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 Q31. TreeMap orders the elements on which field ?
Ans. Keys

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 Q32. How TreeMap orders the elements if the Key is a String ?
Ans. As String implements Comparable, It refers to the String compareTo method to identify the order relationship among those elements.

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 Q33. Can we add heterogeneous elements into TreeMap ?
Ans. No, Sorted collections don't allow addition of heterogeneous elements as they are not comparable.

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 Q34. Will it create any problem if We add elements with key as user defined object into the TreeMap ?
Ans. It won't create any problem if the objects are comparable i.e we have that class implementing Comparable interface.

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  Q35. Can we have null keys in TreeMap ?Core Java
Ans. No, results in exception.

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 Q36. Can value be null in TreeMap ?Core Java
Ans. Yes.

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 Q37. Which interface TreeMap implements ?
Ans. TreeMap implements NavigableMap, SortedMap, Serializable and Clonable.

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  Q38. What is lazy fetching in Hibernate ?Hibernate
Ans. Lazy fetching is the technique of not loading the child objects when parent objects are loaded. By default Hibernate does not load child objects. One can specify whether to load them or not while doing the association.

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 Q39. What will be the output of this code ?

Set mySet = new TreeSet();
mySet.add("4567");
mySet.add("5678");
mySet.add("6789");
for(String s: mySet){
System.out.println(s);
}
Ans. 4567
5678
6789

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 Q40. public class BuggyBread1{

public static void main (String args[]) {
Set<String> mySet = new TreeSet<String>();
mySet.add(""1"");
mySet.add(""2"");
mySet.add(""111"");
for(String d: mySet){
System.out.println(d);
}
}
}		Core Java
Ans. 1
111
2

TreeSet maintains the elements in the ascending order which is identified by the compareTo method. compareTo method in String has been defined such that it results in the natural alphabetic Order. Here the elements in the TreeSet are of String and not of Integer. In String Natural Order, 111 comes before 2 as ascii of 1st character first determines the order.

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   Like         Discuss         Correct / Improve     java   code   coding   set   treeset   string   integer

 Q41. public class BuggyBread1{

public static void main (String args[]) {
Set<Integer> mySet = new TreeSet<Integer>();
mySet.add(1);
mySet.add(2);
mySet.add(111);
for(Integer d: mySet){
System.out.println(d);
}
}
}		Core Java
Ans. 1
2
111

TreeSet maintains the elements in the ascending order which is identified by the compareTo method. compareTo method in Integer has been defined such that it results in the natural numerical Order.

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   Like         Discuss         Correct / Improve     java   code   coding   set   treeset

 Q42. How can we see Dependencies for the project and where exactly they are defined ?Maven
Ans. Using

mvn dependency:tree

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 Q43. How many elements will be there in TreeSet after the last line and Why ?

TreeSet set = new TreeSet();
set .add(new String("abc"));
set .add(new String("abc"));		Core Java
Ans. One.

As we haven't specified the type of TreeSet, it being evaluated with the first element insertion. Once it's identified that it's of type String and as no comparator has been defined, the comparison is done using the String compareTo method. String compareTo method compares the elements by the content / value.

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 Q44. Which takes more memory - float or Float ?Core Java
Ans. float is a native data type whereas Float is a class. A Float object will always take more memory than float variable as there are metadata overheads with the objects.

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 Q45. Which tree is used to implement TreeMap in Java?
Ans. Red Black Tree

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 Q46. If we add Enum constants to a sorted collection ( Treemap , TreeSet ), What will be the order in which they will be maintained ?

a. Sorted Collection wont maintain them in any order.
b. Insertion Order
c. Order in which constants are declared.
d. Natural Sorting Order.
Ans. Order in which constants are declared.

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 Q47. Write code to sort elements of a set
Ans. http://javasearch.buggybread.com/CodeSnippets/searchCodeSamples.php?&category=code&searchOption&keyword=952

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  Q48. Difference between Array and ArrayList ?Core Java
Ans. <a href="http://javahungry.blogspot.com/2015/03/difference-between-array-and-arraylist-in-java-example.html" rel="nofollow">http://javahungry.blogspot.com/2015/03/difference-between-array-and-arraylist-in-java-example.html</a>

  Sample Code for ArrayList

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 Q49. What is the problem with this code

double x=10.04;
int a = x;
Ans. It will give an error saying 'cannot convert from double to int'

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 Q50. What are the different ways to handle an exception ?Core Java
Ans. 1. Wrap the desired code in try block followed by a catch / finally to catch the exception

2. Declare the throws clause with exceptions that the code is expected to throw as an indication to the calling method to take care of it.

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  Q51. What are the core OOPs concepts ?Core Java
Ans. Abstraction, Encapsulation, Polymorphism , Composition and Inheritance

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 Q52. Write code to check if a Binary tree is symmetricalAlgorithm
 This question was recently asked at 'Amazon'.This question is still unanswered. Can you please provide an answer.


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 Q53. Difference between Tree and Graph ?Data Structures
Ans. Graph contain cycles whereas Trees cannot.

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 Q54. In a Tree, find common ancestor of two nodes.Data Structures
 This question was recently asked at 'Amazon'.This question is still unanswered. Can you please provide an answer.


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 Q55. What is difference between clustered and non clustered index?Database
Ans. The clustered index determines how the data is stored in the rows of a table.The non-clustered index stores the data at a single place and the indexes are stored at another place.

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 Q56. Describe SQL JoinsDatabase
Ans. Oracle having following types of joins these are also called 8i joins. There are:

1. Equi (or) Inner join
2. Non Equi join
3.Self join
4.Outer join

Oracle also support the 9i (or) ANSI standard joins.There are:

1.Inner join
2.Left outer join
3.Right outer join
4.Full outer join
5.Natural join

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 Q57. Write a method that returns maximum depth of a tree ?Algorithm
 This question was recently asked at 'One Click Retail'.This question is still unanswered. Can you please provide an answer.


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 Q58. What is the difference between TreeSet and TreeMap ?Core Java
Ans. TreeSet contains only values as elements whereas TreeMap contains Key value pairs.

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 Q59. How to sort objects based on one of the field ?Core Java
Ans. Using comparable and comparator and sorted collections like TreeSet or TreeMap.

or

use stream api from java 8 onwards which internally refers to comparable and comparator through lambda expressions

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 Q60. What are the disadvantages of binary search trees? Algorithm
 This question was recently asked at 'ServiceNow'.This question is still unanswered. Can you please provide an answer.


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