diff --git a/core-java/src/main/java/com/baeldung/polymorphism/GenericFile.java b/core-java/src/main/java/com/baeldung/polymorphism/GenericFile.java
index 4075083c49..03e704f36f 100644
--- a/core-java/src/main/java/com/baeldung/polymorphism/GenericFile.java
+++ b/core-java/src/main/java/com/baeldung/polymorphism/GenericFile.java
@@ -54,7 +54,7 @@ public class GenericFile {
     }
 
     public String getFileInfo() {
-        return "File Name: " + this.getName() + "\n" + "Extension: " + this.getExtension() + "\n" + "Date Created: " + this.getDateCreated() + "\n" + "Version: " + this.getVersion() + "\n";
+        return String.format("File Name: %s\n" + " Extension: %s\n" + " Date Created: %s\n" + " Version: %s\n", this.getName(), this.getExtension(), this.getDateCreated(), this.getVersion());
     }
 
     public Object read() {
diff --git a/core-java/src/main/java/com/baeldung/polymorphism/ImageFile.java b/core-java/src/main/java/com/baeldung/polymorphism/ImageFile.java
index ac72a40993..e237f3f826 100644
--- a/core-java/src/main/java/com/baeldung/polymorphism/ImageFile.java
+++ b/core-java/src/main/java/com/baeldung/polymorphism/ImageFile.java
@@ -30,7 +30,7 @@ public class ImageFile extends GenericFile {
     }
 
     public String getFileInfo() {
-        return super.getFileInfo() + "Height: " + this.getHeight() + "\n" + "Width: " + this.getWidth();
+        return String.format(" %s Height: %d\n Width: %d", super.getFileInfo(), this.getHeight(), this.getWidth());
     }
 
     public String read() {
diff --git a/core-java/src/main/java/com/baeldung/polymorphism/TextFile.java b/core-java/src/main/java/com/baeldung/polymorphism/TextFile.java
index 8280b4ee95..2c28c968b8 100644
--- a/core-java/src/main/java/com/baeldung/polymorphism/TextFile.java
+++ b/core-java/src/main/java/com/baeldung/polymorphism/TextFile.java
@@ -21,7 +21,7 @@ public class TextFile extends GenericFile {
     }
 
     public String getFileInfo() {
-        return super.getFileInfo() + "Word Count: " + wordCount;
+        return String.format(" %s Word Count: %d", super.getFileInfo(), wordCount);
     }
 
     public String read() {
diff --git a/core-java/src/test/java/com/baeldung/polymorphism/PolymorphismUnitTest.java b/core-java/src/test/java/com/baeldung/polymorphism/PolymorphismUnitTest.java
index 8fb606c2fc..58826766e0 100644
--- a/core-java/src/test/java/com/baeldung/polymorphism/PolymorphismUnitTest.java
+++ b/core-java/src/test/java/com/baeldung/polymorphism/PolymorphismUnitTest.java
@@ -3,8 +3,6 @@ package com.baeldung.polymorphism;
 import static org.junit.Assert.*;
 
 import java.awt.image.BufferedImage;
-
-import org.junit.Ignore;
 import org.junit.Test;
 
 public class PolymorphismUnitTest {