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class TypeArgsConsistency {
interface I<T> {
T m(int i, int j);
}
static void foo(I<Integer> s) { }
static <X> I<X> bar(I<X> s) { return null; }
{
I<Integer> i1 = (i, j) -> i + j;
foo((i, j) -> i + j);
I<Integer> i2 = bar((i, j) -> i + j);
I<Integer> i3 = bar(<error descr="Incompatible return type String in lambda expression">(i, j) -> "" + i + j</error>);
}
}
class TypeArgsConsistency1 {
interface I<T> {
int m(int i, T j);
}
static void foo(I<Integer> s) { }
static <X> I<X> bar(I<X> s) { return null; }
{
I<Integer> i1 = (i, j) -> i + j;
foo((i, j) -> i + j);
I<Integer> i2 =bar((i, j) -> i) ;
I<Integer> i3 = bar(<error descr="Incompatible return type String in lambda expression">(i, j) -> "" + i + j</error>);
}
}
class TypeArgsConsistency2 {
static <T> I<T> bar(I<T> i) {return null;}
static <T> I1<T> bar1(I1<T> i) {return null;}
static <T> I2<T> bar2(I2<T> i) {return i;}
public static void main(String[] args) {
I<Integer> i1 = bar(x -> x);
I1<Integer> i2 = bar1(x -> 1);
I2<String> aI2 = bar2(x -> "");
I2<Integer> aI28 = bar2( <error descr="Incompatible return type String in lambda expression">x-> ""</error>);
I2<Integer> i3 = bar2(x -> x);
I2<Integer> i4 = bar2(x -> foooI());
System.out.println(i4.foo(2));
}
static <K> K fooo(){return null;}
static int foooI(){return 0;}
interface I<X> {
X foo(X x);
}
interface I1<X> {
int foo(X x);
}
interface I2<X> {
X foo(int x);
}
}
class TypeArgsConsistency3 {
public static void main(String[] args) {
doIt1(1, x -> doIt1(x, y -> x * y));
doIt1(1, x -> x);
doIt1(1, x -> x * x);
}
interface F1<ResultType, P1> { ResultType _(P1 p); }
static <T> T doIt1(T i, F1<T,T> f) { return f._(i);}
}
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