correctly //Program copies data array into prices array using a deep copy i import java.util.Scanner; public class CopyArrayGood { public static void main (String [] args) { double [] data = {1.25, 4.95, 5.00, .99, 10.23}; double [] prices = new double [data.length]; // double [] prices = data; DO NOT DO THIS
//but rather copy element by element for (int i = 0; i < data.length; i++) { prices[i] = data[i]; } //OR use System.arraycopy // System.arraycopy(data, 0, prices, 0, data.length); System.out.println("original array is :"); printArray(data); System.out.println("copy is array :"); printArray(prices); //change 3rd element in prices array to 10.00 - this should not effect original array //but it does becasue the copy was a shallow copy - copied the references not the contents prices[2] = 10.00; System.out.println("original array is :"); printArray(data); System.out.println("copy array is :"); printArray(prices); } //Method to print contents of an array public static void printArray(double[] arr) { for(int i = 0; i < arr.length; i++) { System.out.println(arr[i]); } } }