text: //
  //  NSStringWrapper.h
  //  NSStringWrapper
  //
  //  Created by Tang Qiao on 12-2-4.
  //  Copyright (c) 2012年 blog.devtang.com. All rights reserved.
  //
  
  #import <Foundation/Foundation.h>
  
  #define JavaNotFound -1
  
  @interface NSString (Wrapper)
  
  /**  Return the char value at the specified index. */
  - (unichar)charAt:(int)index;
  
  /**
   * Compares two strings lexicographically.
   * the value 0 if the argument string is equal to this string;
   * a value less than 0 if this string is lexicographically less than the string argument;
   * and a value greater than 0 if this string is lexicographically greater than the string argument.
   */
  - (int)compareTo:(NSString *)anotherString;
  
  - (int)compareToIgnoreCase:(NSString *)str;
  
  - (BOOL)contains:(NSString *)str;
  
  - (BOOL)startsWith:(NSString *)prefix;
  
  - (BOOL)endsWith:(NSString *)suffix;
  
  - (BOOL)equals:(NSString *)anotherString;
  
  - (BOOL)equalsIgnoreCase:(NSString *)anotherString;
  
  - (int)indexOfChar:(unichar)ch;
  
  - (int)indexOfChar:(unichar)ch fromIndex:(int)index;
  
  - (int)indexOfString:(NSString *)str;
  
  - (int)indexOfString:(NSString *)str fromIndex:(int)index;
  
  - (int)lastIndexOfChar:(unichar)ch;
  
  - (int)lastIndexOfChar:(unichar)ch fromIndex:(int)index;
  
  - (int)lastIndexOfString:(NSString *)str;
  
  - (int)lastIndexOfString:(NSString *)str fromIndex:(int)index;
  
  - (NSString *)substringFromIndex:(int)beginIndex toIndex:(int)endIndex;
  
  - (NSString *)toLowerCase;
  
  - (NSString *)toUpperCase;
  
  - (NSString *)trim;
  
  - (NSString *)replaceAll:(NSString *)origin with:(NSString *)replacement;
  
  - (NSArray *)split:(NSString *)separator;
  
  @end
  