Where Types Are Used in Java

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Where Types Are Used
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TYPES, VALUES, AND VARIABLES
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Imported types ( 75); here the type Random, imported from the type javautilRandom of the package javautil, is declared Fields, which are the class variables and instance variables of classes ( 83), and constants of interfaces ( 93); here the eld divisor in the class MiscMath is declared to be of type int Method parameters ( 841); here the parameter l of the method ratio is declared to be of type long
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double
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Constructor parameters ( 881); here the parameter of the constructor for MiscMath is declared to be of type int Local variables ( 144, 1414); the local variables r and val of the method gausser are declared to be of types Random and double[] (array of double)
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Exception handler parameters ( 1420); here the exception handler parameter e of the catch clause is declared to be of type Exception
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and in expressions of the following kinds:
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Class instance creations ( 159); here a local variable r of method gausser is initialized by a class instance creation expression that uses the type Random Generic class ( 812) instance creations ( 159); here Number is used as a type argument in the expression new ArrayList<Number>() Array creations ( 1510); here the local variable val of method gausser is initialized by an array creation expression that creates an array of double with size 2
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Generic method ( 844) or constructor ( 884) invocations ( 1512); here the method loop calls itself with an explicit type argument S Casts ( 1516); here the return statement of the method ratio uses the float type in a cast The instanceof operator ( 15202); here the instanceof operator tests whether e is assignment compatible with the type ArithmeticException
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Types are also used as arguments to parameterized types; here the type Number is used as an argument in the parameterized type Collection<Number>
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Type variables ( 44); here the type variable T has Number as its declared bound
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Method results ( 84); here the result of the method ratio is declared to be of type float, and the result of the method gausser is declared to be of type
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TYPES, VALUES, AND VARIABLES
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Variables of Reference Type
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412 Variables
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A variable is a storage location and has an associated type, sometimes called its compile-time type, that is either a primitive type ( 42) or a reference type ( 43) A variable s value is changed by an assignment ( 1526) or by a pre x or post x ++ (increment) or -- (decrement) operator ( 15142, 15143, 15151, 15152) Compatibility of the value of a variable with its type is guaranteed by the design of the Java programming language, as long as a program does not give rise to unchecked warnings ( 41221) Default values are compatible ( 4125) and all assignments to a variable are checked for assignment compatibility ( 52), usually at compile time, but, in a single case involving arrays, a run-time check is made ( 1010) 4121 Variables of Primitive Type
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A variable of a primitive type always holds a value of that exact primitive type 4122 Variables of Reference Type
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A variable of a class type T can hold a null reference or a reference to an instance of class T or of any class that is a subclass of T A variable of an interface type can hold a null reference or a reference to any instance of any class that implements the interface
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Note that a variable is not guaranteed to always refer to a subtype of its declared type, but only to subclasses or subinterfaces of the declared type This is due to the possibility of heap pollution discussed below
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If T is a primitive type, then a variable of type array of T can hold a null reference or a reference to any array of type array of T ; if T is a reference type, then a variable of type array of T can hold a null reference or a reference to any array of type array of S such that type S is a subclass or subinterface of type T In addition, a variable of type Object[] can hold an array of any reference type