Java uses HashMap to encrypt and decrypt strings

Package P3;
Import Java.util.HashMap;

Import Java.util.Map;
   public class Encryption {//String str;
   Static map<character,character> map=new hashmap<character,character> ();
    Static Map<character,character>map1=new hashmap<character,character> ();
        Encryption () {String a= "abcdefghijklmnopqrstuvwsvz*";
        String b= "Veknohzf*iljxdmygbrcswqupta";
            for (int i=0;i<a.length (); i++) {Map.put (A.charat (i), B.charat (i));
        Map1.put (B.charat (i), A.charat (i));
       } public static string encrypt (String str) {string s2= str.tolowercase ();
       String d = "";
       for (int i = 0; i < s2.length (); i++) {d = d + map.get (S2.charat (i));
    return D;
        public static string decrypt (String str) {string d = "";
        for (int i = 0; i < str.length (); i++) {d = d + map1.get (Str.charat (i));
    return D;
 }
}

The    entire method is loaded into the class, it needs to be encrypted and decrypted just call

Encryption e1=new encryption ();
String stre= "Hello*world";
String Stre1=e1.encrypt (stre);
System.out.println (stre1);
System.out.println (E1.decrypt (stre1));

The program used for testing

Output results:

Fojjmaqmbjn
Hello*world