21.4. Rules for Implicit Conversions

Implicit conversions are considered in three distinct situations:

• If the type of an expression differs from the expected type:

  sqrt(Fraction(1, 4))
    // Calls fraction2Double since sqrt expects a Double

• If an object accesses a nonexistent member:

  new File("README").read
    // Calls file2RichFile since File has no read method

• If an object invokes a method whose parameters don’t match the given arguments:

  3 * Fraction(4, 5)
    // Calls int2Fraction since the * method of Int doesn't accept a Fraction