NSString+NSStringForJava.m

    //
    //  NSString+NSStringForJava.m
    //  NSStringCategory
    //
    //  Created by Ryan Tang on 12-10-17.
    //  Copyright (c) 2012年 Ericsson Labs. All rights reserved.
    //  

    #import "NSString+NSStringForJava.h"  

    @implementation NSString (NSStringForJava)  

    //对比两个字符串内容是否一致
    - (BOOL) equals:(NSString*) string
    {
        return [self isEqualToString:string];
    }  

    //判断字符串是否以指定的前缀开头
    - (BOOL) startsWith:(NSString*)prefix
    {
        return [self hasPrefix:prefix];
    }  

    //判断字符串是否以指定的后缀结束
    - (BOOL) endsWith:(NSString*)suffix
    {
        return [self hasSuffix:suffix];
    }  

    //转换成小写
    - (NSString *) toLowerCase
    {
        return [self lowercaseString];
    }  

    //转换成大写
    - (NSString *) toUpperCase
    {
        return [self uppercaseString];
    }  

    //截取字符串前后空格
    - (NSString *) trim
    {
        return [self stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
    }  

    //用指定分隔符将字符串分割成数组
    - (NSArray *) split:(NSString*) separator
    {
        return [self componentsSeparatedByString:separator];
    }  

    //用指定字符串替换原字符串
    - (NSString *) replaceAll:(NSString*)oldStr with:(NSString*)newStr
    {
        return [self stringByReplacingOccurrencesOfString:oldStr withString:newStr];
    }  

    //从指定的开始位置和结束位置开始截取字符串
    - (NSString *) substringFromIndex:(int)begin toIndex:(int)end
    {
        if (end <= begin) {
            return @"";
        }
        NSRange range = NSMakeRange(begin, end - begin);
        return [self substringWithRange:range];
    }  

    @end