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What is a casting expression in Java?
A cast expression provides a mechanism to explicitly provide a lambda expression's type if none can be conveniently inferred from context. It is also useful to resolve ambiguity when a method declaration is overloaded with unrelated functional interface types.
Syntax
Object o = () -> { System.out.println("TutorialsPoint"); }; // Illegal: Object o = (Runnable) () -> { System.out.println("TutorialsPoint"); }; // Legal
Example
interface Algebra1 { int operate(int a, int b); } interface Algebra2 { int operate(int a, int b); } public class LambdaCastingTest { public static void main(String[] args) { printResult((Algebra1)(a, b) -> a + b); // Cast Expression in Lambda printResult((Algebra2)(a, b) -> a * b); // Cast Expression in Lambda } static void printResult(Algebra1 a) { System.out.println("From Algebra1 Interface: " + a.operate(40, 20)); } static void printResult(Algebra2 a) { System.out.println("From Algebra2 Interface: " + a.operate(40, 20)); } }
Output
From Algebra1 Interface: 60 From Algebra2 Interface: 800
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