import java.util.*;
import java.util.ArrayList;
class Employee{
int eid;
String eName;
String eAddr;
int eSalary;
public Employee(int eid,String eName,String eAddr,int eSalary){
this.eid = eid;
this.eName = eName;
this.eAddr = eAddr;
this.eSalary=eSalary;
}
}
class EmployeeDB{
ArrayList<Employee> al = new ArrayList<Employee>();
public boolean addEmployee(Employee e){
return al.add(e);
}
public Employee[] listAll() {
Employee[] array = new Employee[al.size()];
System.out.println("SIZE is : "+al.size());
return al.toArray(array);
}
}
public class Main
{
public static void main(String[] args) {
System.out.println(" ");
Employee e1 = new Employee(111,"Employee-1","loc-1",100);
EmployeeDB d1 = new EmployeeDB();
d1.addEmployee(e1);
Employee e2 = new Employee(222,"Employee-2","loc-2",200);
EmployeeDB d2 = new EmployeeDB();
d2.addEmployee(e2);
EmployeeDB x = new EmployeeDB();
Employee[] arr = x.listAll();
for(Employee e : arr){
System.out.println( e.eid );
System.out.println( e.eName );
System.out.println( e.eAddr );
System.out.println("**************");
}
}
}
这里我向ArrayList添加了两个对象。最后,我试图在主类函数中显示这两个元素。
但是元素没有被添加。在添加两个对象后,它告诉我ArrayList的大小为0,并且没有显示任何元素。
请帮助我了解如何获得所需结果。