Cannot find symbol Java error?

Question

The code works when I used java.util.Arrays.sort(numbers); Am I doing something wrong? This seems weird to me.

import java.util.Arrays.*;

class Test {
   public static void main(String[] args) {
    double[] numbers = {6.0, 4.4, 1.9, 2.9, 3.4, 3.5};
    char[] chars = {'a', 'A', '4', 'F', 'D', 'P'};

    sort(numbers);

    System.out.println(binarySearch(numbers, 3));

   }
}

(Error displayed in terminal)

Test.java:8: error: cannot find symbol
    sort(numbers);
    ^
symbol:   method sort(double[])
location: class Test
 Test.java:10: error: cannot find symbol
    System.out.println(binarySearch(numbers, 3));
                       ^
 symbol:   method binarySearch(double[],int)
 location: class Test
  2 errors

Answer 1

It's a static method of the class Arrays.

You should invoke it like this:

Arrays.sort(someArray);

Note you still have to import the Arrays class like this:

import java.util.Arrays;

Or as others have mentioned, if you do a static import you can omit the class name.

I would argue that Arrays.sort() is better for readability.