guava functional work

guava/src/test/java/org/baeldung/guava/GuavaFunctionalExamplesTest.java

@@ -0,0 +1,36 @@
+package org.baeldung.guava;
+
+import static org.hamcrest.Matchers.lessThan;
+import static org.junit.Assert.assertThat;
+
+import java.util.Collections;
+import java.util.List;
+
+import org.junit.Test;
+
+import com.google.common.base.Predicate;
+import com.google.common.collect.Collections2;
+import com.google.common.collect.Lists;
+
+public class GuavaFunctionalExamplesTest {
+
+    // tests
+
+    // predicates
+
+    @Test
+    public final void whenFilteringStringsAccordingToACondition_thenCorrectResults() {
+        final List<Integer> randomNumbers = Lists.newArrayList(1, 2, 3, 6, 8, 10, 34, 57, 89);
+        final Predicate<Integer> acceptEvenNumber = new Predicate<Integer>() {
+            @Override
+            public final boolean apply(final Integer number) {
+                return (number % 2) == 0;
+            }
+        };
+        final List<Integer> evenNumbers = Lists.newArrayList(Collections2.filter(randomNumbers, acceptEvenNumber));
+
+        final Integer found = Collections.binarySearch(evenNumbers, 57);
+        assertThat(found, lessThan(0));
+    }
+
+}