Java经典算法40题 – 题目7

【程序7】题目：
输入一行字符，分别统计出其中英文字母、空格、数字和其它字符的个数。

思路：逐个读吧。

package org.sixlab.algorithm40;

import java.util.HashMap;
import java.util.Map;

public class CharacterNumber {
    public static void main(String\[\] args) {
        String testString="Hello World! Hello 123! >-<";
        System.out.println(countNumber(testString));
    }

    private static Map<String, Integer> countNumber(String input) {
        int englishNumber = 0;
        int numberNumber = 0;
        int spaceNumber = 0;
        int otherNumber = 0;

        int length = input.length();

        for (int i = 0; i < length; i++) {
            char tempChar = input.charAt(i);
            if (Character.isDigit(tempChar)) {
                numberNumber++;
            } else if (Character.isSpaceChar(tempChar)) {
                spaceNumber++;
            } else if (Character.isLetter(tempChar)) {
                englishNumber++;
            } else {
                otherNumber++;
            }
        }

        Map<String, Integer> map = new HashMap<>();
        map.put("english", englishNumber);
        map.put("number", numberNumber);
        map.put("space", spaceNumber);
        map.put("other", otherNumber);

        return map;
    }
}