Re: Protected methods in Object class

From:
Lew <lew@lewscanon.com>
Newsgroups:
comp.lang.java.programmer
Date:
Thu, 22 Nov 2007 18:49:57 -0500
Message-ID:
<1a6dnep-erA4iNvanZ2dnUVZ_t-gnZ2d@comcast.com>
ankur wrote:

public class SubClass extends SuperClass{

public class TestClass {
 public static void main(String[] args) {


Please do not use TAB characters in Usenet posts.

    SubClass obj = new SubClass();
    obj.messageinsub(); // should capitalize each word part: messageInSub()
    obj.messageinsuper();


You're in the same package.

 }
}


A class can access protected members of another class in its same package.

However, when I try to use clone() I get an error:

===
package testit;
public class Super
{
     protected void message()
     {
         System.out.println( "Super.message()" );
     }
}

===
package testit;
public class Sub extends Super
{
     public void tell()
     {
         message();
         System.out.println( "Sub.tell()" );
     }
}

===
package testit;
public class Checkit
{
     public static void main(String[] args)
     {
         Sub sub = new Sub();
         sub.tell();
         sub.message();
         Sub s2 = (Sub) sub.clone(); // line 9
     }
}

===
Compilation of Checkit:
projects/testit/src/testit/Checkit.java:9: clone() has protected access in
java.lang.Object
         Sub s2 = (Sub) sub.clone();

--
Lew

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