BAEL-9449 CollectionUtils.exists (#18810)

* Update FindACustomerInGivenList.java

* Update FindACustomerInGivenListUnitTest.java

* Update FindACustomerInGivenList.java

Author: Deepak-Vohra

core-java-modules/core-java-collections-list/src/main/java/com/baeldung/findanelement/FindACustomerInGivenList.java

@@ -4,7 +4,7 @@
 import java.util.List;
 
 import org.apache.commons.collections4.IterableUtils;
-
+import org.apache.commons.collections4.CollectionUtils;
 import com.google.common.base.Predicate;
 import com.google.common.collect.Iterables;
 
@@ -74,4 +74,11 @@ public boolean evaluate(Customer customer) {
         });
     }
 
-}
+    public boolean findUsingExists(String name, List<Customer> customers) {
+        return CollectionUtils.exists(customers, new org.apache.commons.collections4.Predicate<Customer>() {
+            public boolean evaluate(Customer customer) {
+                return customer.getName().equals(name);
+            }
+        });
+    }
+}

core-java-modules/core-java-collections-list/src/test/java/com/baeldung/findanelement/FindACustomerInGivenListUnitTest.java

@@ -1,7 +1,10 @@
 package com.baeldung.findanelement;
 
-import static org.junit.Assert.*;
-
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNull;
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertTrue;
+import static org.junit.Assert.assertFalse;
 import java.util.ArrayList;
 import java.util.List;
 
@@ -155,4 +158,16 @@ public void givenName_whenCustomerWithNameNotFoundUsingGuava_thenReturnNull() {
         assertNull(john);
     }
 
+    @Test
+    public void givenName_whenCustomerWithNameFoundUsingExists_thenReturnTrue() {
+        boolean isJamesPresent = findACustomerInGivenList.findUsingExists("James", customers);
+        assertTrue(isJamesPresent);
+    }
+
+    @Test
+    public void givenName_whenCustomerWithNameNotFoundUsingExists_thenReturnFalse() {
+        boolean isJohnPresent = findACustomerInGivenList.findUsingExists("John", customers);
+        assertFalse(isJohnPresent);
+    }
+
 }