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THE JAVA COLLECTIONS FRAMEWORK
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The variable E used in lines 1 6 of Example 4.2 is called a type parameter. Like a method parameter, it stands for a type that can be substituted for it. The actual type that is substituted for the type parameter is called a type argument. For example:
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Queue<String> stringQueue = new Queue<String>();
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Here, the collection stringQueue is instantiated by substituting the type argument String for the type parameter E. EXAMPLE 4.3 Using Type Arguments
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This program uses two special user-defined types at line 3: an enum Month type defined at line 11 and a generic Pair type defined at lines 13 32:
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33
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public class TestPairClass { public static void main(String[] args) { Pair<Month, Integer> christmas = new Pair<Month,Integer>(Month.DEC, 25); System.out.println(christmas); Month month = christmas.getFirst(); int day = christmas.getSecond(); System.out.printf("%d %s%n", day, month); } } enum Month { JAN, FEB, MAR, APR, MAY, JUN, JUL, AUG, SEP, OCT, NOV, DEC } class Pair<S, T> { private S first; private T second; public Pair(S first, T second) { this.first = first; this.second = second; } public S getFirst() { return first; } public T getSecond() { return second; } public String toString() { return "(" + first + ", " + second + ")"; } }
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The output is:
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(DEC, 25) 25 DEC
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The generic class is defined at line 13. It has two type parameters: S and T. In the code at lines 14, 15, 17, 22, and 26, these two type parameters are used as place holders for actual types. Note that the <S,T> expression is not used in the constructor definition at line 18. But the <> construct is required when the constructor is invoked, as at line 3.
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THE JAVA COLLECTIONS FRAMEWORK
[CHAP. 4
If you compile a program using nongeneric JCF classes (i.e., without specifying a type arguments for the element type) you re likely to get a compiler message like this:
uses unchecked or unsafe operations. Note: Recompile with -Xlint:unchecked for details. You can avoid that simply by specifying an element type; even Object itself, like this: List<Object> list = new ArrayList<Object>();
GENERIC METHODS In addition to generic types, type parameters can also be used to define generic methods, identified by the generic parameter specifier <T> placed in front of the return type. EXAMPLE 4.4 A Generic Method
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public class TestPrint { public static void main(String[] args) { args = new String[]{"CA", "US", "MX", "HN", "GT"}; print(args); } static <E> void print(E[] a) { for (E ae : a) { System.out.printf("%s ", ae); } System.out.println(); } }
The output is:
CA US MX HN GT
The method is identified as generic by the <E> specifier at line 7. This allows the type parameter E to be used in place of an actual type in the method block at line 8.
GENERIC WILDCARDS The symbol can be used as a wildcard, in place of a generic variable. It stands for unknown type, and is called the wildcard type. EXAMPLE 4.5 A Universal print() Method
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static void print(Collection< > c) { for (Object o : c) { System.out.printf("%s ", o); } System.out.println(); }
This method can be used to print any type of collection, for example, a HashSet<String> or a
Queue<Date>.
Note that if we used Collection<Object> instead of Collection< > at line 1, then the method would only apply to collections whose element type is specified as Object. For example, it could not be used to print a HashSet<String> because that is not an extension of Collection<Object>.
CHAP. 4]
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