Hash set and Tree set

packagePBL_Lab;
importjava.util.*;
publicclass exp_4 {
	
	exp_4()
	{
		HashSet hs=newHashSet();
		hs.add("amrit");
		hs.add("pal");
		hs.add("singh");
		hs.add("Sandhu");
		System.out.print("elemenst in set\n"+hs);
		//remove specific element from hashset
		hs.remove("Sandhu");
		System.out.print("\nAfter removing Sandhu from set\n"+hs);
		
		//another set
		HashSet hs1=newHashSet();
		hs1.add("Sandhu");
		hs1.add("CSE");
		hs1.add("Chandigarh");
		hs1.add("University");
		System.out.print("\nset item\n"+hs1);
		//cancatenate two sets
		hs.addAll(hs1);
		System.out.print("\nAftercancatenate two sets"+hs);
		//use of iterator
		System.out.print("\nTraversing item using iterator\n");
		Iterator it=hs.iterator();
		while(it.hasNext())
		{
			System.out.print(it.next()+" ");
		}
		//remove set 2 from set 1
		hs.removeAll(hs1);
		System.out.print("\nafter remove second set\n"+hs);
		//clear complete set
		hs.clear();
		System.out.print("\nafter clear set"+hs);
		
		System.out.print("\n------------------------------------------------------methods of tree set------------------------------------------------------\n");
		
		//use of tree set
		TreeSetts=newTreeSet();
		ts.add("amrit");
		ts.add("pal");
		ts.add("singh");
		ts.add("Sandhu");
		System.out.print("elemenst in set\n"+hs);
		//remove specific element from treeset
		hs.remove("Sandhu");
		System.out.print("\nAfter removing Sandhu from set\n"+ts);
		
		//another set
		TreeSetts1=newTreeSet();
		ts1.add("Sandhu");
		ts1.add("CSE");
		ts1.add("Chandigarh");
		ts1.add("University");
		System.out.print("\nset item\n"+ts1);
		//cancatenate two sets
		ts.addAll(ts1);
		System.out.print("\nAftercancatenate two sets"+ts);
		//use of iterator
		System.out.print("\nTraversing item using iterator\n");
		Iterator it1=ts.iterator();
		while(it1.hasNext())
		{
			System.out.print(it1.next()+" ");
		}
		//remove set 2 from set 1
		ts.removeAll(ts1);
		System.out.print("\nafter remove second set\n"+ts);
		//clear complete set
		ts.clear();
		System.out.print("\nafter clear set"+ts);
		
		
	}
	publicstaticvoidmain(String agrs[]) {
		
		new exp_4();
	}
	
}