prefer extensions methods als interface (IDEA-96719)

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/advHighlighting7/DefaultMethodVisibility.java

@@ -0,0 +1,14 @@
+interface OfInt extends Sink<Integer> {
+  default void accept(Integer i) {}
+}
+interface Sink<T> extends Block<T> {
+}
+
+interface Block<T> {
+  public void accept(T t);
+}
+
+
+class Hello1 implements Sink<Integer>, OfInt {}
+class Hello2 implements OfInt, Sink<Integer>{}
+