Java String Instance

Requirement 1: The way to achieve trim yourself.

Requirement 2: Get the Upload file name "D:\\20120512\\day12\\demo1.java".

Requirement 3: reverse the characters stored in the string object. New China Good-----> Good Country New

Requirement 4: Find the number of occurrences of a substring in the entire string.

Public class demo6 {public static void main (String[] args)  {String  str  = "         Wisdom           podcasts               "; SYSTEM.OUT.PRINTLN (Mytrim (str));str =   "D:\\20120512\\day12\\demo1.java"; GetFileName (str); str  =  "New China Good"; System.out.println ("Flipped string:" + reverse (str));str =  "Abcjavaabcjavaphpjava";   // Javagetcount (str,  "Java");} Count substring occurrences   Public static void getcount (string str,string target) {Int count  = 0 ; //used to record the number of occurrences int fromindex  = 0; //  The record starts with that index value looking for the target substring while ((Fromindex = str.indexof (Target, fromindex))!=-1) {//If the IndexOf method returns   is not-1, then the target   element has been found. Count++;fromindex = fromindex+target.length ();} System.out.println ("Number of occurrences:" + cOunt);} Public static string reverse (STRING&NBSP;STR) {Char[] arr = str.tochararray (); (int startindex = 0 , endindex=arr.length-1 ; startindex<endindex;  startindex++,endindex--) {char temp = arr[startindex];arr[startindex] = arr[endindex]; Arr[endindex] = temp;} Constructs a string using a character array. Return new string (arr);} Requirements 2:  Get the upload file name    "D:\\20120512\\day12\\demo1.java". Public static void getfilename (String path) {int index = path.lastindexof ("\ \"); String filename = path.substring (index+1); System.out.println ("File name:" + filename);} Requirement 1: The way to achieve trim yourself. Public static string mytrim (STRING&NBSP;STR) {//Convert first to character   array char[] arr =  Str.tochararray ();//define two   variables record the start and end   index values Int startindex = 0 ;int endindex  = arr.length -1;//determines the index value of start   while (true) {if (arr[startindex]== '   ') {startindex++;} Else{break;}} Determines the index value of end  : while (true) {if (arr[endindex]== '   ') {endindex--;} Else{break;}} Intercept substring return return str.substring (startindex,endindex+1);}}

Java String Instance