java字符串练习题4、统计一行字符串中所有的字符类型数量

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package com.item.action;
import java.util.Scanner;
public class Demo {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    // 需要扫一行，包括空格，故而使用nextLine()
    String str = sc.nextLine();
    sc.close();
    // 将字符串转换为字符数组
    char[] array = str.toCharArray();
    int low = 0;
    int up = 0;
    int num = 0;
    int space = 0;
    int other = 0;
    for (char c : array) {
      if (c >= 'a' && c <= 'z') {
        low++;
      } else if (c >= 'A' && c <= 'Z') {
        up++;
      } else if (c >= '0' && c <= '9') {
        num++;
      } else if (c == ' ') {
        space++;
      } else {
        other++;
      }
    }
    System.out.println("小写字母有：" + low);
    System.out.println("大写字母有：" + up);
    System.out.println("数字有：" + num);
    System.out.println("空格有：" + space);
    System.out.println("其他字符有：" + other);
  }
}

package com.item.action;
import java.util.Scanner;
public class Demo {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    // 需要扫一行，包括空格，故而使用nextLine()
    String str = sc.nextLine();
    sc.close();
    // 将字符串转换为字符数组
    char ch[] = str.toCharArray();
    int zifu = 0;
    int num = 0;
    int space = 0;
    int other = 0;
    for (int i = 0; i < str.length(); i++) {
      if (Character.isLetter(ch[i])) {
        zifu++;
      } else if (Character.isDigit(ch[i])) {
        num++;
      } else if (Character.isWhitespace(ch[i])) {
        space++;
      } else {
        other++;
      }
    }
    System.out.println("字母数有：" + zifu);
    System.out.println("数字有：" + num);
    System.out.println("空格有：" + space);
    System.out.println("其他字符有：" + other);
  }
}