package com.xiuye.lambda;
@FunctionalInterface
interface Fn1 {
default void f() {
System.out.println("Fn1 f");
}
void g();
}
@FunctionalInterface
interface Fn2 {
void h();
}
@FunctionalInterface
interface Fn3 {
boolean staticFn();
}
public class AmbiguousLambda {
static void f(Fn1 f1) {
f1.f();
f1.g();
}
static void f(Fn2 f2) {
f2.h();
}
static boolean checkReturn(Fn3 f3){
return f3.staticFn();
}
public static void main(String[] args) {
/**
* Ambiguous !!!!!
* Exception in thread "main" java.lang.Error: Unresolved compilation
* problem: The method f(Fn1) is ambiguous for the type AmbiguousLambda
*/
// AmbiguousLambda.f(() -> System.out.println("Who called!"));
//Solve it
Fn1 f1 = ()->System.out.println("Fn1 called!");
Fn2 f2 = ()->System.out.println("Fn2 called!");
AmbiguousLambda.f(f1);
AmbiguousLambda.f(f2);
System.out.println("static return := "+checkReturn(AmbiguousLambda::retBoolean));
}
static boolean retBoolean(){
return true;
}
}
Fn1 f
Fn1 called!
Fn2 called!
static return := true
