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/* package whatever; // don't place package name! */
 
/* The class name doesn't have to be Main, as long as the class is not public. */
import com.sun.org.apache.xml.internal.security.utils.Base64; 
class Main
{
  public static void main (String[] args) throws java.lang.Exception
  {
  String encodedBytes ="LyJwNh9iPil3MyMSGRhWCCpXBExXAWZBGg1eFjNcShpSCmZxCwJSAC9TBDxbBTRfCw9KRDNbHkxHCzISBwNBAyNcRkxJAWZfBQlHASgSDgkTEilAAwtWRCRTHg9bATUSBANURCRXHg1fASg=";
 
String str="Hello World"; 
String base64_str=Base64.encode(str.getBytes("UTF-8")); 
 
  String message = Base64.decode(encodedBytes.getBytes("UTF-8")); 
  String paramString = "jl3dF2";
  int paramInt= 2;
  String str= "";
 
      System.out.println("----------------- START ---------------------");
           for (int i = 0; i < message.length(); i++)
      {
        int k = paramString.charAt(i % paramString.length());
        int j = message.charAt(i);
        k &= 1 << paramInt;
        str = str + (k ^ j);
      }
      System.out.println(str);
  }
}

Main.java:4: package com.sun.org.apache.xml.internal.security.utils does not exist
import com.sun.org.apache.xml.internal.security.utils.Base64; 
                                                     ^
Main.java:12: cannot find symbol
symbol  : variable Base64
location: class Main
String base64_str=Base64.encode(str.getBytes("UTF-8")); 
                  ^
Main.java:14: cannot find symbol
symbol  : variable Base64
location: class Main
  String message = Base64.decode(encodedBytes.getBytes("UTF-8")); 
                   ^
Main.java:17: str is already defined in main(java.lang.String[])
  String str= "";
         ^
4 errors

Standard output is empty