3.15 operation of the array 5 basic lookup

/* Requirements: Array element Lookup (finds the index of the first occurrence of the specified element in the array) analysis: A: Defines an array and initializes it statically. B: Write a function to iterate through the array, get each element in the array sequentially, and compare the known data to return the current index value if it is equal. */class arraytest5 {public static void main (String[] args)  {//  defines an array, and static initialization of the int[] arr = { 200, 250, 38, 888, 444 };//  Requirement: I want to find 250 index Int index = getindex (arr, 250) in this array for the first time; System.out.println ("250 The first occurrence of the index in the array is:"  + index); Int index2 = getindex2 (arr, 250) ; System.out.println ("250 The first occurrence of the index in the array is:"  + index2); Int index3 = getindex2 (arr,  2500); SYSTEM.OUT.PRINTLN ("2500 The first occurrence of the index in the array is:"  + index3);} /* Requirements: Find the index of the first occurrence of the specified data in the array two explicit: return value type: int parameter list:int[] arr,int value*/public static int  GetIndex (Int[] arr, int value)  {//  iterates through the array, gets each element in the array, and compares the known data for  (int x  = 0; x < arr.length; x++)  {if  (arr[x] == value)  {//   Returns the current index value if it is equal. Return x;}}   The current code has a small problem//  is that if you want to find the data in the array does not exist, then can not find, find, the corresponding return?//  so error.   As long as the judgment, it may be false, so be careful.   If no data is found, a negative number is usually returned, and returns -1RETURN&NBSP;-1;} Public static int getindex2 (Int[] arr, int value)  {//  define an index int  index = -1;//  Modify the index value for  (int x = 0; x < arr.length;  x++)  {if  (Arr[x] == value)  {index = x;break;}}   return to Indexreturn index;}}

3.15 operation of the array 5 basic lookup