) >= '0') && (input.charAt(i) <= '9'))
count++;
}
return count;
}
}