OC之【NSMutableDictionary的使用】

main.m文件
#import <Foundation/Foundation.h>
#import "Student.h"
 
可变字典的使用
void
    //创建一个空的字典
    NSMutableDictionary *dict = [NSMutableDictionarydictionary];
Student *stu1 = [StudentstudentWithName:@"stu1"];
Student *stu2= [StudentstudentWithName:@"stu2"];
     
    //  添加元素
    // stu1的计数器会+1
setObject:stu1 forKey:@"k1"];
NSLog(@"stu1:%zi", [stu1retainCount]);
     
    //  添加其他字典other到当前字典dict中
    NSDictionary *other = [NSDictionarydictionaryWithObject:@"v2"forKey:@"k2"];
    [dict addEntriesFromDictionary:other];
     
    //删除所有的键值对
    // [dict removeAllObjects];
     
    //  删除k1对应的元素stu1，stu1会做一次release操作
    [dict removeObjectForKey:@"k1"];
NSLog(@"stu1:%zi", [stu1retainCount]);
     
    //  删除多个key对应的value
    // [dict removeObjectsForKeys:[NSArray arrayWithObject:@"k1"]];
     
    //  字典被销毁时，内部的所有key和value计数器都会-1，也就是说stu1会release一次
}
 
int main(int argc,const char
{
 
    @autoreleasepool {
dictUse();
    }
return 0;
}