Can you tell me what is wrong with the class?

import java.util.*; class ArrayFunctions implements ArrayFunctionsInterface{ --- java is saying this is wrong // create array public double [] sortMe(double [] array){ double [] newArray = new double[array.length];

for(int i = 0; i < array.length - 1; i++){ int index = i;

for(int j = i + 1; j < array.length; j ++){ if (array[j] < array[index]) index = j; double smallNumber = array[index]; array[index] = array[i]; array[i] = smallNumber; } return array; } } public double getMax(double [] array){ sortMe(array); return array[array.length - 1]; }

public double getMin(double [] array){ sortMe(array); return array[0]; }

public int whereAmI(double [] array, double searchValue){ int index = 0; for (int i = 0; i < array.length; i++){ if(array[i] == searchValue){ index = i; } } return index; }

public double sumMeUp(double [] array){ double sum = 0; for(int i = 0; i < array.length; i++){ sum += array[i]; } return sum; }

public double[] reverseMe(double [] array){ for(int i = 0; i < array.length/2; i ++){ double temp = array[i]; array[i] = array[array.length - i - 1]; array[array.length - i - 1] = temp; } return array; }

public void printMe(double [] array){ for(int i = 0; i < array.length; i++){ System.out.println(array[i] + " "); } } public double[] doubleMyCapactiy(double[] array){ double [] newArray = new double[array.length * 2]; for(int i = 0; i < array.length; i++){ newArray[i] = array[i]; } return newArray; } }

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below is the interface:

public interface ArrayFunctionsInterface{ double [ ] sortMe(double [ ] array); double getMax(double [ ] array); double getMin(double [ ] array); int whereAmI(double [ ] array, double searchValue); double sumMeUp(double [ ] array); double [ ] reverseMe(double [ ] array); void printMe(double [ ] array); double[ ] doubleMyCapacity(double [ ] array); }