Package protected class can be accessed from another package.

Here are the sample code:
::::::::::::::
Bar.java
::::::::::::::

package bar;

import foo.Secrete;

public class Bar {
  public static void main(String args[]) {
    try {
      Secrete s = new Secrete(" Hacker breakin");
      System.out.println("The secrete message is \"" + s.getMsg() + "\"");
    } catch (Exception e) {
      e.printStackTrace();
    }
  }
}
::::::::::::::
Foo.java
::::::::::::::

package foo;

public class Foo {
  public static void main(String args[]) {
    Secrete s = new Secrete("Package only");
    System.out.println("The secrete message is \"" + s.getMsg() + "\"");
  }
}

class Secrete {
  private String message;

  Secrete(String msg) {
    message = msg;
  }

  public String getMsg() {
    return "Package secrete" + message;
  }

  private void setMsg(String msg) {
    message = msg;
  }
}

::::::::::::::
Secrete.java
::::::::::::::

package foo;

public class Secrete {
  private String message;

  public Secrete(String msg) {
    message = msg;
  }

  public String getMsg() {
    return "Fake class message" + message;
  }

  public void setMsg(String msg) {
    message = msg;
  }
}


Foo.java contained a package protected class Secrete in package foo.
Bar.java imports foo.Secrete class
Secrete.java is a public version of the Secrete class also packaged in foo

Compile Foo.java first:
% javac -d . Foo.java
% javac -d . Bar.java
Bar.java:4: Can't access class foo.Secrete. Only public classes and interfaces in other packages can be accessed.
import foo.Secrete;
       ^
1 error

Now compile the fake Secrete class and make it work:
% javac -d . Secrete.java
% javac -d . Bar.java
% java bar.Bar
The secrete message is "Fake class message Hacker breakin"

Now compile back the protected Secrete class and break into the Secrete class
with the precompiled Bar.class:
% javac -d . Foo.java
% java bar.Bar
The secrete message is "Package secrete Hacker breakin"