Merge pull request #985 from sagarsane/java-phone-number

Added phone-number assignment test and sammple example.java

assignments/java/phone-number/PhoneNumberTest.java

+import org.junit.Test;
+
+import static org.junit.Assert.*;
+
+public class PhoneNumberTest {
+
+    @Test
+    public void cleansNumber() {
+        final String expectedNumber = "1234567890";
+        final String actualNumber = new PhoneNumber("(123) 456-7890").getNumber();
+
+        assertEquals(
+            expectedNumber, actualNumber
+        );
+    }
+
+    @Test
+    public void cleansNumberWithDots() {
+        final String expectedNumber = "1234567890";
+        final String actualNumber = new PhoneNumber("123.456.7890").getNumber();
+
+        assertEquals(
+            expectedNumber, actualNumber
+        );
+    }
+
+    @Test
+    public void validWhen11DigitsAndFirstIs1() {
+        final String expectedNumber = "1234567890";
+        final String actualNumber = new PhoneNumber("11234567890").getNumber();
+
+        assertEquals(
+            expectedNumber, actualNumber
+        );
+    }
+
+    @Test
+    public void invalidWhenOnly11Digits() {
+        final String expectedNumber = "0000000000";
+        final String actualNumber = new PhoneNumber("21234567890").getNumber();
+
+        assertEquals(
+            expectedNumber, actualNumber
+        );
+    }
+
+    @Test
+    public void invalidWhen9Digits() {
+        final String expectedNumber = "0000000000";
+        final String actualNumber = new PhoneNumber("123456789").getNumber();
+
+        assertEquals(
+            expectedNumber, actualNumber
+        );
+    }
+
+    @Test
+    public void areaCode() {
+        final String expectedAreaCode = "123";
+        final String actualAreaCode = new PhoneNumber("1234567890").getAreaCode();
+
+        assertEquals(
+            expectedAreaCode, actualAreaCode
+        );
+    }
+
+    @Test
+    public void prettyPrint() {
+        final String expectedPrettyNumber = "(123) 456-7890";
+        final String actualPrettyNumber = new PhoneNumber("1234567890").pretty();
+
+        assertEquals(
+            expectedPrettyNumber, actualPrettyNumber
+        );
+    }
+
+    @Test
+    public void prettyPrintWithFullUSPhoneNumber() {
+        final String expectedPrettyNumber = "(123) 456-7890";
+        final String actualPrettyNumber = new PhoneNumber("11234567890").pretty();
+
+        assertEquals(
+            expectedPrettyNumber, actualPrettyNumber
+        );
+    }
+
+}

assignments/java/phone-number/example.java

+public class PhoneNumber {
+
+    private final String number;
+
+    public PhoneNumber(String phoneNumber) {
+        number = normalize(extractDigits(phoneNumber));
+    }
+
+    private String extractDigits(String dirtyNumber) {
+        return dirtyNumber.replaceAll("[^\\d]", "");
+    }
+
+    private String normalize(String number) {
+        if(number.length() == 11 && number.startsWith("1")) {
+            number = number.substring(1, number.length());
+        }
+
+        final boolean numberIsValid = (number.length() == 10);
+        final String normalizedNumber = numberIsValid ? number : "0000000000";
+        return normalizedNumber;
+    }
+
+    public String getNumber() {
+        return number;
+    }
+
+    public String getAreaCode() {
+        return number.substring(0, 3);
+    }
+
+    public String getExchangeCode() {
+        return number.substring(3, 6);
+    }
+
+    public String getSubscriberNumber() {
+        return number.substring(6, 10);
+    }
+
+    public String pretty() {
+        return "(" + getAreaCode() + ") " + getExchangeCode() + "-" + getSubscriberNumber();
+    }
+
+}