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POtrying to implement concept of LinkedList through java , but it is giving giving error at compile time?
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copied!<p>I am trying simple linked list Collection program, but it is not giving me out put.<br> i created this stuff </p> <pre><code>import java.lang.*; import java.util.*; class Linkedlist { public static void main (String [] args) { LinkedList ll=new LinkedList (); System.out.println ("CONTENTS OF l1 = "+ll); System.out.println ("SIZE = "+ll.size ()); ll.add (new Integer (10)); ll.add (new Integer (20)); ll.add (new Integer (30)); ll.add (new Integer (40)); System.out.println ("CONTENTS OF ll = "+ll); System.out.println ("SIZE = "+ll.size ()); // retrieving data of ll using toArray () Object obj []=ll.toArray (); int s=0; for (int i=0; i<obj.length; i++) { Integer io= (Integer) obj [i]; int x=io.intValue (); s=s+x; } System.out.println ("SUM USING toArray () = "+s); ll.addFirst (new Integer (5)); ll.addFirst (new Integer (6)); System.out.println ("CONTENTS OF ll = "+ll); System.out.println ("SIZE = "+ll.size ()); // retrieving data of ll using iterator () Iterator itr=ll.iterator (); int s1=0; while (itr.hasNext ()) { Object obj1=itr.next (); Integer io1= (Integer) obj1; int x1=io1.intValue (); s1=s1+x1; } System.out.println ("SUM USING iterator () = "+s1); ListIterator litr=ll.listIterator (); while (litr.hasNext ()) { Object obj2=litr.next (); System.out.print (obj2+","); } System.out.println ("\n"); while (litr.hasPrevious ()) { Object obj3=litr.next (); System.out.print (obj3+","); } System.out.println ("\n"); Object obj4=ll.get (2);// random retrieval System.out.println (obj4); } } </code></pre> <p>output is </p> <pre><code>Note: Linkedlist.java uses unchecked or unsafe operations. Note: Recompile with -Xlint:unchecked for details. </code></pre>

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