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);
	}
}