How To Write A Generic Method Inwards Java

Influenza A virus subtype H5N1 method is called generic method if you lot tin operate out whatever type of parameter to it as well as it volition purpose the same e.g. it allows the same logic to endure applied to dissimilar types. It's known every bit a type-safe method every bit well.


1) You tin declare Generic methods non solely on Generic or parameterized flat merely every bit good on regular classes which non generic.

2) The type annunciation similar <T> should come upward subsequently modifiers similar public static merely earlier furnish type similar the void, int, or float. Here is an instance of a generic or parameterized method declaration

public static <T> void swap(T a, T b){

}


3) You tin every bit good work bounds alongside types spell declaring Generic methods e.g. T extends Comparable to access the compareTo() method defined inwards Comparable class. For example, inwards the next method you lot tin solely operate out a List of Comparable, List of whatever flat which doesn't implement Comparable is non acceptable

public static void sort(List<T extends Comparable> aList){

}

alongside honor of this method, next is legal because String implements Comparable
List<String> abcd = Arrays.asList("ab", "bc", "cd");
sort(abcd);

merely next is illegal because PrintStream doesn't implement Comparable
List<PrintStream> destinations = novel ArrayList<>();

That's all nearly how to declare a generic or parameterized method inwards Java. It's i of the of import concepts to sympathise as well as principal because it volition deal you lot to write amend code as well as trim back duplicate as well as boilerplate coding. The fact that you lot tin receive got generic methods on regular classes every bit good deal a lot. This every bit good agency you lot tin include novel parameterized methods inwards your existing utility classes.