Добавил примеры для дебага

src/main/java/dev/struchkov/example/debugger/four/ExampleFour.java

@@ -3,16 +3,11 @@ package dev.struchkov.example.debugger.four;
 public class ExampleFour {
 
     public static void main(String[] args) {
-        final ThirdService thirdService = new ThirdService();
-        final SecondService secondService = new SecondService(thirdService);
-        final FirstService firstService = new FirstService(secondService);
+        final ThreadExample one = new ThreadExample("Первый");
+        final ThreadExample two = new ThreadExample("Второй");
 
-        final Entity entity = new Entity("Dasha");
-        firstService.processing(entity);
-
-        System.out.println();
-        System.out.println(entity);
-        System.out.println();
+        new Thread(one).start();
+        new Thread(two).start();
     }
 
 }

src/main/java/dev/struchkov/example/debugger/four/ThreadExample.java

@@ -1,4 +1,4 @@
-package dev.struchkov.example.debugger.three;
+package dev.struchkov.example.debugger.four;
 
 public class ThreadExample implements Runnable {
 

src/main/java/dev/struchkov/example/debugger/one/ExampleOne.java

@@ -5,8 +5,8 @@ public class ExampleOne {
     public static void main(String[] args) {
         final PersonService personService = new PersonService();
 
-        demoOne(personService);
-//        demoTwo(personService);
+//        demoOne(personService);
+        demoTwo(personService);
     }
 
     private static void demoOne(PersonService personService) {
@@ -15,6 +15,10 @@ public class ExampleOne {
         personService.showAllPerson();
     }
 
+    private static String getIvanovName() {
+        return "Иванов";
+    }
+
     private static void demoTwo(PersonService personService) {
         personService.showAllPerson();
         personService.correctDeleteAllByLastName("Скворцова");

src/main/java/dev/struchkov/example/debugger/three/Entity.java

@@ -1,4 +1,4 @@
-package dev.struchkov.example.debugger.four;
+package dev.struchkov.example.debugger.three;
 
 public class Entity {
 

src/main/java/dev/struchkov/example/debugger/three/ExampleThree.java

@@ -0,0 +1,18 @@
+package dev.struchkov.example.debugger.three;
+
+public class ExampleThree {
+
+    public static void main(String[] args) {
+        final ThirdService thirdService = new ThirdService();
+        final SecondService secondService = new SecondService(thirdService);
+        final FirstService firstService = new FirstService(secondService);
+
+        final Entity entity = new Entity("Dasha");
+        firstService.processing(entity);
+
+        System.out.println();
+        System.out.println(entity);
+        System.out.println();
+    }
+
+}

src/main/java/dev/struchkov/example/debugger/three/FirstService.java

@@ -1,4 +1,4 @@
-package dev.struchkov.example.debugger.four;
+package dev.struchkov.example.debugger.three;
 
 import dev.struchkov.example.debugger.box.SurpriseException;
 

src/main/java/dev/struchkov/example/debugger/three/SecondService.java

@@ -1,4 +1,4 @@
-package dev.struchkov.example.debugger.four;
+package dev.struchkov.example.debugger.three;
 
 public class SecondService {
 

src/main/java/dev/struchkov/example/debugger/three/ThirdService.java

@@ -1,4 +1,4 @@
-package dev.struchkov.example.debugger.four;
+package dev.struchkov.example.debugger.three;
 
 public class ThirdService {
 

src/main/java/dev/struchkov/example/debugger/three/TreadMain.java

@@ -1,13 +0,0 @@
-package dev.struchkov.example.debugger.three;
-
-public class TreadMain {
-
-    public static void main(String[] args) {
-        final ThreadExample one = new ThreadExample("Первый");
-        final ThreadExample two = new ThreadExample("Второй");
-
-        new Thread(one).start();
-        new Thread(two).start();
-    }
-
-}

src/main/java/dev/struchkov/example/debugger/two/ExampleTwo.java

@@ -0,0 +1,10 @@
+package dev.struchkov.example.debugger.two;
+
+public class ExampleTwo {
+
+    public static void main(String[] args) {
+        final FooService fooService = new FooService();
+        fooService.example();
+    }
+
+}

src/main/java/dev/struchkov/example/debugger/two/FooService.java

@@ -2,7 +2,7 @@ package dev.struchkov.example.debugger.two;
 
 import dev.struchkov.example.debugger.box.SurpriseBox;
 
-public class ForExample {
+public class FooService {
 
     public void example() {
         for (int i = 0; i < 1000; i++) {

src/main/java/dev/struchkov/example/debugger/two/Main.java

@@ -1,10 +0,0 @@
-package dev.struchkov.example.debugger.two;
-
-public class Main {
-
-    public static void main(String[] args) {
-        final ForExample forExample = new ForExample();
-        forExample.example();
-    }
-
-}