Java Comparable - Implementing Comparable Interface - Learn how to implement the Comparable interface in Java with examples. Understand sorting and ordering of objects using Comparable.
Java Comparable interface Example The example below shows how to implement the Comparable interface in a user defined class and define the compareTo() method to make the objects of that class comparable. import java.time.LocalDate; import java.util.Objects; class Employee implements Comparable<Emplo...
Now, suppose we want to sort movies by their rating and names as well. When we make a collection element comparable(by having it implement Comparable), we get only one chance to implement the compareTo() method. The solution is usingComparator. Using Comparator Unlike Comparable, Comparator is...
So now we know that if we want to sort java object array or list, we need to implement java Comparable interface to provide default sorting and we should implement java Comparator interface to provide different ways of sorting. We can also create separate class that implementsComparatorinterface ...
We need to implement the java.lang.Comparable interface in the class to use it and compare it with the instances. This interface has a single method called compareTo(object), which should be in line with the other methods of the object. This function also defines the natural order of the...
Now, suppose we want sort movies by their rating and names also. When we make a collection element comparable(by having it implement Comparable), we get only one chance to implement the compareTo() method. The solution is usingComparator. ...
TheComparatorinterface defines acompare(arg1, arg2)methodwith two arguments that represent compared objects, and works similarly to theComparable.compareTo()method. 4.1. CreatingComparators To create aComparator,we have to implement theComparatorinterface. ...
In this Java tutorial, you will learn How to Find Maximum Occurrence of Words from given Text File? Here is a logic for getting top element: Create a class CrunchifyComparable that can store the String value of the word and the number of occurrences it appears. Implement the Comparable inte...
Sorting the array or list of objects where wecan not modify the source codeto implementComparableinterface. Usinggroup by sorton list or array of objects on multiple different fields. 2. Overriding compare() Method To enable total ordering on objects, we need to create a class that implements ...
keyExtractor- the function used to extract theComparablesort key Returns: a lexicographic-order comparator composed of this and then theComparablesort key. Throws: NullPointerException- if the argument is null. Since: 1.8 See Also: comparing(Function),thenComparing(Comparator) ...