Otherwise, the type of the throws clause is the type given in the method declaration

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A method invocation expression can throw an exception type E iff either: The method to be invoked is of the form PrimaryIdenti er and the Primary expression can throw E; or

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Some expression of the argument list can throw E; or E is listed in the throws clause of the type of method that is invoked

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Otherwise, if unchecked conversion was necessary for the method to be applicable then the result type is the erasure ( 46) of the method s declared return type

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EXPRESSIONS

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Compile-Time Step 2: Determine Method Signature 15122

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151227 Inferring Type Arguments Based on Actual Arguments In this section, we describe the process of inferring type arguments for method and constructor invocations This process is invoked as a subroutine when testing for method (or constructor) applicability ( 151222 - 151224)

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We will use the following notational conventions in this section:

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Type expressions are represented using the letters A, F, U, V and W The letter A is only used to denote the type of an actual parameter, and F is only used to denote the type of a formal parameter Type parameters are represented using the letters S and T Arguments to parameterized types are represented using the letters X, Y Generic type declarations are represented using the letters G and H

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The process of type inference is inherently complex Therefore, it is useful to give an informal overview of the process before delving into the detailed speci cation Inference begins with an initial set of constraints Generally, the constraints require that the statically known types of the actual arguments are acceptable given the declared formal argument types We discuss the meaning of acceptable below Given these initial constraints, one may derive a set of supertype and/or equality constraints on the formal type parameters of the method or constructor Next, one must try and nd a solution that satis es the constraints on the type parameters As a rst approximation, if a type parameter is constrained by an equality constraint, then that constraint gives its solution Bear in mind that the constraint may equate one type parameter with another, and only when the entire set of constraints on all type variables is resolved will we have a solution A supertype constraint T :> X implies that the solution is one of supertypes of X Given several such constraints on T, we can intersect the sets of supertypes implied by each of the constraints, since the type parameter must be a member of all of them We can then choose the most speci c type that is in the intersection Computing the intersection is more complicated than one might rst realize Given that a type parameter is constrained to be a supertype of two distinct invocations of a generic type, say List<Object> and List<String>, the naive intersection operation might yield Object However, a more sophisticated analysis yields a set containing List< > Similarly, if a type parameter, T, is constrained to be a supertype of two unrelated interfaces I and J, we might infer T must be Object, or we might obtain a tighter bound of I & J These issues are discussed in more detail later in this section

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15122 Compile-Time Step 2: Determine Method Signature

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EXPRESSIONS

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Inference begins with a set of initial constraints of the form A << F, A = F, or A >> F, where U << V indicates that type U is convertible to type V by method invocation conversion ( 53), and U >> V indicates that type V is convertible to type U by method invocation conversion

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These constraints are then reduced to a set of simpler constraints of the forms T :> X, T = X or T <: X, where T is a type parameter of the method This reduction is achieved by the procedure given below:

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