java - 如何使用 while 循环计算字符串中的特定字符 - Java

Question

我对此非常陌生，虽然我能够使用 for 循环来完成此操作，但分配需要一个 while 循环。我尝试了下面的方法，但它不起作用。请帮忙!

package charcounter;

import java.util.Scanner;

public class CharCounter {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        char userChar = '0';
        String inputEntry = "";
        String inputCharacter = "";
        int foundOccurrences = 0;

        System.out.print("Please enter one or more words: ");
        inputEntry = in.nextLine();

        System.out.print("\nPlease enter one character: ");
        inputCharacter = in.next();
        userChar = inputCharacter.charAt(0);

        while (foundOccurrences < inputEntry.length()) {
            if (userChar == inputEntry.charAt(0)) {

            }

            System.out.println("There is " + foundOccurrences + " occurrence(s) of " + inputCharacter + " in test.");

            foundOccurrences++;
        }

    }

}

Answer 1

类似这样的事情:

        int i = 0;
        while (i < inputEntry.length()) {
            if (userChar == inputEntry.charAt(i++)) {
                foundOccurrences++;
            }
        }
        System.out.println("There is " + foundOccurrences + " occurrence(s) of " + inputCharacter + " in test.");

修复了错误