We would like to know how to double the size of an array.
public class MainClass { public static void main (String args[]) { int array1[] = {1, 2, 3, 4, 5}; int array2[] = {1, 2, 3, 4, 5, 6, 7, 8, 9}; System.out.println("Original size: " + array1.length); System.out.println("New size: " + doubleArray(array1).length); System.out.println("Original size: " + array2.length); System.out.println("New size: " + doubleArray(array2).length); }// ww w. j a v a 2s . co m static int[] doubleArray(int original[]) { int length = original.length; int newArray[] = new int[length*2]; System.arraycopy(original, 0, newArray, 0, length); return newArray; } }
The code above generates the following result.