Support Collection.removeIf (#474)

classlib/src/main/java/org/teavm/classlib/java/util/TCollection.java

@@ -16,6 +16,7 @@
 package org.teavm.classlib.java.util;
 
 import java.util.Spliterator;
+import java.util.function.Predicate;
 import org.teavm.classlib.java.lang.TIterable;
 import org.teavm.classlib.java.util.stream.TStream;
 import org.teavm.classlib.java.util.stream.impl.TSpliteratorOverCollection;
@@ -55,4 +56,21 @@ public interface TCollection<E> extends TIterable<E> {
     default TStream<E> stream() {
         return new TStreamOverSpliterator<>((Spliterator<E>) spliterator());
     }
+
+    default boolean removeIf(Predicate<? super E> filter) {
+        TIterator<E> iterator = iterator();
+        boolean removed = false;
+
+        while (iterator.hasNext()) {
+            E element = iterator.next();
+            boolean match = filter.test(element);
+
+            if (match) {
+                iterator.remove();
+                removed = true;
+            }
+        }
+
+        return removed;
+    }
 }

tests/src/test/java/org/teavm/classlib/java/util/ArrayListTest.java

@@ -159,4 +159,19 @@ public class ArrayListTest {
             // OK
         }
     }
+
+    @Test
+    public void removeIf() {
+        List<String> list = new ArrayList<>();
+        list.add("A1");
+        list.add("A2");
+        list.add("B1");
+        list.add("B2");
+
+        list.removeIf(e -> e.endsWith("2"));
+
+        assertEquals(2, list.size());
+        assertEquals("A1", list.get(0));
+        assertEquals("B1", list.get(1));
+    }
 }