P1-P5: rewrite to match current syllabus

Signed-off-by: Amneesh Singh <natto@weirdnatto.in>

P2.java

@@ -1,11 +1,15 @@
-class P2 {
-  public static void main(String[] _args) {
-      int a = 5, b, f;
-      b = f = a;
+import java.util.StringTokenizer;
 
-      while (b-- > 1)
-          f *= b;
+public class P2 {
+    public static void main(String[] args) {
+        String input = "Hello, I am Batu Khan and I am about to blow.";
+        
+        StringTokenizer tokenizer = new StringTokenizer(input, " ,");
 
-      System.out.println(a + "! = " + f);
-  }
-}
+        int i = 0;
+        while (tokenizer.hasMoreTokens()) {
+            String token = tokenizer.nextToken();
+            System.out.println("Token " + ++i + ": " + token);
+        }
+    }
+}