test/langtools/tools/javac/generics/diamond/neg/Neg13.java

/*
 * @test /nodynamiccopyright/
 * @bug 8062373
 *
 * @summary  Test diamond + anonymous classes with abstract super type
 * @author sadayapalam
 * @compile/fail/ref=Neg13.out Neg13.java -XDrawDiagnostics
 *
 */
class Neg13 {

    static abstract class A<T> {
        abstract void foo();
    }

    static void foo(A<String> as) {}

    public static void main(String[] args) {

        // Method invocation context - good <>(){}
        foo(new A<>() {
            public void foo() {}
        });

        // Assignment context - good <>(){}
        A<?> aq = new A<>() {
            public void foo() {}
        };

        // When the anonymous type subtypes an abstract class but is missing definitions for
        // abstract methods, expect no overload resolution error, but an attribution error
        // while attributing anonymous class body.


        // Method invocation context - bad <>(){}
        foo(new A<>() {
        });

        // Assignment invocation context - bad <>(){}
        aq = new A<>() {
        };

        // Method invocation context - bad <>()
        foo(new A<>());

        // Assignment invocation context - bad <>()
        aq = new A<>();
    }
}