AbstractMap size() Method in Java with Examples Last Updated : 26 Oct, 2018 Comments Improve Suggest changes Like Article Like Report The AbstractMap.size() method of AbstractMap class is used to get the size of the map which refers to the number of the key-value pair or mappings in the Map. Syntax: AbstractMap.size() Parameters: The method does not take any parameters. Return Value: The method returns the size of the map which also means the number of key-value pairs present in the map. Below programs illustrates the working of AbstractMap.size(): Program 1: Mapping String Values to Integer Keys. Java // Java code to illustrate the size() method import java.util.*; public class Abstract_Map_Demo { public static void main(String[] args) { // Creating an empty AbstractMap AbstractMap<Integer, String> abs_map = new TreeMap<Integer, String>(); // Mapping string values to int keys abs_map.put(10, "Geeks"); abs_map.put(15, "4"); abs_map.put(20, "Geeks"); abs_map.put(25, "Welcomes"); abs_map.put(30, "You"); // Displaying the AbstractMap System.out.println("Initial Mappings are: " + abs_map); // Displaying the size of the map System.out.println("The size of the map is " + abs_map.size()); } } Output: Initial Mappings are: {10=Geeks, 15=4, 20=Geeks, 25=Welcomes, 30=You} The size of the map is 5 Program 2: Mapping Integer Values to String Keys. Java // Java code to illustrate the size() method import java.util.*; public class Abstract_Map_Demo { public static void main(String[] args) { // Creating an empty AbstractMap AbstractMap<String, Integer> abs_map = new TreeMap<String, Integer>(); // Mapping int values to string keys abs_map.put("Geeks", 10); abs_map.put("4", 15); abs_map.put("Geeks", 20); abs_map.put("Welcomes", 25); abs_map.put("You", 30); // Displaying the AbstractMap System.out.println("Initial Mappings are: " + abs_map); // Displaying the size of the map System.out.println("The size of the map is " + abs_map.size()); } } Output: Initial Mappings are: {4=15, Geeks=20, Welcomes=25, You=30} The size of the map is 4 Note: The same operation can be performed with any type of Mappings with variation and combination of different data types. Comment More infoAdvertise with us Next Article AbstractMap size() Method in Java with Examples C chinmoy lenka Follow Improve Article Tags : Misc Java Java-Collections Java - util package Java-lang package Java-Functions Java-AbstractMap +3 More Practice Tags : JavaJava-CollectionsMisc Similar Reads AbstractSet size() method in Java with Example The size() method of AbstractSet in Java is used to get the size for this instance of the AbstractSet. It returns an integer value which is the size for this instance of the AbstractSet. Syntax: public int size() Parameters: This function has no parameters. Returns: The method returns an integer val 2 min read AbstractCollection size() Method in Java with Examples The size() method of Java AbstractCollection is used to get the size of the Collection or the number of elements present in the Collection.Syntax: AbstractCollection.size() Parameters: The method does not take any parameter.Return Value: The method returns the size or the number of elements present 2 min read BitSet size() Method in Java with Examples The size() Method of BitSet class in Java is used to know the size of this BitSet. This size is equal to the number of bits, each element has occupied in the BitSet. The maximum element in the set is the size - the first element Syntax: BitSet.hashCode() Parameters: The method does not accept any pa 2 min read ArrayList size() Method in Java with Examples In Java, the size() method is used to get the number of elements in an ArrayList.Example 1: Here, we will use the size() method to get the number of elements in an ArrayList of integers.Java// Java program to demonstrate the use of // size() method for Integer ArrayList import java.util.ArrayList; p 2 min read AbstractSequentialList size() method in Java with Example The size() method of AbstractSequentialList in Java is used to get the size for this instance of the AbstractSequentialList. It returns an integer value which is the size for this instance of the AbstractSequentialList. Syntax: public int size() Parameters: This method does not accepts any parameter 2 min read Like