CODEWITHSUNDEEP
java
Big.Child
Big.Child

Reputation: 3098

Type mismatch: cannot convert from ArrayList to List

I have only this, but my compiler says:Type mismatch: cannot convert from ArrayList to List So what is the problem can anyone tell me ? I'm using Elipse Java EE IDE.

import java.awt.List;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;


public class Main {
    public static void main(String[] args) {
        List list = new ArrayList();


    }
}

Upvotes: 13

Views: 43334

Answers (5)

Ted Hopp
Ted Hopp

Reputation: 234795

You need to import java.util.List instead of java.awt.List.

You might also want to use type parameters instead of raw types. For instance, if the list was going to hold String values:

List<String> list = new ArrayList<>();

or, prior to Java 7:

List<String> list = new ArrayList<String>();

Upvotes: 4

raddykrish
raddykrish

Reputation: 1866

As told by others its an import error. Since you are using Eclipse EDE if there is an error keep the cursor in that place and press Ctrl + 1, it will show suggestions for you which might help you in fixing the errors.

Upvotes: 1

templatetypedef
templatetypedef

Reputation: 372764

You've imported java.awt.List, which is the list control in the AWT package, instead of java.util.List, which is the collections class representing a list of elements. Thus Java thinks you're converting from a logical array list of values into a widget, which doesn't make any sense.

Changing the import line to 

import java.util.List;

should fix this, as would writing

java.util.List list = new ArrayList();

to explicitly indicate that you want a collection.

That said, you should also be using generics here. Using raw collections types has long been deprecated. The best answer is to write something like

List<T> list = new ArrayList<T>();

Hope this helps!

Upvotes: 5

Betlista
Betlista

Reputation: 10549

incorrect import, it has to be java.util.List.

Upvotes: 30

Tomasz Nurkiewicz
Tomasz Nurkiewicz

Reputation: 340723

Because java.util.ArrayList extends java.util.List, not java.awt.List. You are importing the wrong class:

import java.awt.List;

vs.

import java.util.List;

Upvotes: 2

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