![]() An ArrayList is a dynamic data structure that stores elements in it dynamically, that is it does not have any size limits. It usually inherits the properties of the AbstractList class. Before getting started with the topic of sorting ArrayList in java, let us get a short overview of what is an ArrayList in java.Īrraylist in java : An ArrayList** in java is a Collections framework class which exists inside the java.util package. Let's see the example of sorting the elements of List on the basis of age and name.In this article, we are going to learn about how to sort ArrayList in java. ![]() It returns a lexicographic-order comparator with a function that extracts a long sort key. It returns a lexicographic-order comparator with a function that extracts a int sort key.ĭefault Comparator thenComparingLong(ToLongFunction keyExtractor) It returns a lexicographic-order comparator with a function that extracts a double sort key.ĭefault Comparator thenComparingInt(ToIntFunction keyExtractor) It returns a lexicographic-order comparator with a function that extracts a key to be compared with the given Comparator.ĭefault Comparator thenComparingDouble(ToDoubleFunction keyExtractor) It returns a lexicographic-order comparator with a function that extracts a Comparable sort key.ĭefault Comparator thenComparing(Function keyExtractor, Comparator ke圜omparator) It returns a lexicographic-order comparator with another comparator.Ĭomparator thenComparing(Function keyExtractor) It returns comparator that contains reverse of natural ordering.ĭefault Comparator thenComparing(Comparator other) ![]() It returns comparator that contains reverse ordering of the provided comparator. It returns a comparator that treats null to be greater than non-null elements. Static Comparator nullsLast(Comparator comparator) ![]() It returns a comparator that treats null to be less than non-null elements. Static Comparator nullsFirst(Comparator comparator) It returns a comparator that compares Comparable objects in natural order. It is used to compare the current object with the specified object. It accepts a function that extracts a long sort key from a type T, and returns a Comparator that compares by that sort key. Static Comparator comparingLong(ToLongFunction keyExtractor) It accepts a function that extracts an int sort key from a type T, and returns a Comparator that compares by that sort key. Static Comparator comparingInt(ToIntFunction keyExtractor) It accepts a function that extracts a double sort key from a type T, and returns a Comparator that compares by that sort key. Static Comparator comparingDouble(ToDoubleFunction keyExtractor) It accepts a function that extracts a sort key from a type T, and returns a Comparator that compares by that sort key using the specified Comparator. Static Comparator comparing(Function keyExtractor, Comparator ke圜omparator) It accepts a function that extracts a Comparable sort key from a type T, and returns a Comparator that compares by that sort key. It compares the first object with second object.Ĭomparator comparing(Function keyExtractor) Methods of Java 8 Comparator Interface Method Now, we can use the Comparator interface as the assignment target for a lambda expression or method reference. Java 8 Comparator interface is a functional interface that contains only one abstract method. This class contains three fields rollno, name and age and a parameterized constructor. In this example, we have created 4 java classes: Let's see the example of sorting the elements of List on the basis of age and name. Java Comparator Example (Non-generic Old Style) Public void sort(List list, Comparator c): is used to sort the elements of List by the given Comparator. Method of Collections class for sorting List elements ![]() Collections class provides methods for sorting the elements of List type elements also. However, we cannot sort the elements of List. If collection elements are of Set or Map, we can use TreeSet or TreeMap. Public boolean equals(Object obj) It is used to compare the current object with the specified object.Ĭollections class provides static methods for sorting the elements of a collection. Public int compare(Object obj1, Object obj2) It compares the first object with the second object. Methods of Java Comparator Interface Method It provides multiple sorting sequences, i.e., you can sort the elements on the basis of any data member, for example, rollno, name, age or anything else. This interface is found in java.util package and contains 2 methods compare(Object obj1,Object obj2) and equals(Object element). Java Comparator interface is used to order the objects of a user-defined class. ![]()
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