Compile-Time Step 2: Determine Method Signature in Java

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15122 Compile-Time Step 2: Determine Method Signature
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The possibility of an in nite type stems from the recursive calls to lub() Readers familiar with recursive types should note that an in nite type is not the same as a recursive type
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If any of the method s type arguments were not inferred from the types of the actual arguments, they are now inferred as follows If the method result occurs in a context where it will be subject to assignment conversion ( 52) to a type S, then let R be the declared result type of the method, and let R = R[T1 = B(T1) Tn = B(Tn)] where B(Ti) is the type inferred for Ti in the previous section, or Ti if no type was inferred Then, a set of initial constraints consisting of: the constraint S >> R , provided R is not void; and additional constraints Bi[T1 = B(T1) Tn = B(Tn)] >> Ti, where Bi is the declared bound of Ti,
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is created and used to infer constraints on the type arguments using the algorithm of section ( 151227) Any equality constraints are resolved, and then, for each remaining constraint of the form Ti <: Uk, the argument Ti is inferred to be glb(U1, , Uk) ( 5110) Any remaining type variables that have not yet been inferred are then inferred to have type Object Otherwise, the unresolved type arguments are inferred by invoking the procedure described in this section under the assumption that the method result was assigned to a variable of type Object 151229 Examples In the example program:
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public class Doubler { static int two() { return two(1); } private static int two(int i) { return 2*i; } } class Test extends Doubler {
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151228 Inferring Unresolved Type Arguments
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Compile-Time Step 2: Determine Method Signature 15122
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public static long two(long j) {return j+j; } public static void main(String[] args) { Systemoutprintln(two(3)); Systemoutprintln(Doublertwo(3)); // compile-time error } }
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Here, a compile-time error occurs for the second invocation of setColor, because no applicable method can be found at compile time The type of the literal 37 is int, and int cannot be converted to byte by method invocation conversion Assignment conversion, which is used in the initialization of the variable color, performs an implicit conversion of the constant from type int to byte, which is permitted because the value 37 is small enough to be represented in type byte; but such a conversion is not allowed for method invocation conversion If the method setColor had, however, been declared to take an int instead of a byte, then both method invocations would be correct; the rst invocation would be allowed because method invocation conversion does permit a widening conversion from byte to int However, a narrowing cast would then be required in the body of setColor:
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void setColor(int color) { thiscolor = (byte)color; }
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class ColoredPoint { int x, y; byte color; void setColor(byte color) { thiscolor = color; } } class Test { public static void main(String[] args) { ColoredPoint cp = new ColoredPoint(); byte color = 37; cpsetColor(color); cpsetColor(37); // compile-time error } }
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for the method invocation two(1) within class Doubler, there are two accessible methods named two, but only the second one is applicable, and so that is the one invoked at run time For the method invocation two(3) within class Test, there are two applicable methods, but only the one in class Test is accessible, and so that is the one to be invoked at run time (the argument 3 is converted to type long) For the method invocation Doublertwo(3), the class Doubler, not class Test, is searched for methods named two; the only applicable method is not accessible, and so this method invocation causes a compile-time error Another example is:
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