The java.util.EnumMap.size() method returns how many key-value mappings exist in this map.
Following is the declaration for java.util.EnumMap.size() method
public int size()
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This method returns the number of key-value mappings in this map.
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The following example shows the usage of java.util.EnumMap.size() method.
package com.tutorialspoint; import java.util.*; public class EnumMapDemo { // create an enum public enum Numbers { ONE, TWO, THREE, FOUR, FIVE }; public static void main(String[] args) { EnumMap<Numbers, String> map = new EnumMap<Numbers, String>(Numbers.class); // assosiate values in map map.put(Numbers.ONE, "1"); map.put(Numbers.TWO, "2"); map.put(Numbers.THREE, "3"); map.put(Numbers.FOUR, "4"); // print the map System.out.println("Map: " + map); // print the number of mappings of this map System.out.println("Number of mappings:" + map.size()); // remove value from Numbers.THREE map.put(Numbers.FIVE, "5"); // print the new number of mappings of this map System.out.println("Number of mappings:" + map.size()); } }
Let us compile and run the above program, this will produce the following result −
Map: {ONE=1, TWO=2, THREE=3, FOUR=4} Number of mappings:4 Number of mappings:5