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Core Java - Interview Questions and Answers for 'Compareto' - 5 question(s) found - Order By Newest

 Q1. Can we override compareTo method for Enumerations ?Core Java
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Ans. No. compareTo method is declared final for the Enumerations and hence cannot be overriden. This has been intentionally done so that one cannot temper with the sorting order on the Enumeration which is the order in which Enum constants are declared.

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   Like         Discuss         Correct / Improve     java   compareto   final methods   enum   enumeration      expert


 Q2. How TreeMap orders the elements if the Key is a String ?
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Ans. As String implements Comparable, It refers to the String compareTo method to identify the order relationship among those elements.

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   Like         Discuss         Correct / Improve     java   collections   comparable interface   treemap   compareto


 Q3. 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
Admin
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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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   Like         Discuss         Correct / Improve     java   set   treeset   string   compareto   coding   code


 Q4. 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.
Anonymous
Ans. Order in which constants are declared.

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   Like         Discuss         Correct / Improve     enum   collections   sorted collections   treemap   treeset   compareto   comparable   java


 Q5. Difference between equals and compareTo in Java ?Core Java2019-02-05 16:38:11

Ans. "equals" is the method of object class which is supposed to be overridden to check object equality. x.equals(y) means the references x and y are holding objects that are equal.

The compareTo() method is used for comparing two objects in Java. It is usually defined for the classes whose objects needs to be ordered through Comparable interface or need to be part of an ordered collection like TreeSet or TreeMap.

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   Like         Discuss         Correct / Improve     equals  compareTo  equals vs compareTo


 Q6. Which method needs to be implemented if a class is implementing comparable interface ?Core Java
a. comp
b. compare
c. compareTo
d. compareEquals

Ans.c. compareTo

 Q7. We cannot override compareTo method for ...Core Java
a. Abstract Class
b. Final Class
c. Enum
d. Interfaces

Ans.c. Enum


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