Sorting with Comparable and Comparator in Java.Bengali-Ep:32
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Chapters ❤
0:00 Introduction
00:21 Theory & A Sorting Scenario implement
04:59 How do the sort() method of Collections class work?
07:29 Implementing a scenario using Comparable interface
20:55 Comparable interface theory
23:02 Comparable interface code implement
38:32 Implementing a scenario using Comparator interface
42:41 Comparator interface theory
45:20 Comparator interface code implementation
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Note:
Java was developed by Sun Microsystems (which is now the subsidiary of Oracle) in the year 1995. James Gosling is known as the father of Java. Before Java, its name was Oak. Since Oak was already a registered company, James Gosling and his team changed the name from Oak to Java.
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How does the sort() method of the Collections class work?
The Collections.sort has two overloaded methods :
public static void sort(List list): Sort the list into ascending order, the natural ordering of its element.
public static void sort(List list, Comparator c): Sort the list according to the specified comparator.
Internally the Sort method does call Compare method of the classes it is sorting. To compare two elements, it asks “Which is greater?” Compare method returns :
If both the objects are equal, returns 0
If the first object is greater than the second, return a value greater than 0
If the second object is greater than the first, returns a value less than 0
Java provides two interfaces to sort objects using data members of the class:
Comparator
Comparable
Comparator :
A comparator interface is used to order the objects of a user-defined class. This interface is present in java.util package and contains 2 methods compare(Object obj1, Object obj2) and equals(Object element). Using a comparator, we can sort the elements based on data members.
Comparable:
The Comparable interface is used to compare an object of the same class with an instance of that class, it provides the ordering of data for objects of the user-defined class. The class has to implement the java.lang.Comparable interface to compare its instance, it provides the compareTo method that takes a parameter of the object of that class.
The Comparable interface contains the method compareTo decide the order of the elements.