relationship between abstract and inheriance class

[Anonymous]

THe abstract classes can have constructor ?
public abstract class Student
{
int[] id;
public Student(int length)
{
id = new int[length];
}
// abstract methods.
}
if I want a its subclass of Student to call super(), it does not work. Can anyone help me little.
public class SubStudent extends Student
{
public SubStudent()
{
super(4);
}
}
I got error like:
SubStudent.java: cannot resolve symbol
symbol : constructor Student ()
location: class Student
{
^
1 error

[Chris Cleverley]

Don't use jdk1.3, use jdk1.2.
I do not get this error with my jdk version.
Chris

[kevin jia]

Hi,
Although the original intention of construction abstract class is to give a outline for follow up development, but you can implement it like other normal class. For respect the keyword "abstract", you can't use "new" operator. I try the following program, it works well. I use JDK1.3.
abstract class Student
{
int[] id;
public Student(int length)
{
id = new int[length];
}
// abstract methods.
}
public class SubStudent extends Student {
public SubStudent() {
super(4);
}
public static void main(String[] args) {
SubStudent ss = new SubStudent();
System.out.println(ss.id[0]);
}
}
I hope it will help you.
kevin jia

[Jim Yingst]

ldcai- your code compiles fine for me using JDK 1.3. What line number does your compiler object to exactly? You write that it objects to the Student() constructor, but there is no Student() constructor anywhere in the code. I suspect you have a typo somewhere.

[maha anna]

I compiled with JDK1.2.2. It compiles fine. Also I could not see any error just by browsing the code also.
regds
maha anna