Hi to all,
Hope everyone is fine . I have a problem with lab as
mentioned in subject regarding (Exercise4 : Constructor) . Actually in
the modification it is being described that pass average as a
parameter and created annaRecord object with newly constructor . I
want to ask how , actually i try the things but it is of no use, I
couldn't get the result .
What I understand is that I have to pass five parameters
to consructor including name, mathGrade, englishGrade, scienceGrade,
and average. First i tried this.
public StudentRecord(String name, double mGrade, double eGrade,
double sGrade, double average){
this(name, mGrade, eGrade, sGrade);
this.average = average;
}
and in the ConstructorExample class I call it like
this.
StudentRecord annaRecord = new StudentRecord("Anna", 10, 20, 30,
annaRecord.getAverage());
but after it, it shwos the error that " variable
annaRecord might not have been initialized ".
why this is happened although i made a object annaRecord
in the statement?
Then I made every field of StudentRecord class static ,
also made the getAverage() , getMath() , getEnglish(), and getScience
methods static and try this.
public StudentRecord(String name, double mGrade, double eGrade,
double sGrade, double average){
this(name, mGrade, eGrade, sGrade);
this.average = average;
System.out.println("name = " + name + " and average = " +
average);
}
and call it like this.
StudentRecord annaRecord = new StudentRecord("Anna", 10, 20, 30,
StudentRecord.getAverage());
ok there is no error but when i run the program it shows
the output like
name = Anna and average = 0.0
why this show zero average ? tell me plz.
What I try to do is that pass all five parameters
including name, math , sciene, english grades and then as a fifth
parameter call getAverage() method which return average of passed
math, science and english grades parameters and these all values go to
StudentRecord constructor and finally print name and average of
annaRecord
When i examine my logic I conclude that although I
call the getAverage() method but I didn't set math, english and
science grades.
Please give me some hint that how can I do this by
passing five parameters as i mention above to accomplish the task and
also want to ask that when I made fields and methods static all errors
removed although i didn't get the result, is there any way to solve
this without made fields and methods static?
Is there any other logic to solve this problim please
tell me I really appreciate it
Thanks in advance
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