Problem with Arraylist

Question

I’m learning about Array and I’m racking my brain with this code, can someone explain to me why it’s not working?

This error appears

The type List is not Generic; it cannot be parameterized with Arguments

in this line List<Integer> lista = new ArrayList<Integer>();

package DeclaracaoArray;

import java.awt.List;
import java.util.ArrayList;
import java.util.Collections;

public class Declaracao_Array {


    public int sorteia(){
            List<Integer> lista = new ArrayList<Integer>() ;

            lista.add ( "Alice" ) ;
            lista.add ( "Bruno" ) ;
            lista.add ( "Carlos" ) ;
            lista.add ( "Daniel" ) ;

   Collections.shuffle ( lista ) ;

       // pega qualquer indice. pegamos o primeiro para conveniencia.

       return (( Integer ) lista.get ( 0 )).intValue () ;
    }
}

Answer 1

You imported the wrong package:

import java.awt.List;

When it was meant to be:

import java.util.List;

As can be seen in the documentation List that you used does not make use of the generics, while the List that you wanted to use yes.

Answer 2

You are defining that the list will contain variables of the type Integer while you are filling in with variables of the type String who are the names.

If you will not add a value that type is different from String declare the list variable this way:

List lista = new ArrayList();

Or

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