collections.sort compiler error?

[maggie joseph]

package Renewal;
import java.util.Collections;
import java.util.Collections;
import java.util.Iterator;
import java.util.LinkedHashSet;
import java.util.List;

class Turtle implements Comparable<Turtle>{
	int size;
	Turtle y;
	Integer x;
	public Turtle(int s){
		x=s;
	}
	public boolean equals(Object o){
		return (this.size==((Turtle)o).size);
	}
	public int hashcode(){
		return size/5;
	}
	@Override
	public int compareTo(Turtle t) {
		return x.compareTo(t.x);
	
	}
}
public class TurtleTest {
	public static void main(String[] args){
LinkedHashSet<Turtle> lh=new LinkedHashSet<Turtle>();	
lh.add(new Turtle(1));
lh.add(new Turtle(34));
lh.add(new Turtle(20));
lh.add(new Turtle(34));

System.out.println(lh.size());
for (Turtle t:lh)
	System.out.println(t.x);
Collections.sort(lh);----------------compiler error here?????? :argh:
for (Turtle t:lh)
	System.out.println(t.x);

	}

}

[Sagar Rohankar]

First, I searched for the problem, I didn't find. Then I looked at code and somewhere in the code, you comment your question, which is at all not attentive in any manner.
Second, if you posted the error that will yield more answer and error are sometime self explainable.

[Christophe Verré]

What type of objects does Collections.sort accepts ? Check the API.

[Anuradha Prasanna]

hi,

java.util.Collections contains the following methods for sorting,

1)static void sort(List)
2)static void sort(List, Comparator)

from the above, we can see, the sort() method takes only argument of type List to sort. It does not sort HashSets.

[Sagar Rohankar]

and if you really want your set to be sorted one, try using java.util.TreeSet ;)