Blue Pelican Java: Help with Encryption/Decryption

Hi im having trouble with this:

import java.io.*;
import java.util.*;
public class Crypto
{
public void Crypto(String sntnc)
{
}

public String encrypt( String sentence)
{
String mystring = sentence.replace("v", "ag' ,r");
mystring = mystring.replace("m", "ssad");
mystring = mystring.replace("b", "dug>?/");
mystring = mystring.replace("g", "jeb..w");
mystring = mystring.replace("oo", "??.");
return mystring;

}

public String decrypt(String sentence)
{

String mystring = sentence.replace("ag' ,r", "v");
mystring = mystring.replace("ssad", "m");
mystring = mystring.replace("dug>?/", "b");
mystring = mystring.replace("jeb..w", "g");
mystring = mystring.replace("??.", "oo");
return mystring;
}

}





import java.io.*;
import java.util.*;
public class Tester
{
public static void main(String args[])
{

Scanner kbReader = new Scanner(System.in);
System.out.print("Enter a sentence that is to be encrypted: ");
String sntnc = kbReader.nextLine();
System.out.println("Original sentence = " + sntnc);

Crypto myCryptObj = new Crypto();
String encryptdSntnc = myCryptObj.encrypt(sntnc);
System.out.println("Encrypted sentence = " + encryptdSntnc);

String decryptdSntnc = myCryptObj.decrypt(encryptdSntnc);
System.out.println("Decrypted sentence = " + decryptdSntnc);
}
}

C:\Users\Desktop>javac Tester.java
Tester.java:14: cannot find symbol
symbol : class Crypto
location: class Tester
Crypto myCryptObj = new Crypto();
^
Tester.java:14: cannot find symbol
symbol : class Crypto
location: class Tester
Crypto myCryptObj = new Crypto();
^
2 errors

Help Please!