Create SwapCase.java

SedaKunda · web-flow · commit cf4db8c2baeb · 2016-07-08T09:41:40.000+02:00
diff --git a/Easy-Level/SwapCase.java b/Easy-Level/SwapCase.java
@@ -0,0 +1,27 @@
+/*
+Write a program which swaps letters' case in a sentence. All non-letter characters should remain the same.
+*/
+
+import java.io.*;
+        public class Main {
+            public static void main (String[] args) throws IOException {
+                File file = new File(args[0]);
+                BufferedReader br = new BufferedReader(new FileReader(file));
+                   String line;
+                   while ((line = br.readLine()) != null) { 
+                     for (int i = 0; i < line.length(); i++) {
+                       if (Character.isLowerCase(line.charAt(i))) {
+                         System.out.print(Character.toUpperCase(line.charAt(i)));
+                       }
+                       else if (Character.isUpperCase(line.charAt(i))) {
+                         System.out.print(Character.toLowerCase(line.charAt(i)));
+                       }
+                       else {                      
+                         System.out.print(line.charAt(i));
+                       }
+                     }
+                     System.out.println();                  
+                   }
+                   br.close();
+            }
+        }
