Factorial quine program (outputs its own source code with variables changed, compiles new source, repeat)

Factorial12.java

import java.io.*;
import javax.tools.*;
class Factorial12 {
  static final char Q=34;
  static final int N=12;
  static final int M=1;
  public static void main(String[]a)throws Exception{
    if (N == 0) {
      System.out.println(M);
      System.exit(0);
    }
    String fn="Factorial"+(N-1)+".java";
    BufferedWriter out=new BufferedWriter(new FileWriter(fn));
    String s="import java.io.*;import javax.tools.*;class Factorial%d{static final char Q=34;static final int N=%d;static final int M=%d;public static void main(String[]a)throws Exception{if(N==0){System.out.println(M);System.exit(0);}String fn=%cFactorial%c+(N-1)+%c.java%c;BufferedWriter out=new BufferedWriter(new FileWriter(fn));String s=%c%s%c;out.write(String.format(s,N-1,N-1,N*M,Q,Q,Q,Q,Q,s,Q,Q,Q,Q,Q));out.close();JavaCompiler c=ToolProvider.getSystemJavaCompiler();c.run(null,null,null,fn);Class.forName(%cFactorial%c+(N-1)).getMethod(%cmain%c,a.getClass()).invoke(null,new Object[]{new String[]{}});}}";
    out.write(String.format(s,N-1,N-1,N*M,Q,Q,Q,Q,Q,s,Q,Q,Q,Q,Q));
    out.close();
    JavaCompiler c=ToolProvider.getSystemJavaCompiler();
    c.run(null,null,null,fn);
    Class.forName("Factorial"+(N-1)).getMethod("main",a.getClass()).invoke(null,new Object[]{new String[]{}});
  }
}