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What is the generic functional interface in Java?
A lambda expression can't specify type parameters, so it's not generic. However, a functional interface associated with lambda expression is generic. In this case, the target type of lambda expression has determined by the type of argument(s) specified when a functional interface reference is declared.
Syntax
interface SomeFunc {
T func(T t);
}Example
interface MyGeneric<T> {
T compute(T t);
}
public class LambdaGenericFuncInterfaceTest {
public static void main(String args[]) {
MyGeneric<String> reverse = (str) -> { // Lambda Expression
String result = "";
for(int i = str.length()-1; i >= 0; i--)
result += str.charAt(i);
return result;
};
MyGeneric<Integer> factorial = (Integer n) -> { // Lambda Expression
int result = 1;
for(int i=1; i <= n; i++)
result = i * result;
return result;
};
System.out.println(reverse.compute("Lambda Generic Functional Interface"));
System.out.println(factorial.compute(7));
}
}Output
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Updated on: 11-Jul-2020
2K+ Views
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