My fork

src/main/java/com/oracle/arrays/impl/MultidimensionalImpl.java

@@ -4,13 +4,28 @@
 import com.oracle.arrays.model.Posicion;
 
 public class MultidimensionalImpl implements Multidimensional {
+    Posicion position;
+
     @Override
     public Posicion getPosition(String[][] datos, String dato) {
+        position = new Posicion(0, 0);
+        for (int i = 0; i < datos.length; i++) {
+            for (int j = 0; j < datos[i].length; j++) {
+                if (datos[i][j].equals(dato)) {
+                    position.setX(i);
+                    position.setY(j);
+                    return position;
+                }
+            }
+        }
         return null;
     }
 
     @Override
     public String getData(String[][] datos, Posicion posicion) {
-        return null;
+        String data;
+        data = datos[posicion.getX()][posicion.getY()];
+        return data;
     }
+
 }

src/main/java/com/oracle/arrays/impl/UnidimensionalImpl.java

@@ -5,10 +5,32 @@
 public class UnidimensionalImpl implements Unidimensional {
     @Override
     public void ordenamiento(int[] arr) {
+        for(int i = 0; i < arr.length; i++){
+            for(int j = i+1; j< arr.length; j++){
+                if(arr[i]> arr[j]){
+                    int temp = arr[i];
+                    arr[i]= arr[j];
+                    arr[j]= temp;
+                }
+            }
+        }
     }
 
     @Override
     public int[] ordenamientoReversa(int[] arr) {
-        return null;
+         for(int i = 0; i < arr.length; i++){
+            for(int j = i+1; j< arr.length; j++){
+                if(arr[i]< arr[j]){
+                    int temp = arr[i];
+                    arr[i]= arr[j];
+                    arr[j]= temp;
+                }
+            }
+        }
+         int cpyArr [] = new int[arr.length];
+         for(int i = 0; i<arr.length; i++){
+             cpyArr[i]= arr[i];
+         }
+        return cpyArr;
     }
 }