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Retrieve TreeMap size in Java
Get the TreeMap size using the size() method.
First, create a TreeMap and add elements to it −
TreeMap<Integer,String> m = new TreeMap<Integer,String>(); m.put(1,"PHP"); m.put(2,"jQuery"); m.put(3,"JavaScript"); m.put(4,"Ruby"); m.put(5,"Java"); m.put(6,"AngularJS"); m.put(7,"ExpressJS");
Count the number of elements in the above TreeMap or get the size using the size() method as shown below −
m.size()
To get the size of TreeMap, the following is the code −
Example
import java.util.*; public class Demo { public static void main(String args[]) { TreeMap<Integer,String> m = new TreeMap<Integer,String>(); m.put(1,"PHP"); m.put(2,"jQuery"); m.put(3,"JavaScript"); m.put(4,"Ruby"); m.put(5,"Java"); m.put(6,"AngularJS"); m.put(7,"ExpressJS"); System.out.println("TreeMap Elements...
"+m); System.out.println("
Size of TreeMap: " + m.size()); } }
Output
TreeMap Elements... {1=PHP, 2=jQuery, 3=JavaScript, 4=Ruby, 5=Java, 6=AngularJS, 7=ExpressJS} Size of TreeMap: 7
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