import java.util.*;
public class Hello {
	  static void PrintVektor()
	  {
		  Vector v = new Vector();
		  v.add("text1");
		  v.add(new Integer(2));
		  v.add(null);
		  v.add(1, "text2");
		  System.out.println("[1]: " + v.elementAt(1));
		  System.out.println("Vector:");
		  Iterator it = v.iterator();
		  while (it.hasNext()) {
		    System.out.println(it.next());
		  }
		  System.out.println("Size:"+v.size());
		  System.out.println("--------");
		  v.clear();
	  }
	  static void PrintHashMap()
	  {
		  Map hm = new HashMap();
		  hm.put("txt",  "text file");
		  hm.put("html", "HyperText Markup Language");
		  hm.put("ps",  "post script");
		  hm.put("pdf",  "Portable Document Format");

		  System.out.println("*.html - " + hm.get("html"));  // HyperText Markup Language
		  System.out.println("*.dll - " + hm.get("dll"));  // null
	  }
	  public static void main(String args[])
	  {
		  PrintVektor();
		  PrintHashMap();
	  }
}

Output:

[1]: text2
Vector:
text1
text2
2
null
Size:4
---------
*.html - HyperText Markup Language
*.dll - null

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.*;
public class Hello {
	  static void print(String s)
	  {
	     System.out.println(s);
	  }
	  public static void main(String args[])
	  {
		  String pozdrav;
		  String vstup;
		  BufferedReader in;
		  in = new BufferedReader(new  InputStreamReader(System.in));
		  try{
		      vstup = in.readLine(); }
		  catch(IOException e) {vstup="";}
		  pozdrav="Servus "+vstup+", dnes je " + (new Date().getDate())+"."+ (new Date().getMonth())+".";

		  print(pozdrav);
	  }
}