work in class ARRAYS

//ArraySum

public class ArraySum
{
  public static void main(String[] args)
  {
    int[] myNumbers = new int[]{5, 7, 3};

    int sum = 0;
    for (int i = 0; i < myNumbers.length; i++) {
      sum += myNumbers[i];
    }
    System.out.println("sum: " + sum);
  }
}

//FindElementIndex

import java.util.Scanner;

public class FindElementIndex
{
  public static void main(String[] args)
  {
    int[] myNumbers = new int[]{5, 7, 3};
    Scanner scanner = new Scanner(System.in);

    System.out.println("Which number's index want to know? : ");
    int findIndex = scanner.nextInt();


    boolean founded = false;

    for (int i = 0; i < myNumbers.length; i++) {

      if (myNumbers[i] == findIndex) {
        System.out.println("position: " + i);
        founded = true;
      }
    }
    if (!founded) {
      System.out.println("-1");
    }
  }
}

//ArraysEquals

public class ArrayEquals
{
  public static void main(String[] args)
  {
    int[] firstArray = new int[]{5, 7, 3};
    int[] secondArray = new int[]{5, 7, 3};
    boolean ednakvi = true;

    for (int i = 0; i < firstArray.length; i++) {
      if (firstArray[i] != secondArray[i]) {
        ednakvi = false;
        break;
      }
    }
    if (ednakvi) {
      System.out.println("ednakvi sa!!!");
    }
    else {
      System.out.println("ne sa ednakvi");
    }
  }
}

//RemoveOddElementIndex

import java.util.Arrays;

public class RemoveOddElement
{
  public static void main(String[] args)
  {
    int[] firstArray = new int[]{5, 7, 3, 12, 4};
    int[] newArray = new int[firstArray.length/2];
    int index = 0;

    for (int i = 0; i < firstArray.length; i++) {
      if (i % 2 != 0) {                       //chetniqt index za normalnite e necheten za programistite
        newArray[index] = firstArray[i];
        index++;
      }
    }
    System.out.println(Arrays.toString(newArray));




  }
}