Io ho fatto cosi:

public class JArrayList {

JArrayList(){
System.out.println("Ciao a tutti");
ArrayList al = new ArrayList();
al.add("uno");
al.add("due");

}




public static void main(String argv[]){
JArrayList u = new JArrayList();
}


}



E QUESTO E L'ERRORE:

C:\temp\ArrayList>javac JArrayList.java
.\ArrayList.java:13: class JArrayList is public, should be declared in a file named JArrayList.java
public class JArrayList {
^
JArrayList.java:17: cannot resolve symbol
symbol : constructor ArrayList ()
location: class ArrayList
ArrayList al = new ArrayList();
^
JArrayList.java:18: cannot resolve symbol
symbol : method add (java.lang.String)
location: class ArrayList
al.add("uno");
^
JArrayList.java:19: cannot resolve symbol
symbol : method add (java.lang.String)
location: class ArrayList
al.add("due");
^
4 errors



Grazie FAbio