Nov 05
Cedric has has opined on Why chaining constructors is bad.
I have always disliked the names that constructors have in Java (e.g. the same name of the class).
I now consider having one constructor (which isn’t public) and then having static creation methods which call the constructor correctly:
Person p = Person.createWithLastName(lastname);
Person p = Person.createWithFullNames(firstname, lastname);
With an example like this, it is probably overkill. But if you find yourself with many constructors, and it is hard to remember which one you should use, then it is is nice to do this.
Of course, you often refactor these methods into a Creation Factory seperately.
November 5th, 2004 at 5:06 pm
But you are using different names again. Why not an overloaded create() method?
I can remember what parameters to pass but I will most likely not remember how you called that method (was it “withFullNames” or “withFullName”?).
November 5th, 2004 at 5:44 pm
I prefer being able to type in my IDE:
Person p = Person.CTRL SPACE
and choose the method that makes sense.
A better example is shown in “Refactoring to Patterns” which migrates:
public class Loan … {
public Loan(double commitment, int riskRating, Date maturity) {
this(commitment, 0.00, riskRating, maturity, null);
}
public Loan(double commitment, int riskRating, Date maturity, Date expiry) {
this(commitment, 0.00, riskRating, maturity, expiry);
}
public Loan(double commitment, double outstanding, int customerRating, Date maturity, Date expiry) {
this(null, commitment, outstanding, customerRating, maturity, expiry);
}
public Loan(CapitalStrategy capitalStrategy, double commitment, int riskRating, Date maturity, Date expiry) {
this(capitalStrategy, commitment, 0.00, riskRating, maturity, expiry);
}
public Loan(CapitalStrategy capitalStrategy, double commitment, double outstanding, int riskRating, Date maturity, Date expiry) {
…. do the work ….
}
}
to:
public class Loan … {
Loan(capitalStrategy, commitment, outstanding, riskRating, maturity, expiry);
createTermLoan(commitment, riskRating, maturity);
createTermLoan(capitalStrategy, commitment, outstanding, riskRating, maturity);
createRevolver(commitment, outstanding, riskRating, expiry);
createRevolver(capitalStrategy, commitment, outstanding, riskRating, maturity);
createRCTL(commitment, outstanding, riskRating, maturity, expiry);
createRCTL(capitalStrategy, commitment, outstanding, riskRating, maturity);
}
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