RefactoringtoPatterns：ChainConstructors

你拥有多个构造子，其中包含了重复的代码。

将构造子串在一起，以使重复代码减到最少。

public class Loan {

...

public Loan(float notional, float outstanding, int rating, Date expiry) {

this.strategy = new TermROC();

this.notional = notional;

this.outstanding = outstanding;

this.rating =rating;

this.expiry = expiry;

}

public Loan(float notional, float outstanding, int rating, Date expiry, Date maturity) {

this.strategy = new RevolvingTermROC();

this.notional = notional;

this.outstanding = outstanding;

this.rating = rating;

this.expiry = expiry;

this.maturity = maturity;

}

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