Don't change the method's signature:

public class Kata {
    public static int findDeletedNumber(int[] arr, int[] mixedArr) {
        //Your code here
    }
}

Don't create a main method, I already referred you to the docs about that. Also, the starting array being the numbers from 1 to 9 is an example, your function should take that as the first argument. It can be something different too.

This is the initial code for Java:

public class StringToNumber {
  public static int stringToNumber(String str) {
    //TODO: Convert str into a number
  }
}

Your code should be below or replacing that comment line.

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The description says: "[...] return the sum of all of the positive [numbers]". Do you know what sum is? Do you know what return means?

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And that code doesn't do what the kata asks.