Merge remote-tracking branch 'upstream/master'

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diff --git a/challenge-110/cheok-yin-fung/java/PhoneNumber.java b/challenge-110/cheok-yin-fung/java/PhoneNumber.java
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+// The Weekly Challenge 110
+// Task 1 Valid Phone Numbers
+
+import java.io.File;
+import java.util.Scanner;
+import java.io.FileNotFoundException;
+
+// Usage: java PhoneNumber [file name]
+
+public class PhoneNumber
+{
+    public static void main(String[] args) throws Exception 
+    {
+        try { 
+            File file = new File(args[0]);
+            Scanner sc = new Scanner(file);
+            while (sc.hasNextLine()) {
+                String num = sc.nextLine();
+                if ( checkHead(num) && checkMid(num) &&
+                     num.substring(5).trim().length() == 10 && checkTail(num))
+                    System.out.println(num);
+            }
+        } catch (FileNotFoundException e) {
+            System.out.println(e.getMessage());
+            System.exit(0);
+        } catch (IndexOutOfBoundsException e) {
+            System.out.println("Usage: java PhoneNumber [file name]");
+            System.exit(0);
+        }
+    }
+
+    private static boolean checkHead(String tel)
+    {
+        tel = tel.trim();
+        if (tel.charAt(0) == '+' 
+            && isNumeric(tel.charAt(1))
+            && isNumeric(tel.charAt(2)) )
+             return true;
+        
+        if (tel.charAt(0) == '(' && tel.charAt(3) == ')'
+            && isNumeric(tel.charAt(1))
+            && isNumeric(tel.charAt(2)))
+             return true;
+
+        boolean temp_bl = true;
+        for (int a = 0; a < 4 && temp_bl ; a++) 
+            temp_bl = temp_bl && isNumeric(tel.charAt(a));
+        return temp_bl;
+    }
+
+    private static boolean checkMid(String tel)
+    {
+        return tel.charAt(4) == ' ';
+    }
+
+    private static boolean checkTail(String tel)
+    {
+        boolean temp_bl = true;
+        for (int i = 0; i < 10  && temp_bl ; i++) 
+            temp_bl = temp_bl && isNumeric(tel.charAt(5+i));
+        return temp_bl;
+    }
+
+    private static boolean isNumeric(char ch)
+    {
+        if (ch >= '0' && ch <= '9') return true;
+        else return false;
+    }
+
+}