TreeMapExample.java Source code

Introduction

Here is the source code for TreeMapExample.java

Source

import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import java.util.TreeMap;

public class TreeMapExample {
    public static void main(String[] args) {
        Map<Integer, String> map = new TreeMap<Integer, String>();

        // Add Items to the TreeMap
        map.put(new Integer(1), "One");
        map.put(new Integer(2), "Two");
        map.put(new Integer(3), "Three");
        map.put(new Integer(4), "Four");
        map.put(new Integer(5), "Five");
        map.put(new Integer(6), "Six");
        map.put(new Integer(7), "Seven");
        map.put(new Integer(8), "Eight");
        map.put(new Integer(9), "Nine");
        map.put(new Integer(10), "Ten");

        // Use iterator to display the keys and associated values
        System.out.println("Map Values Before: ");
        Set keys = map.keySet();
        for (Iterator i = keys.iterator(); i.hasNext();) {
            Integer key = (Integer) i.next();
            String value = (String) map.get(key);
            System.out.println(key + " = " + value);
        }

        // Remove the entry with key 6
        System.out.println("\nRemove element with key 6");
        map.remove(new Integer(6));

        // Use iterator to display the keys and associated values
        System.out.println("\nMap Values After: ");
        keys = map.keySet();
        for (Iterator i = keys.iterator(); i.hasNext();) {
            Integer key = (Integer) i.next();
            String value = (String) map.get(key);
            System.out.println(key + " = " + value);
        }
    }
}