CODEWITHSUNDEEP
javaandroidhashmap
Aziz S. Kural
Aziz S. Kural

Reputation: 193

How to add keys and values to a Hashmap while getting 'cannot resolve put symbol' error

I am working with Android Studio 1.4.1. I had just created a Hashmap and was following a tutorial (in Java) on how to populate and manipulate it.

However, I get a 'cannot resolve symbol put' error and the "put" command is in red.

The image I added shows the auto complete snapshot and although java.util.HashMap is imported, there isn't any "put" command that is available in autocomplete. The available commands also are showing in red. I tried to use them instead of the "put" command. I keep having this type of problem all along. How can I fix it?

Image

import java.util.HashMap;

HashMap<String, String> pozisyon = new HashMap<String, String>();
pozisyon.put("SKale", "a8");

Upvotes: 7

Views: 23471

Answers (3)

Toukea Tatsi
Toukea Tatsi

Reputation: 199

Assuming that you are wishing to put a value to a HashMap at the same time you initialize it. I will suggest you this "magic" Java syntax:

Try this:

 public class ClassName {
    HashMap<String, String> hashMap = new HashMap<String, String>(){
        {
            put("one", "two");
            put("two", "three");
        }
    };
    /*
        Other code and constructor can go here.
        ....
        ....
     */
}

Indeed, from Java anywhere even on a non-function code section, you can immediately call the object instance function and properties by following the pattern shown above;-)

Upvotes: 2

Arman Hakim Sagar
Arman Hakim Sagar

Reputation: 716

Try this:

public class Class {
    HashMap arrayList1 = new HashMap<>();;
    arrayList1.put("32", "Bangalore");
    arrayList1.put("32", "India");
}

Upvotes: -1

Lubo Kanev
Lubo Kanev

Reputation: 480

You cannot add elements in HashMap fields outside of methods. Things like this won’t work:

public class Class {
    HashMap<String, String> hashMap = new HashMap<String, String>();
    hashMap.put("one", "two");
}

If you want to achieve that, put it in the constructors, like so:

public class Class {
    HashMap<String, String> hashMap = new HashMap<String, String>();

    public Class() {
        hashMap.put("one", "two");
    }
}

Another way you can do it is in a static block.

Upvotes: 23

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