Question: The Rational class in this chapter is defined as a subclass of java.lang.Number. Which of the following expressions is orrect? Rational.doubleValue ( ) ; new

The Rational class in this chapter is defined as a subclass of java.lang.Number. Which of the following expressions is orrect?
Rational.doubleValue();
new Rational(5,4).intValue();
new Rational(5,4).toDoubleValue();
Rational.doubleValue("5/4");
new Rational(5,4).doubleValue();
The Rational class in this chapter is defined as

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