请帮助解释一下我逆向出的java代码

Question

以下是我逆向出的Java代码，有冗余保护，看不太懂。麻烦解释一下，谢谢。

import java.io.PrintStream;

public class Prog8
{

public Prog8()
{
}

public static void main(String args[])
{
if(args.length != 1)
{
System.out.println("Usage: java Prog8 <serial code>");
System.exit(1);
}
x x1 = new x(args[0]);
x1.d();
}
}
class k
{

public k()
{
}

public String l(int i)
{
return Integer.toHexString(i);
}
}
class v
{

public v()
{
}

public void y(int i)
{
if(i == 1)
System.out.println("Yeehaaa! You made it, you got the valid serial code!");
else
System.out.println("Sorry, wrong serial, you need to try harder...");
}
}

class x
{

public x(String s)
{
g = s;
}

public void d()
{
boolean flag = false;
String s = "";
for(int i = 0; i < g.length(); i++)
s = s + (new k()).l(g.charAt(i) + (new z()).y());

if(s.equals((new y()).z()))
(new v()).y(1);
else
(new v()).y(0);
}

private String g;
}

class y
{

public y()
{
}

public String z()
{
return "5d347e8987883486798a798687793479827b7d82797986797834887c7d87";
}
}

class z
{

public z()
{
}

public int y()
{
return 20;
}
}

Answer 1

程序运行必须输入一个参数，否则结束程序运行。