Looking for a hashMap example

Question

Hi, I need to take the details of employees from the user,as an input, in an Employee class and want to insert it as a value to a hashMap, the hashMap key value being the employee number. I am not able to display the hashMap within the code. Can anyone help to solve this problem. Thankyou in advance.

Answer 1

hi thank you for your guidance. Below is my main class.
public class PersonDetails
public static void main(String[]args)
          int noOfUsers;
          String regNumber=null;
          String lastName;
          String firstName;
          int age;
          Map<String, GetDetails> map=new HashMap<String, GetDetails>();
          GetDetails n=null;
     try
          BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
     System.out.println("The number of people details to be entered:");
          noOfUsers = Integer.parseInt(br.readLine());
          for(int i=0;i<noOfUsers;i++)
               System.out.println("Enter the regester number:");
               regNumber = br.readLine();
               System.out.println("Enter the last name:");
               lastName =br.readLine();
               System.out.println("Enter the first name:");
               firstName = br.readLine();
               System.out.println("Enter the age:");
               age = Integer.parseInt(br.readLine());
               n = new GetDetails(regNumber, lastName, firstName, age);
               for(int j=0; j<noOfUsers; j++)
                    map.put(GetDetails.regNumber,n);
     catch(Exception e)
And here is my GetDetails Class.
public class GetDetails
     String regNumber;
     String lastName;
     String firstName;
     int age;
GetDetails(String regNumber, String lastName, String firstName, int age)
     this.regNumber = regNumber;
     this.lastName =lastName;
     this.firstName = firstName;
     this.age = age;
In the main class, am not able to access the details of the employee in map.put(GetDetails.regNumber,n); Sm have not completed the rest of the program as I was confused whether am going in a right way or not. Can you help me to generate this code? To be specific, I need to accept the details of the employee together in one object so that whenever any particular key is requested , its corresponding full details of that person should be displayed.