Arrays.copyof

 public static int[] copyOf(int[] original, int newLength) {
        int[] copy = new int[newLength];
        System.arraycopy(original, 0, copy, 0,
                         Math.min(original.length, newLength));
        return copy;
    }

int[] strArray = new int[] {1,2,3,4};
int[] copyArray=Arrays.copyOf(strArray,2);

int[] strArray = new int[] {1,2,3,4};
int[] copyArray=Arrays.copyOf(strArray,10);

int[] strArray = new int[] {1,2,3,4};
        int[] copyArray = new int[4];
        System.arraycopy(strArray, 0, copyArray, 0, 5);