strong与weak

@interface ViewController : UIViewController

@property(nonatomic,strong)NSString*name1;

@property(nonatomic,strong)NSString*name2;

@property(nonatomic,strong)NSString*name11;

@property(nonatomic,strong)NSString*name22;

@end

@synthesize name1,name2,name11,name22;

    self.view.backgroundColor=[UIColor whiteColor];

    name1 = [[NSString alloc] initWithUTF8String:"鱼儿飞1"];

    name2=name1;

    name1=nil;

    NSLog(@"name2=%@",name2);

    

    

//    name11 = [[NSString alloc] initWithFormat:@"鱼儿飞2"];//OC中的字符串为对象，

    name11 = [[NSString alloc] initWithUTF8String:"鱼儿飞2"];//C语言中的字符串为字符指针

    name22=name11;

    name11=nil;

    NSLog(@"name22=%@",name22);