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Asked: 2020-06-11 03:43:32 +0800 CST 2020-06-11 03:43:32 +0800 CST

How to initialize a constant variable?

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I want to initialize a constant variable, which is 'final', but I also want to include it in the constructor of a class but I don't know if this is ok:

public class Avion
{
    private final BigDecimal limiteAltura;
    public Avion(String limiteAltura)
    {
        this.limiteAltura = new BigDecimal(limiteAltura);
    }
}

The constructor is supposed to initialize a field with qualifying values. It is initialized with a Stringwhich by default will be nullbut it gives me the impression that it can be done in another way. A constant has to be initialized at the time of its declaration or in the constructor. What I want to achieve is to be explicit not to ignore code.

java

1 Answers

  1. Best Answer
    private final BigDecimal limiteAltura;

    No, here you don't initialize it, here you declare it. It has the default value null, but you haven't initialized it.

    Your code is correct; as long as you only initialize it once (when declaring it or within each of the constructors) there is no problem.

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