How to return a specific element of an array?

问题

I want to return odd numbers of an array yet Eclipse doesn't seem to accept my return array[i]; code. I think it requires returning a whole array since I set an array as a parameter to my method. As I said before, I need to pass an array and get a specific element of that array in return. Even if I make that array static, how do I return a single element?

Edit : Alright then, here it is:

public class newClass{
public static void main(String[] args) 
{       
    int [] newArray= new int [4];
    int [] array = {4,5,6,7};

    newArray[0] = array[0]+array[1]+array[2]+array[3];
    newArray[1] = array[0]*array[1]*array[2]*array[3];
    newArray[2] = findOut(array);

}

public static int findOut (int [] array3)
{
    int e1=0;
    int e2=0;
    for (int i=0; i<array3.length; i++)
    {
        if (array3[i]%2==0)
        {
            e1+=array3[i];
            array3[i]=e1
            return array3[i];
        }

        else
        {
            e2+=array3[i];
            array3[i]=e2;
            return array3[i];

        }

    }

}


}

I know there are probably more than a few mistakes here but I'm working on it and I'm not only returning odd numbers, I also add them together.

回答1:

You code should look like this:

public int getElement(int[] arrayOfInts, int index) {
    return arrayOfInts[index];
}

Main points here are method return type, it should match with array elements type and if you are working from main() - this method must be static also.

回答2:

I want to return odd numbers of an array

If i read that correctly, you want something like this?

List<Integer> getOddNumbers(int[] integers) {
  List<Integer> oddNumbers = new ArrayList<Integer>();
  for (int i : integers)
    if (i % 2 != 0)
      oddNumbers.add(i);
  return oddNumbers;
}

回答3:

Make sure return type of you method is same what you want to return. Eg: `

  public int get(int[] r)
  {
     return r[0];
  }

Note : return type is int, not int[], so it is able to return int.

In general, prototype can be

public Type get(Type[] array, int index)
{
    return array[index];
}

回答4:

(Edited.) There are two reasons why it doesn't compile: You're missing a semi-colon at the end of this statement:

array3[i]=e1

Also the findOut method doesn't return any value if the array length is 0. Adding a return 0; at the end of the method will make it compile. I've no idea if that will make it do what you want though, as I've no idea what you want it to do.

来源：https://stackoverflow.com/questions/19376735/how-to-return-a-specific-element-of-an-array

标签

java

arrays

parameters

elements