下列程序的功能是统计字符串中“array”的个数，在程序的空白处应填入的正确选项是______。 public class FindKeyWords public static void main(sring[]args) sting text= "An array is a data structur that stores a collection of" +"values of the same type. You access each individual value" +"through an integer index. For example, if a is an array" +"of inergers, then a[i] is the ith integer in the array."; Int arrayCount=0; Int idex=-1; Sting arrarStr="array"; Index=text. indexof(arrayStr); While(index______0) ++arrayCount; Index+=arrayStr. length(); Index=text. indexof(arrayStr，index);
System. out. println ("the text contains"+arrayCount+"arrays");