[英]Object creation across multiple files (Java)
所以我有2個名為Employee.java和Write.java的文件(這兩個文件在同一包中)。 在Employee.java中說
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,我想要創建一個名為temp的Employee類型的對象。 喜歡
public void obtainInfo(Employee temp) {
String firstName = temp.firstName;
String lastName = temp.lastName;
}
但是我收到一條錯誤消息,告訴我它無法在該行中找到該符號。
public void obtainInfo(Employee temp) {
我只是想知道我哪里出錯了,因為我無法在不同文件中創建對象。 盡管它們位於同一程序包中,但我無法訪問它們?
我希望以后能夠合並它,以幫助我通過讀取數組列表來構建文本文件,但是我想首先從讀取對象的一行開始。
確保Write.java的類具有與Employee(IE:Public)相同的訪問級別。 如果這不是問題,我將特別顯示Write.java的代碼,因為這很可能是問題出處。
在我看來,您正在嘗試進行一些設置,以便可以復制Employee並將屬性寫入文本文件。 這不會寫入文本文件,但我認為這可能會為您清除一些問題。
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);
}
}
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