java - 随机数无法解析为类型 - Java 本身的拼写错误

Question

已关闭。这个问题是 not reproducible or was caused by typos 。目前不接受答案。

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这个问题是由拼写错误或无法再重现的问题引起的。虽然类似的问题可能是 on-topic在这里，这个问题的解决方式不太可能帮助 future 的读者。

已关闭 6 年前。

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我已重新输入 Java fortune telling program. 的 LinkedIn 学习 Material

显然，我在随机关键字中没有拼写错误，但 Java 显示了有关 Radnom 的运行时错误。有人可以告诉我什么会导致这个错误吗？

错误:

Exception in thread "main" java.lang.Error: Unresolved compilation problems:

Radnom cannot be resolved to a type

Type mismatch: cannot convert from String to ArrayList

Syntax error, insert "Finally" to complete TryStatement at customPrograms.FortuneTeller.main(FortuneTeller.java:15)

图像证明:

我的代码:

package customPrograms;
import java.util.Random;
import java.util.Scanner;
import java.util.ArrayList;
import java.io.*;

public class FortuneTeller {

    public static void main(String[] args) {
        File inputFile = new File("answers.txt");
        ArrayList<String> answers = new ArrayList<String>();
        String answer, response = "y";
        Random rand = new Random();
        System.out.println(rand);
        try {
            Scanner input = new Scanner(inputFile);
            while(input.hasNextLine())
            {
                answer = input.nextLine();
                answers.add(answer);
            }
        } catch(Exception e) {
            System.out.println("The input file \"answers.txt\" was not found." );
            System.out.println(e.toString());
        }

        Scanner in = new Scanner(System.in);
        while (response.equalsIgnoreCase("y"))
        {
            System.out.println("The fortune teller is ready for you \n"
                    + "Please think about question in your mind \n and hit enter for your reply");
        }
        in.nextLine();
        System.out.println("The fortune teller says: \n" +  answers.get(rand.nextInt(answers.size())) + 
                "\"\n");
        System.out.println("Do you have another question? (y/n)");
        response = in.nextLine();
    }
}

Answer 1

只要第15行是:

Random rand = new Random();

我想我已经弄清楚你的项目中发生了什么:你没有 .class文件与 .java 同步来源。

<小时/>

解决方案

在项目菜单中:

选择构建项目选项。

标记自动构建后以保持文件同步。