How i can swap value and key from hashmap and user give stringbuilder from keyboard and replace one word from stringbuilder with new value in java?Ι want to make a reverse trasnlation slang internet's dictionary.For example if I had given this string "laugh and lound " after tsanlation I want string "loI".I had create a hasmap which is my dictionary and contains this values{fyi", "for your information"); ("dae", "Does anyone else"); ("thx","thank you"); ("omg","Oh my god"); ("lol","laughing out lound");.Also if user givving input the string "laugh out and lound" take to oytput "lol".

My code is:
 package javaapplication6;

```
      import java.util.*; 
       import java.util.ArrayList; 
        import java.util.HashMap;
      import java.util.Scanner;

```

public class JavaApplication6 {

```
/**
 * @param args the command line arguments
 */

public static void main(String[] args) {

                       String threeWords;

                        //create stringbuilder
                        StringBuilder acronym = new StringBuilder();

                        Scanner scan = new Scanner(System.in);

                       //o xrhsths dinei eisodo thn protash poy thelei na metafrasei
                        System.out.println("Eisigage thn protasi sou pou theleis na metafraseis:\n ");
                        threeWords = scan.nextLine();
                        threeWords = threeWords.toLowerCase(); //Changing it to lower case
                          acronym.append(threeWords);
                           System.out.println(" To string pou eisigages einai: " + acronym +"\n");
                        //dhmiougroum ena pinaka pou periexei mia mia thn lejei jexorista apo thn protash pou 
                        //edose o xrhsths oste na mporoume na broume pio eukola thn leji pou einai gia metafrash sto
                        //lejiko
                        String[] threeWordsArray = threeWords.split(" ");

                        //dhmiougria lejikou me thn slang tou internet me thn xrisi hashmap
                        HashMap<String,String> dictionary = new HashMap <String,String>(10);

               //Prosthiki lejeon  sto lejiko mas

                        dictionary.put("fyi", "for your information");
                        dictionary.put("dae", "Does anyone else");
                        dictionary.put("thx","thank you");
                        dictionary.put("omg","Oh my god");
                        dictionary.put("lol","laughing out lound");

                        HashMap<String, String> reversedHashMap = new HashMap<String, String>();
                               for (String key : dictionary.keySet()){
                                 reversedHashMap.put(dictionary.get(key), key);
                                 } 

                            System.out.println("reversedHasmap"+reversedHashMap);
                            for(String word : threeWordsArray) {

                           if (reversedHashMap.containsKey(word)) {

                            String definition = reversedHashMap.get(word);
            System.out.println("h metafrash einai: \n" + definition);

                            int index=acronym.indexOf(word);
                            System.out.println("index:"+index);
                            acronym.insert(index,definition);
                         }
            else {
            System.err.println("Word not found");

                            }//end if

                        }//end for  

                       System.out.println("To string metafrasmeno einai: " + acronym);

}

```

}

but I have problem with for 
 for(String word : threeWordsArray) {

```
                           if (reversedHashMap.containsKey(word)) {

                            String definition = reversedHashMap.get(word);
            System.out.println("h metafrash einai: \n" + definition);

                            int index=acronym.indexOf(word);
                            System.out.println("index:"+index);
                            acronym.insert(index,definition);
                         }
            else {
            System.err.println("Word not found");

                            }//end if

                        }//end for  

```

It can not find the input which are match with reversedHashMap key.