java数组下标怎么获取 java获取数组元素下标

求数组中元素的下标，若元素不存在则输出-1

public class Practice6 {
 public static int index (int[] array,int n) {
  for(int i=0;i<5;i++) {
   if(array[i]==5) {
    return i;
   }
  }
  return -1;
 }
 public static void main (String[] args){
  int a;
  int[] array={6,7,4,9,5};
  int b;
  b=index(array,5);
 System.out.printf("5的下标是%d%n",b);
 }
}