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How can we pass lambda expression in a method in Java?
A lambda expression passed in a method that has an argument of type of functional interface. If we need to pass a lambda expression as an argument, the type of parameter receiving the lambda expression argument must be of a functional interface type.
In the below example, the lambda expression can be passed in a method which argument's type is "TestInterface".
Example
interface TestInterface {
boolean test(int a);
}
class Test {
// lambda expression can be passed as first argument in the check() method
static boolean check(TestInterface ti, int b) {
return ti.test(b);
}
}
public class LambdaExpressionPassMethodTest {
public static void main(String arg[]) {
// lambda expression
boolean result = Test.check((x) -> (x%2) == 0, 10);
System.out.println("The result is: "+ result);
}
}Output
The result is: true
Updated on: 10-Jul-2020
2K+ Views
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