[clsTypeByString] get class object from a string (#13233)

core-java-modules/core-java-reflection/src/main/java/com/baeldung/getclassfromstr/MyNiceClass.java

@@ -0,0 +1,7 @@
+package com.baeldung.getclassfromstr;
+
+public class MyNiceClass {
+    public String greeting(){
+        return "Hi there, I wish you all the best!";
+    }
+}

core-java-modules/core-java-reflection/src/test/java/com/baeldung/getclassfromstr/GetClassObjectFromStringUnitTest.java

@@ -0,0 +1,22 @@
+package com.baeldung.getclassfromstr;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+public class GetClassObjectFromStringUnitTest {
+    @Test
+    void givenQualifiedClsName_whenUsingClassForName_shouldGetExpectedClassObject() throws ReflectiveOperationException {
+        Class cls = Class.forName("com.baeldung.getclassfromstr.MyNiceClass");
+        assertNotNull(cls);
+
+        MyNiceClass myNiceObject = (MyNiceClass) cls.getDeclaredConstructor().newInstance();
+        assertNotNull(myNiceObject);
+        assertEquals("Hi there, I wish you all the best!", myNiceObject.greeting());
+    }
+
+    @Test
+    void givenSimpleName_whenUsingClassForName_shouldGetExpectedException() {
+        assertThrows(ClassNotFoundException.class, () -> Class.forName("MyNiceClass"));
+    }
+}