在另一个类（同一个包）中使用自定义类

Question

我刚开始使用Java，到处搜索，但无论出于何种原因都无法找到解决方案。我的问题对我来说似乎很简单：我在同一个文件夹中有两个类，该文件夹是我的包，为了说明：

packageE/Class1.java
packageE/Class2.java

我需要在第2类中创建第1类的实例，但它就是不起作用。这是一个示例：

文件路径：packageE/Class1.java

package packageE
public class Class1 {... something ...}

文件路径：packageE/Class2.java

package packageE
public class Class2 {
    public void main (String[] args) {
        Class1 object = new Class1();
    } 

我得到这个错误

Class2.java:52: error: cannot find symbol

                    Class1 object = new Class1();
                    ^
  symbol:   class Class1

  location: class Class2

Class2.java:52: error: cannot find symbol

                    Class1 object = new Class1();
                                                        ^
  symbol:   class Class1

  location: class Class2

根据要求，完整的源代码：注：class1=ClientIndividual，class2=涉众

第一个文件

package substitutiva;
import java.util.ArrayList;
import java.util.Scanner;

public class Stakeholders {
    static ArrayList<Object> companyList = new ArrayList<>();
    ArrayList<Object> individualList = new ArrayList<>();
    ArrayList<Object> employeeList = new ArrayList<>();

    public static void addToRegistry (Object person) {
        System.out.println(person.getClass());
        companyList.add(person);
    }

    public static void main (String[] args) {
        Scanner read = new Scanner(System.in);
        
        // select action
        String selectedAction = "";
        while (selectedAction != "1" && selectedAction != "2") {
            System.out.println("Selecione uma ação:");
            System.out.print("1. Cadastrar");
            System.out.println("2. Listar registros");
            selectedAction = read.nextLine();
            
            if (selectedAction != "1" && selectedAction != "2") {
                System.out.println("Opção indisponível! \n");
            }
        }

        // select person
        String selectedOption = "";
        while (selectedOption != "1" && selectedOption != "2" && selectedOption != "3") {
            System.out.println("Qual tipo de pessoa deseja acessar?");
            System.out.println("1. Funcionário");
            System.out.println("2. Cliente PF");
            System.out.println("3. Cliente PJ");
            selectedOption = read.nextLine();
            
            if (selectedOption != "1" && selectedOption != "2" && selectedOption != "3") {
                System.out.println("Opção indisponível! \n");
            }
        }

        // register
        if (selectedAction == "1") {
            switch (selectedOption) {
                case "1":
                    
                    break;
                case "2":
                    ClientIndividual personObject = new ClientIndividual();
                    addToRegistry(personObject);
                    break;
                case "3":
                
                    break;

                default:
                    break;
            }
        }

        // list
        else if (selectedAction == "2") {
            switch (selectedOption) {
                case "1":
                    break;
                case "2":
                    break;
                case "3":
                    break;
                
                default:
                    break;
            }
        }
        

        read.close();
    }

}

第二个文件

package substitutiva;

import java.util.Scanner;

public class ClientIndividual implements Person {
    String name;
    String cpf;

    @Override
    public void registerPerson() {
        Scanner read = new Scanner(System.in);
        
        System.out.println("Nome: ");
        this.name = read.nextLine();

        System.out.println("CPF: ");
        this.cpf = read.nextLine();

        read.close();
    }

    // constructor
    public ClientIndividual(){};

    // getters & setters
    public String getName() {
        return this.name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getCpf() {
        return this.cpf;
    }

    public void setCpf(String cpf) {
        this.cpf = cpf;
    }

}

第三个文件（接口）

package substitutiva;

public interface Person {
    public void registerPerson ();
}

原始错误

Stakeholders.java:52: error: cannot find symbol
                    ClientIndividual personObject = new ClientIndividual();
                    ^
  symbol:   class ClientIndividual
  location: class Stakeholders
Stakeholders.java:52: error: cannot find symbol
                    ClientIndividual personObject = new ClientIndividual();
                                                        ^
  symbol:   class ClientIndividual
  location: class Stakeholders

Answer 1

看起来您正在通过javac手动编译

将工作文件夹更改为您的文件所在的根文件夹，而不是替代文件，并使用javac替代文件/Stakeholders.java命令进行编译