NavigableMap size() Method in Java

Java 8Object Oriented ProgrammingProgramming

To get the size of NavigableMap, use the size() method. It returns the count of elements in the NavigableMap.

Let us first create a NavigableMap and add some elements to it −

NavigableMap<Integer,String> n = new TreeMap<Integer,String>();
n.put(5, "Tom");
n.put(9, "John");
n.put(14, "Jamie");
n.put(1, "Tim");
n.put(4, "Jackie");
n.put(15, "Kurt");
n.put(19, "Tiger");
n.put(24, "Jacob");

Now, get the size −

n.size();

The following is an example to implement the size() method to get the size of the NavigableMap −

Example

 Live Demo

import java.util.*;
public class Demo {
   public static void main(String[] args) {
      NavigableMap<Integer,String> n = new TreeMap<Integer,String>();
      n.put(5, "Tom");
      n.put(9, "John");
      n.put(14, "Jamie");
      n.put(1, "Tim");
      n.put(4, "Jackie");
      n.put(15, "Kurt");
      n.put(19, "Tiger");
      n.put(24, "Jacob");
      System.out.println("NavigableMap elements...\n"+n);
      System.out.println("The size of the NavigableMap = " + n.size());
   }
}

Output

NavigableMap elements...
{1=Tim, 4=Jackie, 5=Tom, 9=John, 14=Jamie, 15=Kurt, 19=Tiger, 24=Jacob}
The size of the NavigableMap = 8
raja
Published on 11-Jan-2019 11:53:26
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