Object-C中的字符串对象1-不可变字符串

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#import <Foundation/Foundation.h>int main(int argc, const char * argv[]){        @autoreleasepool {                NSString *str1=@"this is string A";        NSString *str2=@"this is string B";        NSString *temp;        NSComparisonResult compareResult;                //01.计算字符串中字符个数        NSLog(@"字符串长度：%@的长度为%lu",str1,[str1 length]);                //02.将一个字符串复制到另一字符串        temp=[NSString stringWithString:str1];        NSLog(@"字符串复制：%@",temp);                //03.将一个字符串复制到另一字符串末尾        temp=[str1 stringByAppendingString:str2];        NSLog(@"字符串拼接：%@",temp);                //04.验证两个字符串是否相等        if([str1 isEqualToString:str2])        {            NSLog(@"字符串比较：%@与%@相同",str1,str2);        }        else        {            NSLog(@"字符串比较：%@与%@不相同",str1,str2);        }                //05.验证一个字符串是否小于，等于或大于另一字符串        compareResult=[str1 compare:str2];        if(compareResult==NSOrderedAscending){NSLog(@"字符串比较：%@<%@",str1,str2);}        else if(compareResult==NSOrderedSame){NSLog(@"字符串比较：%@=%@",str1,str2);}        else{NSLog(@"字符串比较：%@>%@",str1,str2);}                //06.将字符串转为大写        temp=[str1 uppercaseString];        NSLog(@"字符串大写：%@",temp);                //07.将字符串转为小写        temp=[str1 lowercaseString];        NSLog(@"字符串小写：%@",temp);                //08.从字符串中取前3个字符        temp=[str1 substringToIndex:3];        NSLog(@"字符串截取：%@",temp);                //09.从字符串中截取第5个字符以后的字符        temp=[str1 substringFromIndex:5];        NSLog(@"字符串截取：%@",temp);                //10.截取从索引5到索引13的子字符        temp=[[str1 substringFromIndex:5]substringToIndex:8];        NSLog(@"字符串截取：%@",temp);                temp=[str1 substringWithRange:NSMakeRange(5, 8)];        NSLog(@"字符串截取：%@",temp);                //11.从另一字符串查找一个字符串        NSString *subStr=@"string A";        NSRange subRange=[str1 rangeOfString:subStr];        NSLog(@"字符串查找：%@位于%@第:%lu个字符，长度为:%lu",subStr,str1,subRange. location,subRange .length);                        subRange=[str2 rangeOfString:subStr];        if(subRange.location==NSNotFound)        {            NSLog(@"字符串查找：%@中不存在%@",str2,subStr);        }        else        {            NSLog(@"字符串查找：%@中存在%@",str2,subStr);        }            }    return 0;}

输出结果：

2014-02-12 22:41:43.890 05.字符串[1560:303]字符串长度：this is string A的长度为16

2014-02-12 22:41:43.892 05.字符串[1560:303]字符串复制：this is string A

2014-02-12 22:41:43.892 05.字符串[1560:303]字符串拼接：this is string Athis is string B

2014-02-12 22:41:43.892 05.字符串[1560:303]字符串比较：this is string A与this is string B不相同

2014-02-12 22:41:43.893 05.字符串[1560:303]字符串比较：this is string A<this is string B

2014-02-12 22:41:43.893 05.字符串[1560:303]字符串大写：THIS IS STRING A

2014-02-12 22:41:43.893 05.字符串[1560:303]字符串小写：this is string a

2014-02-12 22:41:43.893 05.字符串[1560:303]字符串截取：thi

2014-02-12 22:41:43.894 05.字符串[1560:303]字符串截取：is string A

2014-02-12 22:41:43.894 05.字符串[1560:303]字符串截取：is strin

2014-02-12 22:41:43.895 05.字符串[1560:303]字符串查找：string A位于this is string A第:8个字符，长度为:8

2014-02-12 22:41:43.895 05.字符串[1560:303]字符串查找：this is string B中不存在string A

Program ended with exit code: 0

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