C:\>cdc
C:\>type Maher.java
public class Maher {
    public static void main(String[] args) {
        Richard r = new Richard();
        r.dosomething();
    }
}

class Richard {
    public void dosomething() {
        for(int i = 0; i < 3; i++) {
            print();
        }
    }
    private static void print() {
        System.out.println("Ofuscation sucks");
    }
}
C:\>javac Maher.java
C:\>java -cp . Maher
Ofuscation sucks
Ofuscation sucks
Ofuscation sucks
C:\>jad -o Maher.class
Parsing Maher.class...The class file version is 50.0 (only 45.3, 46.0 and 47.0 a
re supported)
 Generating Maher.jad
C:\>type Maher.jad
// Decompiled by Jad v1.5.8e. Copyright 2001 Pavel Kouznetsov.
// Jad home page: http://www.geocities.com/kpdus/jad.html
// Decompiler options: packimports(3)
// Source File Name:   Maher.java
public class Maher
{
    public Maher()
    {
    }
    public static void main(String args[])
    {
        Richard richard = new Richard();
        richard.dosomething();
    }
}
C:\>jad -o Richard.class
Parsing Richard.class...The class file version is 50.0 (only 45.3, 46.0 and 47.0
 are supported)
 Generating Richard.jad
C:\>type Richard.jad
// Decompiled by Jad v1.5.8e. Copyright 2001 Pavel Kouznetsov.
// Jad home page: http://www.geocities.com/kpdus/jad.html
// Decompiler options: packimports(3)
// Source File Name:   Maher.java
import java.io.PrintStream;
class Richard
{
    Richard()
    {
    }
    public void dosomething()
    {
        for(int i = 0; i < 3; i++)
            print();
    }
    private static void print()
    {
        System.out.println("Ofuscation sucks");
    }
}
C:\>jar cvf rm.jar Maher.class Richard.class
added manifest
adding: Maher.class(in = 317) (out= 241)(deflated 23%)
adding: Richard.class(in = 520) (out= 368)(deflated 29%)
C:\>java -cp rm.jar Maher
Ofuscation sucks
Ofuscation sucks
Ofuscation sucks
C:\>type rm.pro
-injars  rm.jar
-outjars rmx.jar
-libraryjars  <java.home>/lib/rt.jar
-keep public class Maher {
    public static void main(java.lang.String[]);
}
C:\>java -jar proguard.jar @rm.pro
ProGuard, version 4.2
Reading program jar [C:\rm.jar]
Reading library jar [C:\SUNJava\jdk1.6.0\jre\lib\rt.jar]
Preparing output jar [C:\rmx.jar]
  Copying resources from program jar [C:\rm.jar]
C:\>java -cp rmx.jar Maher
Ofuscation sucks
Ofuscation sucks
Ofuscation sucks
C:\>jar xvf rmx.jar
 inflated: META-INF/MANIFEST.MF
 inflated: Maher.class
 inflated: a.class
C:\>jad -o Maher.class
Parsing Maher.class...The class file version is 50.0 (only 45.3, 46.0 and 47.0 a
re supported)
 Generating Maher.jad
C:\>type Maher.jad
// Decompiled by Jad v1.5.8e. Copyright 2001 Pavel Kouznetsov.
// Jad home page: http://www.geocities.com/kpdus/jad.html
// Decompiler options: packimports(3)
public class Maher
{
    public Maher()
    {
    }
    public static void main(String args[])
    {
        new a();
        a.a();
    }
}
C:\>jad -o a.class
Parsing a.class...The class file version is 50.0 (only 45.3, 46.0 and 47.0 are s
upported)
 Generating a.jad
C:\>type a.jad
// Decompiled by Jad v1.5.8e. Copyright 2001 Pavel Kouznetsov.
// Jad home page: http://www.geocities.com/kpdus/jad.html
// Decompiler options: packimports(3)
import java.io.PrintStream;
final class a
{
    a()
    {
    }
    public static void a()
    {
        for(int i = 0; i < 3; i++)
            System.out.println("Ofuscation sucks");
    }
}