Java 无法在原始类型 char 上调用 equals(char)

Cannot invoke equals(char) on the primitive type char

提问by Steve Andrews

I'm new to programming and trying to nut out a basic guessing game, but I have this error. Need some help as I've set 'guess' to char, then want to compare it to the array of chars but tried a couple of different approaches but no joy yet.

我是编程新手并试图摆脱一个基本的猜谜游戏，但我有这个错误。需要一些帮助，因为我已将 'guess' 设置为char，然后想将它与字符数组进行比较，但尝试了几种不同的方法，但还没有快乐。

It gives me the error on the if statement at the bottom containing:

它给了我底部 if 语句的错误，其中包含：

(guess.equals(wordContainer[j]))

Thanks in advance.

提前致谢。

My code:

我的代码：

import java.util.Scanner;  

public class GuessingGame {

    public static void main(String args[]) {

        Scanner keyboard = new Scanner(System.in);

        String wordArray[] = {"aardvarks", "determine", "different", "greatness", "miserable", "trappings", "valuables", "xylophone"};

        double rand = Math.random() * 8;
        int x = 0;      
        x = (int)rand;      

        System.out.println(x);

        String word = wordArray[x];
        int wordCount = word.length();

        System.out.println(word);
       // System.out.println(wordCount);

        char wordContainer[] = new char[wordCount];
        char wordHiddenContainer[] = new char[wordCount];

        String input;
        char guess;

        System.out.print("Enter your guess(a-z): ");
        input = keyboard.next();
        guess = input.charAt(0);

        for ( int i = 0 ; i < wordCount ; i++ ) {           
            wordContainer[i] = word.charAt(i);
            wordHiddenContainer[i] = '*';           
        }

        System.out.println(wordContainer);
        System.out.println(wordHiddenContainer);

        for (int j = 0; j <  word.length(); j++ ) {
            if(guess.equals(wordContainer[j])) {                
                wordHiddenContainer[j] = guess;

            }           
        }
    }   
}

采纳答案by Konstantin Yovkov

Primitives are compared with ==. If you convert the chars to the wrapper classes Character, then you can use .equals().

原语与==. 如果将chars转换为包装类Character，则可以使用.equals().

Either change

要么改变

1. char guess;to Character guess;

   or

2. if(guess.equals(wordContainer[j]))to if(guess == wordContainer[j])).

1. char guess;到 Character guess;

   或者

2. if(guess.equals(wordContainer[j]))到if(guess == wordContainer[j]))。

回答by Thirumalai Parthasarathi

equals()is a method that is contained in the Object class and passed on through inheritance to every class that is created in java. And since it is a method, it can be invoked only by objects and not primitives.

equals()是一个包含在 Object 类中的方法，并通过继承传递给在 java 中创建的每个类。由于它是一种方法，因此只能由对象而不是基元调用。

You should compare the variable guesslike this

你应该guess像这样比较变量

if(guess==wordContainer[j]) {

hope it helps.

希望能帮助到你。