30 HashSet

 

/ *
* Using the stored string and traversing HashSet
*
* the Set features:
* disorder (sequential storage and reading may not be the same)
* must be unique
* not an integer index

On the contrary List

*/

public  class HashSetDemo {
     public  static  void main (String [] args) {
         // create the collection object 
        HashSet <String> HS = new new HashSet <String> (); 

        // add elements 
        hs.add ( " Hello " ); 
        hs.add ( " World " ); 
        hs.add ( " Java " );
 //         hs.add ( "Java"); 

        // traversing a collection of objects 
        for (String S: HS) { 
            System.out.println (S); 
        } 
    } 
}

 

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