Add Spring StringUtils class (#15090)

* Add Spring StringUtils class

* Add Spring StringUtils class

core-java-modules/core-java-string-operations-2/pom.xml

@@ -54,6 +54,11 @@
             <artifactId>commons-codec</artifactId>
             <version>${commons-codec.version}</version>
         </dependency>
+        <dependency> 
+            <groupId>org.springframework</groupId> 
+            <artifactId>spring-core</artifactId> 
+            <version>${spring-core.version}</version> 
+        </dependency>
     </dependencies>
 
     <build>
@@ -95,6 +100,7 @@
         <javax.el-api.version>3.0.0</javax.el-api.version>
         <javax.el.version>2.2.6</javax.el.version>
         <commons-codec.version>1.14</commons-codec.version>
+        <spring-core.version>5.3.0</spring-core.version>
     </properties>
 
 </project>

core-java-modules/core-java-string-operations-2/src/test/java/com/baeldung/emptystrings/EmptyStringsUnitTest.java

@@ -3,6 +3,7 @@ package com.baeldung.emptystrings;
 import com.google.common.base.Strings;
 import org.apache.commons.lang3.StringUtils;
 import org.junit.Test;
+import org.springframework.util.ObjectUtils;
 
 import javax.validation.ConstraintViolation;
 import javax.validation.Validation;
@@ -109,6 +110,24 @@ public class EmptyStringsUnitTest {
         assertFalse(Strings.isNullOrEmpty(blankString));
     }
 
+    /*
+     * Spring Core ObjectUtils
+     */
+    @Test
+    public void givenSomeEmptyString_thenObjectUtilsIsEmptyReturnsTrue() {
+        assertTrue(ObjectUtils.isEmpty(emptyString));
+    }
+
+    @Test
+    public void givenSomeNonEmptyString_thenObjectUtilsIsEmptyReturnsFalse() {
+        assertFalse(ObjectUtils.isEmpty(nonEmptyString));
+    }
+
+    @Test
+    public void givenSomeBlankString_thenObjectUtilsIsEmptyReturnsFalse() {
+        assertFalse(ObjectUtils.isEmpty(blankString));
+    }
+
     /*
      * Bean Validation
      */