How to define an array size in java without hardcoding?

To avoid hard coding you can read the size of the array from the user using command line arguments of the reader classes like Scanner. Then using this value create an array:

Example

import java.util.Arrays; import java.util.Scanner; public class PopulatingAnArray {    public static void main(String args[]) {       System.out.println("Enter the required size of the array :: ");       Scanner s = new Scanner(System.in);       int size = s.nextInt();       int myArray[] = new int [size];       System.out.println("Enter the elements of the array one by one ");       for(int i=0; i<size; i++) {          myArray[i] = s.nextInt();       }       System.out.println("Contents of the array are: "+Arrays.toString(myArray));    } }

Output

Enter the required size of the array :: 5 Enter the elements of the array one by one 78 96 45 23 45 Contents of the array are: [78, 96, 45, 23, 45]