HashTable, Properties, Dictionary Data Structure in Java Programming Language

                 In this post, we will see HashTable, Properties, Dictionary Data Structure in Java Programming Language

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Program Code: (HashTableProg.java) 

import java.util.*; public class HashTableProg {    public static void main(String args[]) {             Hashtable cls = new Hashtable();       Enumeration rollno;       int r;       cls.put(35,"Parag");       cls.put(42,"Mayur");       cls.put(51,"Manish");       cls.put(60,"Sumit");             rollno = cls.keys();             while(rollno.hasMoreElements()) {          r = (int) rollno.nextElement();          System.out.println(r + ": " + cls.get(r));       }              System.out.println();             cls.put(51, "Ramesh");       System.out.println("New Mapping for 51:"+ cls.get(51));    } }

  

Output:

parag@parag-Inspiron-N4010:~/Desktop/prog$ javac HashTableProg.java Note: HashTableProg.java uses unchecked or unsafe operations. Note: Recompile with -Xlint:unchecked for details. parag@parag-Inspiron-N4010:~/Desktop/prog$ java HashTableProg 42: Mayur 51: Manish 60: Sumit 35: Parag New Mapping for 51:Ramesh

 

Program Code: (PropProg.java) 

import java.util.*; public class PropProg {    public static void main(String args[]) {             Properties cls = new Properties();       Enumeration rollno;       String r;       cls.setProperty("Thirty Five","Parag");       cls.setProperty("Forty Two","Mayur");       cls.setProperty("Fifty One","Manish");       cls.setProperty("Sixty","Sumit");             rollno = cls.keys();             while(rollno.hasMoreElements()) {          r = (String) rollno.nextElement();          System.out.println(r + ": " + cls.getProperty(r));       }              System.out.println();             cls.setProperty("Fifty One", "Ramesh");       System.out.println("New Mapping for Fifty One:"+ cls.getProperty("Fifty One"));    } }

  

Output:

parag@parag-Inspiron-N4010:~/Desktop/prog$ javac PropProg.java parag@parag-Inspiron-N4010:~/Desktop/prog$ java PropProg Sixty: Sumit Thirty Five: Parag Fifty One: Manish Forty Two: Mayur New Mapping for Fifty One:Ramesh