How to write a method in java to multiply each element in an array by *2

 /**
     * 在原来的数组上扩大2倍
     * @param array
     */
    public static void enlarge(int[] array){
        for (int i = 0; i <array.length ; i++) {
            array[i] = array[i]*2;
        }
 
    }
 
    public static void main(String[] args) {
        int[] array = {1,2,3,4,5,6,7};
        enlarge(array);
        System.out.println(Arrays.toString(array));
    }

/**
     * 把原来数组扩大2倍的值放在一个新的数组中
     * @param array
     * @return
     */
    public static int[] func(int[] array) {
        int[] ret = new int[array.length];
        for (int i = 0; i < array.length; i++) {
            ret[i] = array[i] * 2;
        }
        return ret;
    }
 
    public static void main(String[] args) {
        int[] array = {1,2,3,4,5,6,7};
       int[] ret =  func(array);
        System.out.println(Arrays.toString(ret));
    }