String class print sentence?

[Bangarang]

Hello I'm a Java beginner and for an assignment I have to "Write two programs: one using the String class and one using the StringBuffer class. Your programs should store a set of Strings in an ArrayList and print those Strings in the order by which they are added." I am currently stuck on the first part! I have tried absolutely everything but, I just don't understand what I'm doing wrong???
Here is my code:

import java.util.ArrayList;
public class String
{
    public static void main(String[] args)
    {
        String n1 = "I";
        String n2 = "enjoy";
        String n3 = "eating";
        String n4 = "fried";
        String n5 = "chicken";
        String n6 = "on";
        String n7 = "Fridays!";
        ArrayList sentence = new ArrayList ();
        sentence.add (0, n1);
        sentence.add (1, n2);
        sentence.add (2, n3);
        sentence.add (3, n4);
        sentence.add (4, n5);
        sentence.add (5, n6);
        sentence.add (6, n7);
        System.out.print(sentence.get (0));
        System.out.print(sentence.get (1));
        System.out.print(sentence.get (2));
        System.out.print(sentence.get (3));
        System.out.print(sentence.get (4));
        System.out.print(sentence.get (5));
        System.out.print(sentence.get (6));
    }
}

And here is the error that is coming up!

C:\Users\Dustin\Desktop>javac String.java
String.java:6: error: incompatible types
        String n1 = "I";
                    ^
  required: String
  found:    java.lang.String
String.java:7: error: incompatible types
        String n2 = "enjoy";
                    ^
  required: String
  found:    java.lang.String
String.java:8: error: incompatible types
        String n3 = "eating";
                    ^
  required: String
  found:    java.lang.String
String.java:9: error: incompatible types
        String n4 = "fried";
                    ^
  required: String
  found:    java.lang.String
String.java:10: error: incompatible types
        String n5 = "chicken";
                    ^
  required: String
  found:    java.lang.String
String.java:11: error: incompatible types
        String n6 = "on";
                    ^
  required: String
  found:    java.lang.String
String.java:12: error: incompatible types
        String n7 = "Fridays!";
                    ^
  required: String
  found:    java.lang.String
Note: String.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
7 errors

Any shove in the right direction would be much appreciated!

[jim829]

Change your class name. String is a major class in the JDK API. So your class is the one being used, not the java class String.

Regards,
Jim

[Bangarang]

Oh gosh, what a silly mistake! Thank you. I feel like an idiot... ahaha;;

[Bangarang]

It's still not working correctly. It says it uses unchecked or unsafe operations and to recompile with -Xlint:unchecked, so I did... here is the command prompt screen.

Microsoft Windows [Version 6.2.9200]
(c) 2012 Microsoft Corporation. All rights reserved.

C:\Users\Dustin>cd desktop

C:\Users\Dustin\Desktop>javac StringAssignment.java
Note: StringAssignment.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.

C:\Users\Dustin\Desktop>javac -Xlint:unchecked StringAssignment.java
StringAssignment.java:14: warning: [unchecked] unchecked call to add(int,E) as a
 member of the raw type ArrayList
        sentence.add (0, n1);
                     ^
  where E is a type-variable:
    E extends Object declared in class ArrayList
StringAssignment.java:15: warning: [unchecked] unchecked call to add(int,E) as a
 member of the raw type ArrayList
        sentence.add (1, n2);
                     ^
  where E is a type-variable:
    E extends Object declared in class ArrayList
StringAssignment.java:16: warning: [unchecked] unchecked call to add(int,E) as a
 member of the raw type ArrayList
        sentence.add (2, n3);
                     ^
  where E is a type-variable:
    E extends Object declared in class ArrayList
StringAssignment.java:17: warning: [unchecked] unchecked call to add(int,E) as a
 member of the raw type ArrayList
        sentence.add (3, n4);
                     ^
  where E is a type-variable:
    E extends Object declared in class ArrayList
StringAssignment.java:18: warning: [unchecked] unchecked call to add(int,E) as a
 member of the raw type ArrayList
        sentence.add (4, n5);
                     ^
  where E is a type-variable:
    E extends Object declared in class ArrayList
StringAssignment.java:19: warning: [unchecked] unchecked call to add(int,E) as a
 member of the raw type ArrayList
        sentence.add (5, n6);
                     ^
  where E is a type-variable:
    E extends Object declared in class ArrayList
StringAssignment.java:20: warning: [unchecked] unchecked call to add(int,E) as a
 member of the raw type ArrayList
        sentence.add (6, n7);
                     ^
  where E is a type-variable:
    E extends Object declared in class ArrayList
7 warnings

C:\Users\Dustin\Desktop>

I'm not really sure what to make of all this... We never went over anything like this in class, and my teacher takes forever to respond to e-mails.

[jim829]

ArrayList is a generic type so declare it like this.

List<Integer> sentence = new ArrayList<Integer>();
//or if you need other methods of ArrayList and not just the interface
ArrayList<Integer>sentence = new ArrayList<Integer>();

Regards,
Jim

[Bangarang]

It is working great now! Thank you.