創建可變數量的對象並顯示java中的所有對象

Question

我在這裏有一個工資計劃，我希望能夠將對象添加到Employee類。目前我定義了與Employee類相關的對象emp。如果我想在我的腳本中輸入STOP命令之前能夠動態創建對象，該怎麼辦？另外，一旦完成，我怎麼能打印所有與Employee類相關的對象。提前致謝。

import java.util.Scanner; 

class PayrollProgram 
{ 


public static void main(String[] args) 
{ 
    Scanner scan = new Scanner(System.in); 

    List<Employee> employees = new ArrayList<>(); 

    while (!emp.name.equals("STOP")) 
    { 
    Employee emp = new Employee(); 

    System.out.print("Employee's Name: "); 
    emp.name = scan.next(); 

    if(emp.name.equals("STOP")) 
     { 
      System.out.printf("The Application is STOPPING......"); 
     break; 
     } 

    System.out.print("Enter hourly wage: $ "); 
    emp.wage = scan.nextDouble(); 
    while (emp.wage < 0) 
    { 
     System.out.printf("Please Enter a Positive Number! \n"); 
     System.out.print("Enter hourly wage: $ "); 
     emp.wage = scan.nextDouble(); 
    } 

    System.out.print("Hours Worked in Week: "); 
    emp.hours = scan.nextDouble(); 
    while (emp.hours < 0) 
    { 
     System.out.printf("Please Enter a Positive Number! \n"); 
     System.out.print("Hours Worked in Week: "); 
     emp.hours = scan.nextDouble(); 
    } 

    employees.add(emp); 
    emp.printEmployee(); 

    } 
    for(Employee emp : employees) 
     { 
     System.outprintln(emp.name); 
     } 
} 

} 

Answer 1

保留一個數據結構（通常是本例中的一個列表），該數據結構持有每個員工。每個循環你只需創建一個新員工並將其添加到列表中。之後你可以打印一切。

List<Employee> employees = new ArrayList<>(); 

while (!emp.name.equals("STOP")) { 
Employee emp = new Employee(); 
// read all the data from input 

employees.add(emp); 
} 

for(Employee emp : employees) { 
System.out.println(emp.name); 
}