对于数组变量，通过直接赋值和通过new有什么区别呢？
比如String[] a={"","",""}和 String[] a=new String{"","",""}

String[] a=new String{"","",""}写错了
应该String[] a=new String[]{"","",""}
String[] a=new String[]{"","",""}还可以指定元素的个数，嗯，就这样吧