如何避免在对象数组列表中添加重复项 [英] How to avoid adding duplicate entries in an arraylist of objects

问题描述

我有一个'Employee'类，该类具有属性(名称，DoB，员工身份，姓名，薪水).

I have a class 'Employee' which has attributes (Designation, DoB, Employee-I'd, Name, Salary).

现在通过以下功能，我在ArrayList'abc'中添加'n'个雇员对象

Now through the following function I'm adding 'n' employee objects in the ArrayList 'abc'

但是我需要以这样的方式进行修改:如果最终用户尝试添加重复的员工(如果两个员工的姓名相同，则应将其视为重复)，则不允许该用户这样做. ..

But I need to modify it in such a way that if an end user tries to add a duplicate employee (If name of two employees are same then it should be considered as duplicate) then the user is not allowed to do so...

我该怎么做...我想可能是在使用Map Interface ...但是不知道如何实现

How can I do this... I think probably using Map Interface... But no idea, how to implement

public void addEmployees(int n, ArrayList<Employee> abc)    /* 'n' is the number of employees to be added */
{
    Scanner sc=new Scanner(System.in);
    Employee[] obj = new Employee[n];
    for(int i=0;i<n;i++)
    {
            System.out.println("Enter Employee name:");
            String nm=sc.next();
            System.out.println("Enter designation:");
            String des = sc.next();
            System.out.println("Enter employeeI-D:");
            int eId = sc.nextInt();
            System.out.println("Enter salary:");
            double sl = sc.nextDouble();
            System.out.println("Enter date-of-birth:");
            String dt=sc.next();
            obj[i]=new Employee(des,dt,eId,nm,sl);
            abc.add(obj[i]);
    }
}

推荐答案

为了能够检查是否重复，我们可以将名称存储在一个set( Set< String>名称)中，然后检查每次在将员工添加到列表中之前将其添加:

To be able to check for duplication, we can store the names in a set(Set< String > names), and check it every time before adding an employee to the list:

Employee[] obj = new Employee[n];
Set<String> names = new HashSet<String>();
...........
...........
if (!names.contains(nm) {
    abc.add(obj[i]);
    names.add(nm);
}

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