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Java Coding Interview programming Questions : Java Test on HashMap

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instanceof java

Posts: 576
Nickname: instanceof
Registered: Jan, 2015

instanceof java is a java related one.
Java Coding Interview programming Questions : Java Test on HashMap Posted: Feb 15, 2016 7:39 AM
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This post originated from an RSS feed registered with Java Buzz by instanceof java.
Original Post: Java Coding Interview programming Questions : Java Test on HashMap
Feed Title: Instance Of Java
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Feed Description: Instance of Java. A place where you can learn java in simple way each and every topic covered with many points and sample programs. 		Latest Java Buzz Posts
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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>();  

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


Click for Output



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>();  

  7.      hm.put(1, "one");
  8.      hm.put(2, "two");
  9.      hm.put(3, "three");
  10.  
  11.      hm.put(1, "ONE");
  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. }


Click for Output




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>();  

  7.      hm.put(1, "one");
  8.      hm.put(2, "two");
  9.      hm.put(3, "three");
  10.  
  11.      hm.put(1, "ONE");
  12.      hm.put(null,null);
  13.  
  14.     System.out.println(hm.size()); 
  15.  
  16. for (Integer name: hm.keySet()){
  17.  
  18.    System.out.println(name + " " + hm.get(name)); 
  19.   
  20. }
  21.  
  22. }
  23. }


Click for Output




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>();  

  7.      hm.put(1, "one");
  8.      hm.put(2, "two");
  9.      hm.put(3, "three");
  10.  
  11.      hm.put(1, "ONE");
  12.      hm.put(null,null);
  13.  
  14.      Integer i=null;
  15.      String str="java programming basics Interview questions";
  16.  
  17.      hm.put(i, str);
  18.  
  19.     System.out.println(hm.size()); 
  20.  
  21. for (Integer name: hm.keySet()){
  22.  
  23.    System.out.println(name + " " + hm.get(name)); 
  24.   
  25. }
  26.  
  27. }
  28. }


Click for Output



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