OC3_Copy及MultableCopy

//

//  main.m

//  OC3_Copy及MultableCopy

//

//  Created by zhangxueming on 15/6/19.

//  Copyright (c) 2015年 zhangxueming. All rights reserved.

//



#import <Foundation/Foundation.h>

//copy mutableCopy

int main(int argc, const char * argv[]) {

    @autoreleasepool {

        //copy 把可变对象及不可变对象 copy生成不可变对象

        NSString *str = @"hello world";

        NSString *str1 = [str copy];

        //[str1 insertString:@"qianfeng" atIndex:4];

        NSLog(@"str = %p str1 = %p", str, str1);

        NSLog(@"str1 = %@", str1);

        

        NSMutableString *str2 = [NSMutableString stringWithString:@"hello world"];

        NSString *str3 = [str2 copy];

        //[str3 insertString:@"qianfeng" atIndex:4];

        NSLog(@"str3 = %@", str3);

        

        //mutableCopy 把可变或者不可变对象copy生成可变对象

        

        NSString *str4 = @"qianfeng";

        NSMutableString *str5 = [str4 mutableCopy];

        [str5 insertString:@"hello" atIndex:4];

        NSLog(@"str5 = %@", str5);

        

        NSMutableString *str6 = [NSMutableString stringWithString:@"qianfeng"];

        NSMutableString *str7 = [str6 mutableCopy];

        [str7 insertString:@"world" atIndex:4];

        NSLog(@"str7 = %@", str7);

        

    }

    return 0;

}