第六章第二十三题（指定字符的出现次数）(Occurrences of a specified character) - 编程练习题答案

*6.23（指定字符的出现次数）使用下面的方法头编写一个方法，找到一个字符串中指定字符的出现次数。

public static int count(String str, char a)

例如，count(“Welcome”,‘e’)返回2。编写一个测试程序，提示用户输入一个字符串以及一个字符，显示该字符在字符串中出现的次数。

*6.23(Occurrences of a specified character)Write a method that finds the number of occurrences of a specified character in a string using the following header:

public static int count(String str, char a)

For example, count(“Welcome”, ‘e’) returns 2. Write a test program that prompts the user to enter a string followed by a character then displays the number of occurrences of the character in the string.

下面是参考答案代码:

// https://cn.fankuiba.com
import java.util.Scanner;

public class Ans6_23_page202 {
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        System.out.print("Enter a string and a character: ");
        String aStr = input.next();
        char aChar = input.next().charAt(0);
        System.out.println(count(aStr,aChar));
    }
    public static int count(String str, char a) {
        int count = 0;
        for (int i = 0; i < str.length(); i ++) {
            if (str.charAt(i) == a)
                count++;
        }
        return count;
    }
}

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