first change'

src/Main.java

+
+import com.itextpdf.text.pdf.PdfReader;
+
+public class Main {
+    public static void main(String[] args) {
+
+        try {
+            PdfReader pdfReader = new PdfReader("test.pdf");
+            System.out.println(""+pdfReader.getNumberOfPages());
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+
+    }
+}
\ No newline at end of file