问答题 本程序找出字符串数组arr={"welcome","China","hi","congratulation","great"}；中长度最大的元素，并打印输出。
public class exam_81{
public static void main(String[] args) {
______arr={"welcome","China","hi","congratulation","great"};
int i=0;
int pos=0;
int length=0;
while(______){
if(arr[i].length()＞length){
length=arr[i].length();
______;
}
i++;
}
System.out.println("The string of max length is:"+arr[pos]);
}
}