Error using ArrayList in Java

Question

I was solving a problem before including it in my code and using List to get strings then work around with them. I got the error: "type List does not take parameters List words = new ArrayList();" after compilation. I searched but the syntax i use is correct, please whats wrong with the code?

import java.util.Scanner;
import java.util.ArrayList;

public class List{
    public static void main(String args[]){
        List<String> words = new ArrayList<String>();
        Scanner input = new Scanner(System.in);
        for (int i=0; i < 3; i++)
            words.add(input.nextLine());
        System.out.println(words);
    }

}

Never ever use pre-defined class names as your own class name. — Rohit Jain
– Rohit Jain, Commented Jan 21, 2013 at 18:10

Perception · Accepted Answer · 2013-01-21 18:09:03Z

11

This is one of the reasons you should use unique names for your own classes. You are really meaning to use java.util.List, but since you called your class List as well, the real problem is masked. Rename your class and add the import for java.util.List to fix the issue:

import java.util.Scanner;
import java.util.List;
import java.util.ArrayList;

public class MyClass{
    public static void main(String args[]){
        List<String> words = new ArrayList<String>();
        Scanner input = new Scanner(System.in);
        for (int i=0; i < 3; i++)
            words.add(input.nextLine());
        System.out.println(words);
    }
}

answered Jan 21, 2013 at 18:09

Perception

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3 Comments

jn1kk Over a year ago

OP, make sure to close input too. (NEVERMIND)

Rohit Jain Over a year ago

@jsn.. that is really not needed.

jn1kk Over a year ago

@RohitJain, never mind, you are right. You shouldn't close System.in.

Pablo · Accepted Answer · 2013-01-21 18:11:07Z

0

Try this:

import java.util.Scanner;
import java.util.ArrayList;

public class List{
    public static void main(String args[]){
        java.util.List<String> words = new ArrayList<String>();
        Scanner input = new Scanner(System.in);
        for (int i=0; i < 3; i++)
            words.add(input.nextLine());
        System.out.println(words);
    }

}

Your class is called List. So by default, it is assumed that the List you declared refers to your class.

It would be better to avoid names like List for your classes.

answered Jan 21, 2013 at 18:11

Pablo

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