Sure, the first thing that would help is filling in those methods a bit more.

Did you have any other specific questions?

Yes, please find the question below:
<snipped>

No, posting your homework assignment does not constitute specific questions. You need to make an effort to complete the assignment on your own. If you have difficulties, then post the code and the errors or questions you cannot figure out.

hi there,

I am stuck at somewhere same.

/* ISPN.java
* A class to represent an imaginary "International Standard Program Number"

*/

package tma01q1;

public class ISPN
{
private int[] authorId;
private int[] programId;

/**
* Creates a new instance of ISPN
*/
public ISPN(int[] anAuthorId, int[] aProgramId)
{
authorId = anAuthorId[] ;
programId = aProgramId[] ;
}

public boolean isValidLength()
{
if ((authorId.length + programId.length) == 6)


return true;

}

public boolean isAllValidDigits()
{
// TODO
return false;
}

public String getAuthorIdAsString()
{
// TODO
return null;
}

public String getProgramIdAsString()
{
// TODO
return null;
}

public int calculateCheckDigit()
{
// TODO
return 0;
}

public String toString()
{
// TODO
return null;
}

public boolean equals(ISPN ispn)
{
// TODO
return false;
}
}