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Editorial Team
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Asked: 2026-06-16T00:06:29+00:00

if I want id is key and name, phoneNumber, eamil are values. public class

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if I want “id” is key and “name”, “phoneNumber”, “eamil” are values.

public class Personal {

    private int id;
    private String name;
    private int phoneNumber;
    private String email;

    public Personal(int id){
        this.id = id;
    }

    //getter and setter here
}

after input many person data. I can get data by id.

output ex: map.get(100001); // [Dan, 123456, Dan@gmail.com]
           map.get(100002); // [Kim, 123343, Kim@gmail.com] 
           ...

Question: What’s the best ways to implement this HashMap ?

Thanks a lot!

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1 Answer

  1. Editorial Team

    If the IDs are unique and set in stone, you could use:

    Map<Integer,Personal> map = new HashMap<Integer,Personal>();

    To add an object p:

    map.put(p.getId(), p);

    Then

    map.get(100001);

    would return the corresponding object.

    If the IDs can repeat or can change, things get more complicated. If that’s the case, please explain your exact requirements so that we can help further.

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