diff --git a/src/examples/src/org/apache/poi/xslf/usermodel/DataExtraction.java b/src/examples/src/org/apache/poi/xslf/usermodel/DataExtraction.java
index aa0ab21ef4..806735c4a8 100644
--- a/src/examples/src/org/apache/poi/xslf/usermodel/DataExtraction.java
+++ b/src/examples/src/org/apache/poi/xslf/usermodel/DataExtraction.java
@@ -32,6 +32,7 @@ import org.apache.poi.openxml4j.opc.PackagePart;
  * Demonstrates how you can extract data from a .pptx file
  */
 public final class DataExtraction {
+    private DataExtraction() {}
 
     public static void main(String[] args) throws IOException, OpenXML4JException {
 
diff --git a/src/examples/src/org/apache/poi/xslf/usermodel/MergePresentations.java b/src/examples/src/org/apache/poi/xslf/usermodel/MergePresentations.java
index 75617f672e..a4c241e30c 100644
--- a/src/examples/src/org/apache/poi/xslf/usermodel/MergePresentations.java
+++ b/src/examples/src/org/apache/poi/xslf/usermodel/MergePresentations.java
@@ -26,6 +26,7 @@ import java.io.FileOutputStream;
  * Merge multiple pptx presentations together
  */
 public final class MergePresentations {
+    private MergePresentations() {}
 
     public static void main(String[] args) throws Exception {
         try (XMLSlideShow ppt = new XMLSlideShow()) {
diff --git a/src/examples/src/org/apache/poi/xslf/usermodel/PieChartDemo.java b/src/examples/src/org/apache/poi/xslf/usermodel/PieChartDemo.java
index 749ed98218..ce920709e6 100644
--- a/src/examples/src/org/apache/poi/xslf/usermodel/PieChartDemo.java
+++ b/src/examples/src/org/apache/poi/xslf/usermodel/PieChartDemo.java
@@ -38,7 +38,9 @@ import org.apache.poi.xddf.usermodel.chart.XDDFPieChartData;
 /**
  * Build a pie chart from a template pptx
  */
-public class PieChartDemo {
+public final class PieChartDemo {
+    private PieChartDemo() {}
+
     private static void usage(){
         System.out.println("Usage: PieChartDemo <pie-chart-template.pptx> <pie-chart-data.txt>");
         System.out.println("    pie-chart-template.pptx     template with a pie chart");
diff --git a/src/examples/src/org/apache/poi/xslf/usermodel/Tutorial1.java b/src/examples/src/org/apache/poi/xslf/usermodel/Tutorial1.java
index 0a8d830bc4..34a33f74e5 100644
--- a/src/examples/src/org/apache/poi/xslf/usermodel/Tutorial1.java
+++ b/src/examples/src/org/apache/poi/xslf/usermodel/Tutorial1.java
@@ -26,7 +26,8 @@ import java.io.IOException;
  * Demonstrates how to create slides with predefined layout
  * and fill the placeholder shapes
  */
-public class Tutorial1 {
+public final class Tutorial1 {
+    private Tutorial1() {}
 
     public static void main(String[] args) throws IOException{
         try (XMLSlideShow ppt = new XMLSlideShow()) {
diff --git a/src/examples/src/org/apache/poi/xslf/usermodel/Tutorial2.java b/src/examples/src/org/apache/poi/xslf/usermodel/Tutorial2.java
index aaf48c3336..b1c1e1eb6c 100644
--- a/src/examples/src/org/apache/poi/xslf/usermodel/Tutorial2.java
+++ b/src/examples/src/org/apache/poi/xslf/usermodel/Tutorial2.java
@@ -27,7 +27,8 @@ import java.io.IOException;
 /**
  * Basic paragraph and text formatting
  */
-public class Tutorial2 {
+public final class Tutorial2 {
+    private Tutorial2() {}
 
     public static void main(String[] args) throws IOException{
         try (XMLSlideShow ppt = new XMLSlideShow()) {
diff --git a/src/examples/src/org/apache/poi/xslf/usermodel/Tutorial3.java b/src/examples/src/org/apache/poi/xslf/usermodel/Tutorial3.java
index 4a81b83b89..15b8660b9b 100644
--- a/src/examples/src/org/apache/poi/xslf/usermodel/Tutorial3.java
+++ b/src/examples/src/org/apache/poi/xslf/usermodel/Tutorial3.java
@@ -28,7 +28,8 @@ import org.apache.poi.sl.usermodel.Placeholder;
 /**
  * How to set slide title
  */
-public class Tutorial3 {
+public final class Tutorial3 {
+    private Tutorial3() {}
 
     public static void main(String[] args) throws IOException{
         try (XMLSlideShow ppt = new XMLSlideShow()) {
diff --git a/src/examples/src/org/apache/poi/xslf/usermodel/Tutorial4.java b/src/examples/src/org/apache/poi/xslf/usermodel/Tutorial4.java
index 19d0cc9859..68648ab823 100644
--- a/src/examples/src/org/apache/poi/xslf/usermodel/Tutorial4.java
+++ b/src/examples/src/org/apache/poi/xslf/usermodel/Tutorial4.java
@@ -30,7 +30,8 @@ import org.apache.poi.sl.usermodel.TextParagraph.TextAlign;
 /**
  * PPTX Tables
  */
-public class Tutorial4 {
+public final class Tutorial4 {
+    private Tutorial4() {}
 
     public static void main(String[] args) throws IOException{
         try (XMLSlideShow ppt = new XMLSlideShow()) {
diff --git a/src/examples/src/org/apache/poi/xslf/usermodel/Tutorial5.java b/src/examples/src/org/apache/poi/xslf/usermodel/Tutorial5.java
index ccd25c53c9..4230cc265d 100644
--- a/src/examples/src/org/apache/poi/xslf/usermodel/Tutorial5.java
+++ b/src/examples/src/org/apache/poi/xslf/usermodel/Tutorial5.java
@@ -28,7 +28,8 @@ import org.apache.poi.sl.usermodel.PictureData.PictureType;
 /**
  * Images
  */
-public class Tutorial5 {
+public final class Tutorial5 {
+    private Tutorial5() {}
 
     public static void main(String[] args) throws IOException{
         try (XMLSlideShow ppt = new XMLSlideShow()) {
diff --git a/src/examples/src/org/apache/poi/xslf/usermodel/Tutorial6.java b/src/examples/src/org/apache/poi/xslf/usermodel/Tutorial6.java
index 6f981018a1..8ddd6ce3fa 100644
--- a/src/examples/src/org/apache/poi/xslf/usermodel/Tutorial6.java
+++ b/src/examples/src/org/apache/poi/xslf/usermodel/Tutorial6.java
@@ -26,7 +26,8 @@ import java.io.IOException;
 /**
  * Hyperlinks
  */
-public class Tutorial6 {
+public final class Tutorial6 {
+    private Tutorial6() {}
 
     public static void main(String[] args) throws IOException{
         try (XMLSlideShow ppt = new XMLSlideShow()) {
diff --git a/src/examples/src/org/apache/poi/xslf/usermodel/Tutorial7.java b/src/examples/src/org/apache/poi/xslf/usermodel/Tutorial7.java
index bc58d82a4e..2fcd9c3250 100644
--- a/src/examples/src/org/apache/poi/xslf/usermodel/Tutorial7.java
+++ b/src/examples/src/org/apache/poi/xslf/usermodel/Tutorial7.java
@@ -29,7 +29,8 @@ import org.apache.poi.sl.usermodel.AutoNumberingScheme;
 /**
  * Bullets and numbering
  */
-public class Tutorial7 {
+public final class Tutorial7 {
+    private Tutorial7() {}
 
     public static void main(String[] args) throws IOException {
         try (XMLSlideShow ppt = new XMLSlideShow()) {
diff --git a/src/examples/src/org/apache/poi/xslf/usermodel/tutorial/Step1.java b/src/examples/src/org/apache/poi/xslf/usermodel/tutorial/Step1.java
index 13fc96ce59..c74046b45d 100644
--- a/src/examples/src/org/apache/poi/xslf/usermodel/tutorial/Step1.java
+++ b/src/examples/src/org/apache/poi/xslf/usermodel/tutorial/Step1.java
@@ -31,7 +31,8 @@ import org.apache.poi.xslf.usermodel.XSLFTextShape;
 /**
  * Reading a .pptx presentation and printing basic shape properties
  */
-public class Step1 {
+public final class Step1 {
+    private Step1() {}
 
     public static void main(String[] args) throws Exception {
         if(args.length == 0)  {
diff --git a/src/examples/src/org/apache/poi/xslf/usermodel/tutorial/Step2.java b/src/examples/src/org/apache/poi/xslf/usermodel/tutorial/Step2.java
index a989ef28cf..03fd4f6abb 100644
--- a/src/examples/src/org/apache/poi/xslf/usermodel/tutorial/Step2.java
+++ b/src/examples/src/org/apache/poi/xslf/usermodel/tutorial/Step2.java
@@ -31,7 +31,9 @@ import java.io.FileOutputStream;
 /**
  * Create slides from pre-defined slide layouts
  */
-public class Step2 {
+public final class Step2 {
+    private Step2() {}
+
     public static void main(String[] args) throws Exception{
         try (XMLSlideShow ppt = new XMLSlideShow()) {
 
diff --git a/src/examples/src/org/apache/poi/xssf/usermodel/examples/BarChart.java b/src/examples/src/org/apache/poi/xssf/usermodel/examples/BarChart.java
index b3bb44b22e..0cd57fc70e 100644
--- a/src/examples/src/org/apache/poi/xssf/usermodel/examples/BarChart.java
+++ b/src/examples/src/org/apache/poi/xssf/usermodel/examples/BarChart.java
@@ -48,7 +48,8 @@ import org.apache.poi.xssf.usermodel.XSSFWorkbook;
 /**
  * Line chart example.
  */
-public class BarChart {
+public final class BarChart {
+    private BarChart() {}
 
     public static void main(String[] args) throws IOException {
         try (XSSFWorkbook wb = new XSSFWorkbook()) {
diff --git a/src/examples/src/org/apache/poi/xssf/usermodel/examples/ExcelChartWithTargetLine.java b/src/examples/src/org/apache/poi/xssf/usermodel/examples/ExcelChartWithTargetLine.java
index 2cdb96b411..c5a4f8dee8 100644
--- a/src/examples/src/org/apache/poi/xssf/usermodel/examples/ExcelChartWithTargetLine.java
+++ b/src/examples/src/org/apache/poi/xssf/usermodel/examples/ExcelChartWithTargetLine.java
@@ -62,7 +62,8 @@ import org.apache.poi.xssf.usermodel.XSSFWorkbook;
  * @see <a href="https://stackoverflow.com/questions/50873700/">Change axis color and font of the chart in openxmlformats</a>
  * @see <a href="https://stackoverflow.com/questions/51530552/">Change colors of line chart Apache POI</a>
  */
-class ExcelChartWithTargetLine {
+public final class ExcelChartWithTargetLine {
+    private ExcelChartWithTargetLine() {}
 
     private static final int NUM_OF_ROWS = 6;
 
diff --git a/src/examples/src/org/apache/poi/xssf/usermodel/examples/LineChart.java b/src/examples/src/org/apache/poi/xssf/usermodel/examples/LineChart.java
index 9d56656795..0141e17573 100644
--- a/src/examples/src/org/apache/poi/xssf/usermodel/examples/LineChart.java
+++ b/src/examples/src/org/apache/poi/xssf/usermodel/examples/LineChart.java
@@ -49,7 +49,8 @@ import org.apache.poi.xssf.usermodel.XSSFWorkbook;
 /**
  * Line chart example.
  */
-public class LineChart {
+public final class LineChart {
+    private LineChart() {}
 
     public static void main(String[] args) throws IOException {
         try (XSSFWorkbook wb = new XSSFWorkbook()) {
diff --git a/src/examples/src/org/apache/poi/xssf/usermodel/examples/ScatterChart.java b/src/examples/src/org/apache/poi/xssf/usermodel/examples/ScatterChart.java
index 2cd818a36b..5e10db8591 100644
--- a/src/examples/src/org/apache/poi/xssf/usermodel/examples/ScatterChart.java
+++ b/src/examples/src/org/apache/poi/xssf/usermodel/examples/ScatterChart.java
@@ -50,7 +50,8 @@ import org.apache.poi.xssf.usermodel.XSSFWorkbook;
 /**
  * Illustrates how to create a simple scatter chart.
  */
-public class ScatterChart {
+public final class ScatterChart {
+    private ScatterChart() {}
 
     public static void main(String[] args) throws IOException {
         try (XSSFWorkbook wb = new XSSFWorkbook()) {
diff --git a/src/examples/src/org/apache/poi/xwpf/usermodel/examples/BarChartExample.java b/src/examples/src/org/apache/poi/xwpf/usermodel/examples/BarChartExample.java
index 567d39a102..2b2d176f12 100644
--- a/src/examples/src/org/apache/poi/xwpf/usermodel/examples/BarChartExample.java
+++ b/src/examples/src/org/apache/poi/xwpf/usermodel/examples/BarChartExample.java
@@ -43,7 +43,9 @@ import org.apache.poi.xwpf.usermodel.XWPFDocument;
 /**
  * Build a bar chart from a template docx
  */
-public class BarChartExample {
+public final class BarChartExample {
+    private BarChartExample() {}
+
     private static void usage(){
         System.out.println("Usage: BarChartExample <bar-chart-template.docx> <bar-chart-data.txt>");
         System.out.println("    bar-chart-template.docx     template with a bar chart");