Java：新建数组
Array Initialization
int[] a; = int a[];
int[] a = new int[100]; a[]的值会被初始化为0
`int[] smallPrimes = {2, 3, 5, 7, 11, 13};
new int[] {17, 19, 23, 29, 31, 37};
smallPrimes = new int[] {17, 19, 23, 29, 31, 37} 在不新建数组的情况下重新初始化一个数组变量
int[] anonymous = {17, 19, 23, 29, 31, 37};
Array Copying
int[] luckyNumbers = smallPrimes;
luckyNumbers[5]=12; // now smallPrimes[5] is also 12
int[] copiedLuckyNumbers = Arrays.copyof(luckyNumbers, luckyNumbers.length);