got alot done still need to finish the Many to one Relationship

PhoneBook.java

@@ -1,7 +1,69 @@
  
-
+import java.util.*;
 /**
  * Created by leon on 1/23/18.
  */
 public class PhoneBook {
+    
+    Map<String, ArrayList<String> > entries = new HashMap<String, ArrayList<String>>();
+    
+    public void add (String name, String phoneNumber){
+        ArrayList<String> pn = new ArrayList<String>();
+        pn.add(phoneNumber);
+        this.entries.put(name, pn);
+    }
+    
+    public void addNumber(String name, String phoneNumber){
+        for(Map.Entry<String, ArrayList<String>> entry: this.entries.entrySet()){
+            if(name.equals(entry.getKey())){
+                entry.getValue().add(phoneNumber);
+                break;
+            }
+        }    
+    }
+    
+    public void remove(String name, String phoneNumber){
+    }
+    
+    public void removeRecord(String name){
+        this.entries.remove(name);
+    }
+    
+    
+    
+    public void lookUp(String name){
+        System.out.print(this.entries.get(name));
+    }
+    
+    public String reverseLoopup(String phoneNumber){
+        String name = "No Records...";
+        for(Map.Entry<String, ArrayList<String>> entry: this.entries.entrySet()){
+            
+            for(String pn : entry.getValue()){
+                if(pn.equals(phoneNumber)){
+                    name = entry.getKey();
+                }
+            }
+            
+        }
+        return name;
+        
+    }
+    
+    
+    public void display() {
+        StringBuilder sb = new StringBuilder();
+        
+        for(Map.Entry<String, ArrayList<String>> entry :this.entries.entrySet()){
+            sb.append(entry.getKey());
+            sb.append(" - ");
+            sb.append(entry.getValue());
+            sb.append("\n");
+        }
+        
+        System.out.print(sb.toString());
+    }
+   
+    
+    
 }