find the product of all elements in an array in java

  int product = 1;
  for (int i=0;i<arr.length;i++) {
      product *= arr[i];
  }

This code begins by initializing a variable called product and setting it equal to 1, as the product of an array with no elements is usually considered to be 1. Then a for loop is used to iterate through all of the elements in the array and then use the product variable to keep track of the overall product of the array. Each element in the array is then multiplied against the existing product. The loop then ends after reaching the last element in the array, and the product variable will then hold the final product of the array.