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import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Vector;
import org.checkerframework.checker.interning.qual.Interned;
public class Generics {
void testGenerics() {
Map<String, @Interned String> map = null;
map = new HashMap<>();
String a = new String("foo");
@Interned String b = "bar";
String notInterned;
@Interned String interned;
map.put(a, b); // valid
// :: error: (argument.type.incompatible)
map.put(b, a); // error
notInterned = map.get(a); // valid
interned = map.get(b); // valid
Collection<@Interned String> internedSet;
Collection<String> notInternedSet;
notInternedSet = map.keySet(); // valid
// :: error: (assignment.type.incompatible)
internedSet = map.keySet(); // error
// :: error: (assignment.type.incompatible)
notInternedSet = map.values(); // error
internedSet = map.values(); // valid
HashMap<@Interned String, Vector<@Interned Integer>> all_nums = new HashMap<>();
Vector<@Interned Integer> v = all_nums.get("Hello");
}
// The cells aren't interned, but their contents are
class CellOfImm<T extends @Interned Object> {
T value;
boolean equals(CellOfImm<T> other) {
return value == other.value; // valid
}
}
List<@Interned String> istrings = new ArrayList<>();
List<String> strings = new ArrayList<>();
@Interned String istring = "interned";
String string = new String("uninterned");
void testGenerics2() {
istrings.add(istring);
// :: error: (argument.type.incompatible)
istrings.add(string); // invalid
strings.add(istring);
strings.add(string);
istring = istrings.get(0);
string = istrings.get(0);
// :: error: (assignment.type.incompatible)
istring = strings.get(0); // invalid
string = strings.get(0);
}
void testCollections() {
Collection<String> strings = Collections.unmodifiableCollection(new ArrayList<String>());
Collection<@Interned String> istrings =
Collections.unmodifiableCollection(new ArrayList<@Interned String>()); // valid
}
class MyList extends ArrayList<@Interned String> {
// Correct return value is Iterator<@Interned String>
// :: error: (override.return.invalid)
public Iterator<String> iterator() {
return null;
}
}
// from VarInfoAux
static class VIA {
private static VIA theDefault = new VIA();
private Map<@Interned String, @Interned String> map;
void testMap() {
Map<@Interned String, @Interned String> mymap;
mymap = theDefault.map;
mymap = new HashMap<@Interned String, @Interned String>(theDefault.map);
mymap = new HashMap<>(theDefault.map);
}
}
// type inference
<T> T id(T m, Object t) {
return m;
}
void useID() {
String o = id("m", null);
}
// raw types again
void testRawTypes() {
ArrayList lst = null;
Collections.sort(lst);
}
public static class Pair<T1, T2> {
public T1 a;
public T2 b;
public Pair(T1 a, T2 b) {
this.a = a;
this.b = b;
}
/** Factory method with short name and no need to name type parameters. */
public static <A, B> Pair<A, B> of(A a, B b) {
return new Pair<>(a, b);
}
}
static class C<T> {
T next1;
// @skip-test
// This test might be faulty
// private Pair<T,T> return1() {
// Pair<T,T> result = Pair.of(next1, (T)null);
// return result;
// }
}
}
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