Task 4 completed: Added exception wrapper utility and example

age_output.txt

+Valid age entered: 32
\ No newline at end of file

src/ExceptionClass.java

 // Custom Exception Class
 class InvalidAgeException extends RuntimeException {
-        public InvalidAgeException(String message) {
-            super(message);
-        }
+    public InvalidAgeException(String message) {
+        super(message);
     }
+}
\ No newline at end of file

src/IOExceptionWrapper.java

+import java.io.IOException;
+import java.io.UncheckedIOException;
+import java.util.function.Supplier;
+
+    public class IOExceptionWrapper {
+
+        @FunctionalInterface
+        public interface IOCallable<T> {
+            T call() throws IOException;
+        }
+
+        public static <T> T wrap(IOCallable<T> action) {
+            try {
+                return action.call();
+            } catch (IOException e) {
+                throw new UncheckedIOException(e);
+            }
+        }
+
+        public static void wrapRunnable(IORunnable action) {
+            try {
+                action.run();
+            } catch (IOException e) {
+                throw new UncheckedIOException(e);
+            }
+        }
+
+        @FunctionalInterface
+        public interface IORunnable {
+            void run() throws IOException;
+        }
+    }
+

src/LegacyApi.java

+import java.io.*;
+
+    public class LegacyApi {
+        public static void main(String[] args) {
+            // Using wrap for a method that returns a result
+            String result = IOExceptionWrapper.wrap(() -> {
+                BufferedReader reader = new BufferedReader(new FileReader("input.txt"));
+                return reader.readLine();
+            });
+            System.out.println("First line: " + result);
+
+            // Using wrapRunnable for a method that returns void
+            IOExceptionWrapper.wrapRunnable(() -> {
+                BufferedWriter writer = new BufferedWriter(new FileWriter("output.txt"));
+                writer.write("Hello, world!");
+                writer.close();
+            });
+            System.out.println("Write successful!");
+        }
+    }