» » Java Coding Interview programming Questions : Java Test on HashMap

1.What will be the Output of this program.


  1. public class HashMapJavaTricky{
  2.  
  3. public static void main(String[] args) {
  4.  
  5.     HashMap<Integer,String> hm= new HashMap<Integer, String>();  

  6.      hm.put(1, "one");
  7.      hm.put(2, "two");
  8.      hm.put(3, "three");
  9.  
  10.     System.out.println(hm.size()); 
  11.  
  12. for (Integer name: hm.keySet()){
  13.  
  14.    System.out.println(name + " " + hm.get(name)); 
  15.   
  16. }
  17.  
  18. }
  19. }





2.Basics of java programming : Hashmap

  1. public class HashMapJavaTricky{
  2.  
  3. public static void main(String[] args) {
  4.  
  5.     HashMap<Integer,String> hm= new HashMap<Integer, String>();  

  6.      hm.put(1, "one");
  7.      hm.put(2, "two");
  8.      hm.put(3, "three");
  9.  
  10.      hm.put(1, "ONE");
  11.  
  12.     System.out.println(hm.size()); 
  13.  
  14. for (Integer name: hm.keySet()){
  15.  
  16.    System.out.println(name + " " + hm.get(name)); 
  17.   
  18. }
  19.  
  20. }
  21. }









3.Java programming examples: Hashmap

  1. public class HashMapJavaTricky{
  2.  
  3. public static void main(String[] args) {
  4.  
  5.     HashMap<Integer,String> hm= new HashMap<Integer, String>();  

  6.      hm.put(1, "one");
  7.      hm.put(2, "two");
  8.      hm.put(3, "three");
  9.  
  10.      hm.put(1, "ONE");
  11.      hm.put(null,null);
  12.  
  13.     System.out.println(hm.size()); 
  14.  
  15. for (Integer name: hm.keySet()){
  16.  
  17.    System.out.println(name + " " + hm.get(name)); 
  18.   
  19. }
  20.  
  21. }
  22. }






4.Java programming for beginners : HashMap

  1. public class HashMapJavaTricky{
  2.  
  3. public static void main(String[] args) {
  4.  
  5.     HashMap<Integer,String> hm= new HashMap<Integer, String>();  

  6.      hm.put(1, "one");
  7.      hm.put(2, "two");
  8.      hm.put(3, "three");
  9.  
  10.      hm.put(1, "ONE");
  11.      hm.put(null,null);
  12.  
  13.      Integer i=null;
  14.      String str="java programming basics Interview questions";
  15.  
  16.      hm.put(i, str);
  17.  
  18.     System.out.println(hm.size()); 
  19.  
  20. for (Integer name: hm.keySet()){
  21.  
  22.    System.out.println(name + " " + hm.get(name)); 
  23.   
  24. }
  25.  
  26. }
  27. }





Instance Of Java

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