package inheritance

[hostel]

hi,
"a1" and "a2" in different source file.
/* package p1;
class a1 . */

/* package p1
class a2 extends a1*/

when i compiled a2 source file i got error saying "unresolved symbol"

plz tell me what to do , where i went wrong ..

thank u

[r035198x]

hi,
"a1" and "a2" in different source file.
/* package p1;
class a1 . */

/* package p1
class a2 extends a1*/

when i compiled a2 source file i got error saying "unresolved symbol"

plz tell me what to do , where i went wrong ..

thank u

You should compile a1 first.

[hostel]

You should compile a1 first.

a1 can be compiled without error when included package , but when i compile a2 including package name , then i get error saying "unresolved symbol". when i dont include package name then
they compile and run

[dmjpro]

plz send me the code...
then i can explain u clearly...
and one more thing , plz mention the jre environment and default classpath ............... ..
send me my requirements i am online
thannnkkkkkkkkk kkkkkkkssssssss sssssssssssssss sss

[hostel]

plz send me the code...
then i can explain u clearly...
and one more thing , plz mention the jre environment and default classpath ............... ..
send me my requirements i am online
thannnkkkkkkkkk kkkkkkkssssssss sssssssssssssss sss

//file name a1.java
package p1;
public class a1{
int a=1;
public int b=2;
private int c=4;
protected int d=3;
public a1()
{
System.out.prin tln("a="+a+"b=" +b+"c="+c+"d="+ d);
}
}

//file name a2.java
package p1;
class a2 extends p1.a1
{
a2()
{
System.out.prin tln("a="+a);
}
}

//file name demo.java
package p1;
public class demo
{
public static void main(String args[])
{
a1 ob1=new a1();
a2 ob2=new a2();
}
}

CLASSPATH
/bin/jdk1.6.0/bin/ //for jdk
/bin/jdk1.6.0/jre/lib/ //for runtime
.:/wind/javapgm/ //package p1(directory) exists in javapgm