4.22 The perfection of the tool class

/* Operations on arrays How to make a manual? A: Write a tool Class B: How do you add a document comment to this class? Add something? C: Parsing document annotations with tools Javadoc tool D: Format javadoc-d directory-author-version Arraytool.java directory: You can write the path of a folder to make a Help document error: Cannot find a public or protected class that can be documented: tells us that the class does not have sufficient permissions */class the Arraydemo {publicly static void main (String [] args) {//define array int[] arr = {28, 55, 37, 46, 19};//Traverse Arraytool.printarray (arr);//Get the most value int max = Arraytool.getmax (arr); System.out.println ("Max:" + max);//Gets the index value of 55 int index = Arraytool.getindex (arr, 55); System.out.println ("index:" + index);}}

/***  This is a tool class for manipulating arrays *  @author  msirene*  @version  v.10*/public class arraytool  {//  The construction method is private, the outside world can not create objects/***  this is a private structure */private arraytool ()  {}/***  This is the way to iterate over the array, The format after traversal is: [element 1,  element 2,  element 3,  ...] *  @param  arr  This is the array to be traversed */public static void printarray (Int[] arr)  { System.out.print ("[");for  (int x = 0; x < arr.length; x++)  {if   (x == arr.length - 1)  {system.out.println (arr[x] +  "]");}  else {system.out.print (arr[x] +  ", ");}} /***  This is the method to get the maximum value in the array *  @param   arr  This is the array to get the maximum value *  @return   Returns the maximum value in the array */public  static int getmax (Int[] arr)  {int max = arr[0];for  (int x  = 1; x < arr.length; x++)  {if  (Arr[x] > max)  { MAX&NBSP;=&NBSP;ARR[X];}} return max;}/***  gets the index of the first occurrence of the specified element in the array, and returns the -1*  @param  arr  found array  *  @param if the element does not exist  value   The element to find *  @return   Returns the index of the element in the array, or -1*/public static int getindex (int[]  if it does not exist) Arr, int value)  {int index = -1;for  (int x = 0; x  < arr.length; x++)  {if  (Arr[x] == value)  {index = x;break;}} Return index;}}

4.22 The perfection of the tool class