Java对象数组相互覆盖

Question

我有三个类 Main、Process 和 Employee。我的问题是，最后一个对象数组总是覆盖第一个。我认为逻辑上没有问题，我只是简单地使用getters和setters。

    public class Main {

        public static void main(String args[]){
            Process p = new Process();

            p.setEmployeeList(p.generate());

            p.setExternalEmployeeList(p.generate());

            for(int i=0; i<5; i++){
                System.out.println(p.getEmployeeList()[i].getID());
            }

            System.out.println();

            for(int i=0; i<5; i++){
                System.out.println(p.getExternalEmployeeList()[i].getID());
            }

        }

    }

--

import java.util.Random;

public class Process {

    private int rndTemp;
    private int numberOfDice = 5;
    private Random random = new Random();
    public Employee[] employeeList = new Employee[5];
    public Employee[] externalEmployeeList = new Employee[5];
    private Employee[] tempList = new Employee[5];

    public Employee[] generate(){
        for(int i=0; i<numberOfDice; i++){
            rndTemp = random.nextInt((6 - 1) + 1) + 1;
            Employee emp = new Employee(rndTemp);

            tempList[i] = emp;
        }
        return tempList;

    }

    public Employee[] getEmployeeList(){
        return employeeList;

    }

    public Employee[] getExternalEmployeeList(){
        return externalEmployeeList;

    }

    public void setExternalEmployeeList(Employee[] externalEmployeeList){
        this.externalEmployeeList = externalEmployeeList;
    }

    public void setEmployeeList(Employee[] employeeList){
        this.employeeList = employeeList;
    }

}

--

public class Employee {

    public int empID;

    public Employee(int empID) {
        this.empID = empID;
    }


    public void setID(int empID) {
        this.empID = empID;
    }

    public int getID() {
        return empID;
    }
}

Answer 1

你必须把

Employee[] tempList = new Employee[5];

在您的生成方法中，它将按预期工作。

否则，您将只传递对数组的引用，而下一次您将覆盖同一个数组。

此外，其他两个数组不需要初始化，因为它们将被分配给新创建的数组。