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Address Book/AddressBook.java

@@ -0,0 +1,30 @@
+import java.util.*;
+
+public class AddressBook {
+    private List<Address> addresses;
+
+    public AddressBook() {
+        addresses = new ArrayList<Address>();
+    }
+
+    public List<String> onStreet(String st) {
+        ArrayList<String> result = new ArrayList<String>();
+
+        for(Address a : addresses) {
+            if(a.getStreet())
+        }
+    }
+
+    public int newBusiness(String nm, String st, int no) {
+        for(int i = 0; i < addresses.size(); i++) {
+            Address a = addresses.get(i);
+            if(a.getStreet().equals(st) && a.getNumber() == no) {
+                addresses.set(i, new Address(nm, st, no));
+                return i;
+            }
+        }
+        addresses.add(new Address(nm, st, no));
+
+        return addresses.size() - 1;
+    }
+}