finished part 1

PhoneBook.java

@@ -1,7 +1,41 @@
- 
+import java.util.*; 
 
 /**
  * Created by leon on 1/23/18.
  */
 public class PhoneBook {
+    String name;
+    String phoneNumber;
+    SortedMap<String, String> phoneBook = new TreeMap<String, String>();
+    
+    public void add(String name, String phoneNumber){
+        phoneBook.put(name, phoneNumber);
+    }
+    
+    public void remove(String name){
+        phoneBook.remove(name);
+    }
+    
+    public String lookup(String name){
+        return phoneBook.get(name);
+    }
+    
+    public String reverseLookup(String phoneNumber){
+        for(Map.Entry<String, String> e : phoneBook.entrySet()){
+            if(e.getValue().equals(phoneNumber)){
+                return e.getKey();
+            }
+        }
+        return null;
+    }
+    
+    public void display(){
+        System.out.printf("%-20s%-12s\n", "Name", "Phone Number");
+        for(Map.Entry<String, String> e : phoneBook.entrySet()){
+            String printName = e.getKey();
+            String printNumber = e.getValue();
+            System.out.printf(" %-20s %-12s\n", printName, printNumber);
+        }
+        System.out.printf("-----End of the phone book-----\n");
+    }
 }

PhoneBookTest.java

@@ -1,5 +1,4 @@
 
-
 import static org.junit.Assert.*;
 import org.junit.After;
 import org.junit.Before;
@@ -13,30 +12,110 @@ import org.junit.Test;
  */
 public class PhoneBookTest
 {
-    /**
-     * Default constructor for test class PhoneBookTest
-     */
-    public PhoneBookTest()
-    {
+    @Test
+    public void testAdd(){
+        //given
+        PhoneBook phoneBook = new PhoneBook();
+
+        //actual
+        phoneBook.add("eric", "3025884804");
+        String actual = phoneBook.lookup("eric");
+
+        //expected
+        String expected = "3025884804";
+
+        //test
+        assertEquals(expected, actual);
+    }
+
+    @Test
+    public void testAddMultiple(){
+        //given
+        PhoneBook phoneBook = new PhoneBook();
+
+        //actual
+        phoneBook.add("eric", "3025884804");
+        phoneBook.add("john", "3025844804");
+        phoneBook.add("jane", "3025884704");
+        String actual = phoneBook.lookup("eric");
+        String actual1 = phoneBook.lookup("john");
+        String actual2 = phoneBook.lookup("jane");
+
+        //expected
+        String expected = "3025884804";
+        String expected1 = "3025844804";
+        String expected2 = "3025884704";
+
+        //test
+        assertEquals(expected, actual);
+    }
+
+    @Test
+    public void testRemove(){
+        //given
+        PhoneBook phoneBook = new PhoneBook();
+
+        //actual
+        phoneBook.add("eric", "3025884804");
+        phoneBook.remove("eric");
+        String actual = phoneBook.lookup("eric");
+
+        //expected
+        String expected = null;
+
+        //test
+        assertEquals(expected, actual);
     }
 
-    /**
-     * Sets up the test fixture.
-     *
-     * Called before every test case method.
-     */
-    @Before
-    public void setUp()
-    {
+    @Test
+    public void testRemoveMultiple(){
+        //given
+        PhoneBook phoneBook = new PhoneBook();
+
+        //actual
+        phoneBook.add("eric", "3025884804");
+        phoneBook.add("john", "3025844804");
+        phoneBook.add("jane", "3025884704");
+        phoneBook.remove("john");
+        phoneBook.remove("eric");
+        String actual = phoneBook.lookup("john");
+        String actual1 = phoneBook.lookup("eric");
+        String actual2 = phoneBook.lookup("jane");
+
+        //expected
+        String expected = null;
+        String expected1 = null;
+        String expected2 = "3025884704";
+
+        //test
+        assertEquals(expected, actual);
+        assertEquals(expected1, actual1);
+        assertEquals(expected2, actual2);
     }
 
-    /**
-     * Tears down the test fixture.
-     *
-     * Called after every test case method.
-     */
-    @After
-    public void tearDown()
-    {
+    @Test
+    public void testReverseLookup(){
+        //given
+        PhoneBook phoneBook = new PhoneBook();
+
+        //actual
+        phoneBook.add("eric", "3025884804");
+        phoneBook.add("john", "3025844804");
+        phoneBook.add("jane", "3025884704");
+        String actual = phoneBook.reverseLookup("3025884804");
+        String actual1 = phoneBook.reverseLookup("3025844804");
+        String actual2 = phoneBook.reverseLookup("3025884704");
+        String actual3 = phoneBook.reverseLookup("4025884704");
+
+        //expected
+        String expected = "eric";
+        String expected1 = "john";
+        String expected2 = "jane";
+        String expected3 = null;
+
+        //test
+        assertEquals(expected, actual);
+        assertEquals(expected1, actual1);
+        assertEquals(expected2, actual2);
     }
 }

PhoneNumbers.java

@@ -0,0 +1,33 @@
+
+/**
+ * Write a description of class PhoneNumbers here.
+ *
+ * @author (your name)
+ * @version (a version number or a date)
+ */
+public class PhoneNumbers
+{
+    // instance variables - replace the example below with your own
+    private int x;
+
+    /**
+     * Constructor for objects of class PhoneNumbers
+     */
+    public PhoneNumbers()
+    {
+        // initialise instance variables
+        x = 0;
+    }
+
+    /**
+     * An example of a method - replace this comment with your own
+     *
+     * @param  y  a sample parameter for a method
+     * @return    the sum of x and y
+     */
+    public int sampleMethod(int y)
+    {
+        // put your code here
+        return x + y;
+    }
+}