This commit is related to BAEL-7028 (#15648)

This commit aims to add two classes:
       -  PrintMessageWithoutMainMethod
       - PrintMessageWithoutMainUnitTest

core-java-modules/core-java-console/src/main/java/com/baeldung/printmessagewithoutmain/PrintMessageWithoutMainMethod.java

@@ -0,0 +1,33 @@
+package com.baeldung.printmessagewithoutmain;
+
+public final class PrintMessageWithoutMainMethod {
+
+    //Using Static Blocks
+    static {
+        System.out.println("Hello World!!");
+        System.exit(0);
+    }
+
+    //Using Nested Classes
+    static {
+        NestedClass.printMessage();
+    }
+
+    //Executing Code During Class Initialization
+    private static final int STATUS = getStatus();
+    private static int getStatus() {
+        System.out.println("Hello World!!");
+        System.exit(0);
+        return 0;
+    }
+
+    public static void main(String[] args) {
+
+    }
+
+    static class NestedClass {
+        static void printMessage() {
+            System.out.println("Message from nested class");
+        }
+    }
+}

core-java-modules/core-java-console/src/test/java/com/baeldung/printmessagewithoutmain/PrintMessageWithoutMainUnitTest.java

@@ -0,0 +1,10 @@
+package com.baeldung.printmessagewithoutmain;
+
+import org.junit.jupiter.api.Test;
+
+public class PrintMessageWithoutMainUnitTest {
+    @Test
+    public void givenMessage_whenUsingJunitTest_thenPrintMessage() {
+        System.out.println("Hello World!!");
+    }
+}