Question

Write code that maps Strings to the Integers which represent the lengths of the Strings.

Create a class with a Map <String, Integer>.

Write one method called addStringToMap() that takes a String parameter and adds an entry to the Map with the String as the key and the length of the String as the value. Note that, if there is already an entry with that String as the key, nothing will happen when you add the entry.

Write a method called printOutMap() that prints out all the entries from the Map.

Main should call addStringToMap() repeatedly to add at least ten Strings, including at least one pair of duplicate Strings (like "John" and "John") and at least one other pair that are not duplicates but have the same length (like "Bob" and "Sue".) The Strings may be hard-coded; you do not need to take user input. Main should then call the printOutMap method.

Answer 1

import java.util.HashMap;
import java.util.Map;

public class Mapp {

   Map<String, Integer> hm = new HashMap<String, Integer>();
   public static void main(String[] args) {
       Mapp mp=new Mapp();
// calling the method addStringToMap
       mp.addStringToMap("hello");
       mp.addStringToMap("John");
       mp.addStringToMap("Congratulation");
       mp.addStringToMap("John");
       mp.addStringToMap("Bob");
       mp.addStringToMap("Rohit");
       mp.addStringToMap("Sue");
       mp.addStringToMap("Constructor");
       mp.addStringToMap("Friends");
       mp.addStringToMap("Helmet");
       mp.addStringToMap("Mango");
       mp.addStringToMap("MAcculam");
       mp.addStringToMap("Salman");
      
       mp.printOutMap();
   }
  
   // below method used to print the Map value kye and string
   private void printOutMap() {
       for (Map.Entry<String, Integer> me : hm.entrySet()) {
   System.out.print(me.getKey() + ":");
   System.out.println(me.getValue());
   }
      
   }
   // below mthod uses to calculate the length of the string
   //and then store the corresponding string
   private void addStringToMap(String name) {
       // find the length of the string
       int l=name.length();
       hm.put(name, l);
      
   }

}
----------------------------------------------

SAMPLE OUTPUT:

Rohit:5
Sue:3
Helmet:6
Bob:3
Constructor:11
Friends:7
Salman:6
John:4
Mango:5
hello:5
MAcculam:8
Congratulation:14
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SUMMARY:

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