Merge pull request #13475 from StefSC/BAEL-5788-Private-Constructor

[BAEL-5788] Accessing Private Constructor

core-java-modules/core-java-lang-oop-constructors/src/main/java/com/baeldung/reflection/PrivateConstructorClass.java

@@ -0,0 +1,8 @@
+package com.baeldung.reflection;
+
+public class PrivateConstructorClass {
+
+    private PrivateConstructorClass() {
+        System.out.println("Used the private constructor!");
+    }
+}

core-java-modules/core-java-lang-oop-constructors/src/test/java/com/baeldung/reflection/PrivateConstructorUnitTest.java

@@ -0,0 +1,17 @@
+package com.baeldung.reflection;
+
+import java.lang.reflect.Constructor;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+public class PrivateConstructorUnitTest {
+
+    @Test
+    public void whenConstructorIsPrivate_thenInstanceSuccess() throws Exception {
+        Constructor<PrivateConstructorClass> pcc = PrivateConstructorClass.class.getDeclaredConstructor();
+        pcc.setAccessible(true);
+        PrivateConstructorClass privateConstructorInstance = pcc.newInstance();
+        Assertions.assertTrue(privateConstructorInstance instanceof PrivateConstructorClass);
+    }
+}