NetBeans运行Java项目时无法找到Main类问题求助

package com.mycompany.example;

import java.util.Scanner;
import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.IOException;

class Fruits {
    String name;
    double price;
    char quality;
    
    Fruits() {
        // Parameterless constructor
    }
    
    Fruits(String name, double price, char quality) {
        this.name = name;
        this.price = price;
        this.quality = quality;
    }
    
    Fruits(Fruits fruit) {
        this.name = fruit.name;
        this.price = fruit.price;
        this.quality = fruit.quality;
    }
    
    @Override
    public String toString() {
        return "Name: " + name + ", Price: " + price + ", Quality: " + quality;
    }
}

class Dehydrated extends Fruits {
    int quantity;
    boolean inTray;
    
    Dehydrated() {
        // Parameterless constructor
    }
    
    Dehydrated(String name, double price, char quality, int quantity, boolean inTray) {
        super(name, price, quality);
        this.quantity = quantity;
        this.inTray = inTray;
    }
    
    Dehydrated(Dehydrated dehydrated) {
        super(dehydrated);
        this.quantity = dehydrated.quantity;
        this.inTray = dehydrated.inTray;
    }
    
    @Override
    public String toString() {
        return super.toString() + ", Quantity: " + quantity + ", In Tray: " + inTray;
    }
    
    void state() {
        if (inTray) {
            Scanner scanner = new Scanner(System.in);
            System.out.print("Enter name: ");
            name = scanner.nextLine();
            System.out.print("Enter quality: ");
            quality = scanner.next().charAt(0);
        } else {
            System.out.println("State is only available for fruits in the tray.");
        }
    }
}

public class Main {
    public static void main(String[] args) {
        // Creating arrays for each class
        Fruits[] fruitsArray = new Fruits[3];
        Dehydrated[] dehydratedArray = new Dehydrated[3];
        
        // Instantiating objects for the Fruits class using the three constructors
        fruitsArray[0] = new Fruits();
        fruitsArray[1] = new Fruits("Oranges", 4.5, 'B');
        fruitsArray[2] = new Fruits(fruitsArray[1]);
        
        // Instantiating objects for the Dehydrated class using the three constructors
        dehydratedArray[0] = new Dehydrated();
        dehydratedArray[1] = new Dehydrated("Apricots", 7.2, 'A', 20, true);
        dehydratedArray[2] = new Dehydrated(dehydratedArray[1]);
        
        // Calling the state() method for some instances of the Dehydrated class
        dehydratedArray[1].state(); // Will read from keyboard and modify
        dehydratedArray[2].state(); // Will not modify
        
        // Writing the modified instance results to a text file
        try {
            FileWriter writer = new FileWriter("results.txt");
            for (Dehydrated dehydrated : dehydratedArray) {
                writer.write(describeChanges(dehydrated));
            }
            writer.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
        
        // Testing the created methods
        testMethods(fruitsArray, dehydratedArray);
    }
    
    // Method that describes changes for an instance of Dehydrated
    private static String describeChanges(Dehydrated dehydrated) {
        if (dehydrated.inTray) {
            return "Name: " + dehydrated.name + ", Quality: " + dehydrated.quality + "\n";
        } else {
            return ""; // If not in tray, no changes are made
        }
    }
    
    // Method for testing the created methods
    private static void testMethods(Fruits[] fruitsArray, Dehydrated[] dehydratedArray) {
        // Testing display methods
        for (Fruits fruit : fruitsArray) {
            System.out.println(fruit);
        }
        for (Dehydrated dehydrated : dehydratedArray) {
            System.out.println(dehydrated);
        }
        
        // Testing the state() method
        for (Dehydrated dehydrated : dehydratedArray) {
            dehydrated.state();
        }
    }
}

• 强制重新编译项目
  右键项目选择「清理并构建」，彻底清除旧编译缓存和class文件，重新生成编译产物。之后检查项目目录/build/classes/com/mycompany/example/下是否存在Main.class文件——如果没有，说明代码存在编译错误，这是主类找不到的核心原因。

• 修正代码语法错误
  你提供的代码里有HTML转义字符"，Java编译器无法识别，必须替换为标准双引号"。替换后重新编译，否则会直接编译失败，无法生成主类的class文件。

• 确认主类配置正确性
  右键项目→属性→运行，检查「主类」是否选中com.mycompany.example.Main。如果未选中或选错，点击右侧「浏览」按钮，手动定位选择该类。

• 验证文件路径与包声明匹配
  确保Main.java实际存放路径是src/com/mycompany/example/，Java要求文件路径必须和包声明完全对应，否则编译器无法正确识别类的归属包。

• 检查JDK配置有效性
  右键项目→属性→库，确认项目使用的JDK版本已安装且路径未变动。可以尝试切换到另一个可用JDK版本，再重新构建项目。

• 重置NetBeans缓存
  关闭NetBeans，找到缓存目录（一般在用户目录/.netbeans/对应版本号/var/cache），删除其中所有内容，重启NetBeans后重新加载项目并构建。

内容的提问来源于stack exchange，提问作者Tosi Rom