java.util.TreeMap

java.util.TreeMap class

java.util.TreeMap class

• We can store group of objects in the form of key-value pairs in Hashtable object.
• Both key and values are objects only.
• Keys can be unique and values can be duplicate.
• Here group of objects means, it can allow us to store same type of objects only.
• Same type means, assuming that all objects are in the form of integer types.
• If trying to insert different type of objects then we ll get run time exception as ClassCastException
• Size will increase dynamically.
• Order is guarantee for ascending order.

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Program         :       Example on TreeMap class

Program name  :       TMDemo1.java

Output            :         

      {1=Nireekshan, 2=Sravan, 3=Hari, 9=Mohan, 10=Mouli}

     

import java.util.TreeMap;

class TMDemo1

{

       public static void main(String args[])

       {

             TreeMap treeMap = new TreeMap();

              

             treeMap.put(1, "Nireekshan");

             treeMap.put(2, "Sravan");
             treeMap.put(10, "Mouli");

             treeMap.put(9, "Mohan");

             treeMap.put(3, "Hari");
             

             System.out.println(treeMap);

       }

}

Compile       :         javac TMDemo1.java

Run             :         java TMDemo1

Output        :         

     {1=Nireekshan, 2=Sravan, 3=Hari, 9=Mohan, 10=Mouli}

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Thanks for your time.

Nireekshan