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import org.checkerframework.checker.nullness.qual.*;
import org.checkerframework.dataflow.qual.*;
class AnnotatedGenerics {
public static void testNullableTypeVariable() {
// :: error: (initialization.fields.uninitialized)
class Test<T extends @Nullable Object> {
T f;
@Nullable T get() {
return f;
}
}
Test<Iterable<String>> l = new Test<>();
// :: error: (iterating.over.nullable)
for (String s : l.get()) ;
}
public static void testNonNullTypeVariable() {
class Test<T extends @Nullable Object> {
@NonNull T get() {
throw new RuntimeException();
}
}
Test<@Nullable Iterable<String>> l = new Test<>();
for (String s : l.get()) ;
Test<Iterable<String>> n = new Test<>();
for (String s : n.get()) ;
}
static class MyClass<T> implements MyIterator<@Nullable T> {
public boolean hasNext() {
return true;
}
public @Nullable T next() {
return null;
}
public void remove() {}
static void test() {
MyClass<String> c = new MyClass<>();
String c1 = c.next();
@Nullable String c2 = c.next();
// :: error: (assignment.type.incompatible)
@NonNull String c3 = c.next();
}
}
public static final class MyComprator<T extends MyComparable<T>> {
public void compare(T a1, T a2) {
a1.compareTo(a2);
}
public void compare2(@NonNull T a1, @NonNull T a2) {
a1.compareTo(a2);
}
public void compare3(T a1, @Nullable T a2) {
// :: error: (argument.type.incompatible)
a1.compareTo(a2);
}
}
class MyComparable<T> {
@Pure
public int compareTo(@NonNull T a1) {
return 0;
}
}
<T> T test(java.util.List<? super Iterable<?>> l) {
test(new java.util.ArrayList<Object>());
throw new Error();
}
public interface MyIterator<E extends @Nullable Object> {
boolean hasNext();
E next();
void remove();
}
}
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