java - 跨多个文件创建对象 (Java)

Question

所以我有 2 个名为 Employee.java 和 Write.java 的文件(这两个文件位于同一个包中)。在 Employee.java 中说我有

public class Employee {
    private String firstName = "test";
    private String lastName = "ing";

    public Employee(String first, String last) {
        firstName = first;
        lastName = last;
    }

    public Employee(Employee copy) {
        firstName = copy.firstName;
        lastName = copy.lastName;
    }
}

然后在我的 Write.java 中，我想创建一个名为 temp 的 Employee 类型的对象。喜欢

public void obtainInfo(Employee temp) {
    String firstName = temp.firstName;
    String lastName = temp.lastName;
}

但是我收到一个错误，告诉我它无法在该行中找到该符号。

public void obtainInfo(Employee temp) {

我只是想知道我哪里出了问题，无法在不同的文件中创建对象。尽管它们位于同一个包中，但我无法访问它们？

我希望稍后能够合并它，以帮助我通过读取数组列表来构建文本文件，但我想首先从对象中读取一行开始。

Answer 1

在我看来，您正在尝试进行一些设置，以便可以复制 Employee 并能够将属性写入文本文件。这不会写入文本文件，但我认为它可能会为您清除一些事情。

public class Employee {
    private String firstName;
    private String lastName;

    public Employee(String firstName, String lastName) {
        this.firstName = firstName;
        this.lastName = lastName;
    }

    public Employee(Employee copy) {
        firstName = copy.firstName;
        lastName = copy.lastName;
    }

    public String getFirstName() {
        return firstName;
    }

    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }

    public String getLastName() {
        return lastName;
    }

    public void setLastName(String lastName) {
        this.lastName = lastName;
    }

    @Override
    public String toString() {
        final StringBuilder sb = new StringBuilder();
        sb.append("Employee");
        sb.append("{firstName='").append(firstName).append('\'');
        sb.append(", lastName='").append(lastName).append('\'');
        sb.append('}');
        return sb.toString();
    }
}

TestClass.java

public class TestClass {

    public static void main(String[] args){
        //First we have to have one to copy
        Employee emp = new Employee("Joe", "Dirt");

        //Now we have a copy
        Employee emp2 = new Employee(emp);

        //Calls the Employee.toString() method and sends it to System.out
        System.out.println("Employee 1 : " + emp);
        System.out.println("Copy of Employee 1 : " + emp2);
    }
}