u24 b

uebungen/u24/DoubleSpace.java

@@ -6,7 +6,7 @@ import java.util.*;
  */
 public class DoubleSpace {
     public static void main(String[] args) throws FileNotFoundException {
-        doubleSpace("test.txt","out.txt");
+        doubleSpace2("test.txt","out.txt");
     }
 
     /**
@@ -29,4 +29,40 @@ public class DoubleSpace {
         output.close();
         input.close();
     }
+
+    /**
+     * Duplizierzt Leerzeilen bzw Zeilenumbrueche der
+     * Datei inputFileName und speichert das Ergebnis in
+     * outputFileName ab
+     * Inklusive Fehlerbehandlung
+     */
+    public static void doubleSpace2(String inputFileName, String outputFileName) {
+
+        Scanner input = null;
+        PrintStream output = null;
+
+        try {
+
+            input = new Scanner(new File(inputFileName));
+            output = new PrintStream(new File(outputFileName));
+
+            if (input.hasNextLine()) {
+                output.println(input.nextLine());
+            }
+            while (input.hasNextLine()) {
+                output.println();
+                output.println(input.nextLine());
+            }
+
+        } catch (FileNotFoundException e) {
+
+            System.out.println(e.getMessage());
+
+        } finally {
+
+            if (output != null) output.close();
+            if (input != null) input.close();
+
+        }
+    }
 }