Why doesn't this very simple code snippet work?

// - - - - - - - - - - - - - - - - code
import java.io.*;
import java.util.*;

// __
class ALS00{
 protected int iLL;
 ArrayList<String> ALS = null;
// __
 LSet00(int iLL){
  if(iLL > -1){ this.iLL = iLL; ALS = new ArrayList<String>(); }
  else{}
 }
// __
 public boolean setNewS(String aS){
  boolean IsNw = ALS.contains(aS);
  if(!IsNw){
   int iSz = ALS.size(); ALS.add(aS); IsNw = ((ALS.size() - iSz) == 1);
  }
// __
  return(IsNw);
 }
}
// __
public class ALS00Test{
 public static void main(String[] aArgs){ ALS00 ALS = new ALS00(); }
}
// - - - - - - - - - - - - - - - -
..
 It should based on:
..
 http://java.sun.com/j2se/1.5.0/docs/api/java/util/ArrayList.html
..

// - - - - - - - - - - - - - - - - errors
sh-3.1# javac *.java
ALS00Test.java:7: <identifier> expected
 ArrayList<String> ALS = null;
          ^
ALS00Test.java:9: invalid method declaration; return type required
 LSet00(int iLL){
 ^
ALS00Test.java:12: '(' or '[' expected
   ALS = new ArrayList<String>();
                      ^
SlashDotCleaner04Test.java:7: <identifier> expected
 HashSet<String> HSS;
        ^
SlashDotCleaner04Test.java:13: '(' or '[' expected
   HSS = new HashSet<String>();
                    ^
5 errors
// - - - - - - - - - - - - - - - -