Why do we use comparator in Java?
Also know, what is the use of comparator in Java?
Java Comparator interface is used to order the objects of a user-defined class. This interface is found in java. util package and contains 2 methods compare(Object obj1,Object obj2) and equals(Object element).
Beside above, how do you implement a comparator in Java? Using Comparator
- Create a class that implements Comparator (and thus the compare() method that does the work previously done by compareTo()).
- Make an instance of the Comparator class.
- Call the overloaded sort() method, giving it both the list and the instance of the class that implements Comparator.
In this regard, what is the use of comparator and comparable in Java?
Comparable v/s Comparator in Java Comparable interface is used to sort the objects with natural ordering. Comparator in Java is used to sort attributes of different objects. Comparable interface compares “this” reference with the object specified. Comparator in Java compares two different class objects provided.
How does a comparator work internally?
Returns a negative integer, zero, or a positive integer as the first argument is less than, equal to, or greater than the second. and boolean equals(Object obj); Comparator provides multiple sorting sequence. In other words, we can sort the collection on the basis of multiple elements such as id, name and price etc.