CODEWITHSUNDEEP
javaarraysarraylist
Zak
Zak

Reputation: 43

ArrayList class .add error

I am currently learning about arrays and the weblesson from my class is teaching me about the ArrayList class. I tried to make my own array to try it out, but when I followed the format the weblesson showed me, I get a compiler error that reads: "no suitable method found for add(java.lang.String)". While highlighting the ".add".

import java.util.ArrayList;
public class String
{
    ArrayList <String> myArrayList;
    public void arrayTest()
    {
        ArrayList <String> names = new ArrayList <String> ();

        names.add("John");
        names.add("Smith");
        names.add("Matt");

        System.out.println(myArrayList.get(1));
    }
}

Upvotes: 0

Views: 226

Answers (4)

Reimeus
Reimeus

Reputation: 159754

Your class is hiding java.lang.String so there is a type mismatch between the argument used for the add method and your custom String class. Rename it to something else other than String

Upvotes: 3

Jobs
Jobs

Reputation: 3377

Because you are naming your class String, the String in 

ArrayList < String > names

is referring to your self-defined class type. Therefore, only the 'String' objects that you defined can be added to the ArrayList, not the actual Java Strings. To correct this, name your class something else.

Upvotes: 0

Christian Tapia
Christian Tapia

Reputation: 34146

What happens is that you are naming your class as String, which will make the compiler get confused because there already exist a built-in String.

What can you do?

  • Rename your class, to something different:

    public class StringTest

  • Or use the fully qualified class name (which I wouldn't recommend):

    ArrayList <java.lang.String> names = new ArrayList <java.lang.String> ();

Upvotes: 1

Andr&#233; Stannek
Andr&#233; Stannek

Reputation: 7863

The problem might be that your class is also called String. I'm guessing the generic type of your ArrayList is that and not the Java String.

Upvotes: 1

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