java - Encrypt and Decrypt a String with RSA -

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i new bee java security , crypto. below code not return me correct decryption.

also please let me know recommendation using algorithm make strong key.

below code has 2 methods 1 encryption string , other decryption. 

public class testsecuritydiscussions {          public static byte[] encryptdata(keypair keys){              string rawdata = "hi how you>?";             cipher cipher = cipher.getinstance("rsa");             try {                 cipher.init(cipher.encrypt_mode, keys.getpublic());             } catch (exception e) {                 // todo auto-generated catch block                 e.printstacktrace();             }             byte[] encrypted = cipher.dofinal(rawdata.getbytes());              return encrypted;         }           public static string decryptdata(byte[] encrypted,keypair keys) {             cipher cipher = cipher.getinstance("rsa");             try {                 cipher.init(cipher.decrypt_mode, keys.getprivate());             } catch (exception e) {                  e.printstacktrace();             }             byte[] deycrypted = cipher.dofinal(encrypted);              return deycrypted.tostring();         }           public static void main(string[] args)   {             keypair keys = keypairgenerator.getinstance("rsa").generatekeypair();             byte[] keydata = encryptdata(keys);             system.out.println("======>"+decryptdata(keydata,keys));          }      }

i think problem line:

return decrypted.tostring();

byte strings give memory location via tostring(). should this:

return new string(decrypted);

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