--- jsr166/src/test/tck/JSR166TestCase.java	2019/01/10 04:35:16	1.252
+++ jsr166/src/test/tck/JSR166TestCase.java	2019/02/22 19:27:47	1.253
@@ -1750,12 +1750,11 @@ public class JSR166TestCase extends Test
         }
     }
 
-    void assertImmutable(final Object o) {
+    void assertImmutable(Object o) {
         if (o instanceof Collection) {
             assertThrows(
                 UnsupportedOperationException.class,
-                new Runnable() { public void run() {
-                        ((Collection) o).add(null);}});
+                () -> ((Collection) o).add(null));
         }
     }
 
@@ -1815,8 +1814,8 @@ public class JSR166TestCase extends Test
     }
 
     public void assertThrows(Class<? extends Throwable> expectedExceptionClass,
-                             Runnable... throwingActions) {
-        for (Runnable throwingAction : throwingActions) {
+                             Action... throwingActions) {
+        for (Action throwingAction : throwingActions) {
             boolean threw = false;
             try { throwingAction.run(); }
             catch (Throwable t) {