Program: How to check there in no common element between two list objects by using Collections.disjoint() method?

Collections.disjoint() method returns true if the two specified collections have no elements in common. Care must be exercised if this method is used on collections that do not comply with the general contract for Collection. Implementations may elect to iterate over either collection and test for containment in the other collection (or to perform any equivalent computation). If either collection uses a nonstandard equality test (as does a SortedSet whose ordering is not compatible with equals, or the key set of an IdentityHashMap), both collections must use the same nonstandard equality test, or the result of this method is undefined.

package com.java2novice.collections;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

public class MyListDisjoint {

	public static void main(String a[]){
		
		List<String> sl = new ArrayList<String>();
		sl.add("apple");
		sl.add("java");
		sl.add("c++");
		sl.add("unix");
		sl.add("orange");
		sl.add("airtel");
		List<String> tl = new ArrayList<String>();
		tl.add("job");
		tl.add("oracle");
		tl.add("jungle");
		tl.add("cricket");
		boolean isCommon = Collections.disjoint(sl,tl);
		System.out.println("Does not found any common elements? "+isCommon);
		tl.add("java");
		isCommon = Collections.disjoint(sl,tl);
		System.out.println("Does not found any common elements? "+isCommon);
	}
}

Does not found any common elements? true
Does not found any common elements? false