undefect. CWE-407 — 63 sites patched across 27 ecosystems

Authors: russell@unturf.com · brackishbert@gmail.com · foxhop.net · TimeHexOn.com

Patches, unit tests, benchmarks, whitepaper, and outreach briefs.
Public domain — no copyright claimed. Use freely.

test/langtools/tools/javac/generics/SelfImplement.java

@@ -0,0 +1,19 @@
+/*
+ * @test /nodynamiccopyright/
+ * @bug 4725668
+ * @summary generics: reject implementation with incorrect return type
+ * @author gafter
+ *
+ * @compile/fail/ref=SelfImplement.out -XDrawDiagnostics   SelfImplement.java
+ */
+
+class SelfImplement {
+    static abstract class A<T> {
+        abstract void f(T t);
+        public int f(Integer t) { return 3; }
+    }
+    static abstract class B extends A<Integer> {
+        // error: A<Integer>.f(Integer) returning int can't implement
+        //        A<Integer>.f(Integer) returning void.
+    }
+}