Need help on generics

[Analise Ramil]

Can anyone please explain me why I am getting these errors and how I could fix it?

***************************************************************
AList.java:23: type ArrayList does not take parameters
List<Integer> iL = new ArrayList<Integer>();
^
.\ArrayList.java:22: incompatible types
found : ArrayList
required: java.util.List<java.lang.Integer>
List<Integer> iL = new ArrayList();
^
Note: Some input files use unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
2 errors
***************************************************************

The code below came from S&B book page 559, with little modification.

 
import java.util.*;
 
class AList {
public static void main (String[] args) {
String[] sa = {"one","two","three","four"};
List sList = Arrays.asList(sa);
for(String s:sa)
System.out.print(s+" ");
System.out.println("\n"+sList);
 
System.out.println("List size: " +sList.size());
System.out.println("List idx2: "+sList.get(2));
 
sList.set(3, "six");
sa[1] = "five";

for(String s:sa)
System.out.print(s+ " ");
System.out.println("\n"+sList);
System.out.println("\nsList[1]: "+sList.get(1));
 
List<Integer> iL = new ArrayList<Integer>();
 
for (int x = 0; x<3; x++)
iL.add(x);
 
for (int s:iL)
System.out.println(s+" ");
 
Object[] oa = iL.toArray();

for(Object o :-o	 a)
System.out.print(o+" ");
 
Integer[] ia = new Integer[3];
ia=iL.toArray(ia);
for(int x:ia)
System.out.print(x+" ");
}
}
 

Thanks in advance.

[Rekha Srinath]

Are you using Java 4?

The code compiles fine for me. I am using Java6,Update7.

[Ankit Garg]

Hi Analise! Welcome to javaranch.

As far as your problem goes, is the code you put here exactly what you wrote. I feel that you named your own class as ArrayList.

This can be seen from your error too

AList.java:23: type ArrayList does not take parameters
List<Integer> iL = new ArrayList<Integer>();
^
.\ArrayList.java:22: incompatible types
found : ArrayList
required: java.util.List<java.lang.Integer>
List<Integer> iL = new ArrayList();
^
Note: Some input files use unchecked or unsafe operations.

[Analise Ramil]

Hello!
Thanks for your reply.

Im using java java 5.
Hmmm I still can't have it working.

I named the class originally as ArrayList.java but later renamed it.
I will try to restart my pc and see if I can get this work.

Thanks again.

[Analise Ramil]

Hello again.

I got the code working now. I deleted ArrayList.java from my drive, the original file name. Thanks for pointing it out to me Ankit.

However, I am getting compiler note as follows:

**************************************
c:\JavaWork>javac AList.java
Note: AList.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
**************************************

Are you getting the same note Rekha?

Can anyone explain how and if there is something I can do to get a clean compilation (no note).

[Ankit Garg]

This is not an error. It is a warning...

[Analise Ramil]

Originally posted by Ankit Garg:
This is not an error. It is a warning...

Ok Ankit! Got it, thanks.