#import "ViewController.h"
@interface ViewController ()
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
NSArray *array1 =[NSArray arrayWithObjects:@"wangwei",@"wangwangwei",nil];
NSArray *array2 =[NSArray arrayWithObjects:@"zhangsan",@"zhangzhang",nil];
NSDictionary *dicl =[[NSDictionary alloc]initWithObjectsAndKeys:array1,@"wang",array2,@"zhang" ,nil];
//获取字典中元素的个数
NSUInteger count =dicl.count;
NSLog(@"count:%ld",count);
NSDictionary *dicl1 = [NSDictionary dictionaryWithObject:array1 forKey:@"wang"]; //创建字典初始化一个元素
//获取字典中的所有key
NSArray *allkeys =[dicl allKeys];
NSLog(@"%@",allkeys);
//获取所有的value
NSArray *allvalue =[dicl allValues];
NSLog(@"%@",allvalue);
//通过key取value
NSArray *array3=[dicl objectForKey:@"wang"];
NSLog(@"%@",array3);
NSArray *array4 =[dicl objectForKey:@"zhang"];
NSLog(@"------------%@---------------",array4);
NSDictionary *dicl2 = @{@"wang":array1 ,@"zhang":array2}; //优化后的创建法
NSLog(@"XXXXXXXXXXXXXX%@XXXXXXXXXXXX",dicl2);
NSArray *array5 =dicl2 [@"zhang"]; //通过key取value
NSLog(@"array5= %@",dicl2);
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end
集合练习
#import "ViewController.h"
@interface ViewController ()
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional set NSSet up after loading the view, typically from a nib.
NSString *s1 [email protected]"zhangsan";
NSString *s2 [email protected]"wangwei";
//创建NSSet对象
NSSet *set1 =[[NSSet alloc]initWithObjects:s1,s2, nil];
NSSet *set2 =[NSSet setWithObjects:s1,s2,nil];
//把数组中的元素全部取出来,存到set 对象中
// NSSet *set3 =[NSSet setWithArray:<#(NSArray *)#>];
//NSSet转成数组
NSArray *array1 =[set1 allObjects];
//返回元素的个数
NSUInteger count =[set1 count];//set1.count;
//从容器中随机获取某个元素
NSString *s3 =[set1 anyObject];
//NSSet中不能存重复的对象
NSString *str [email protected]"jack";
NSArray *array2 =[NSArray arrayWithObjects:str ,str,nil];
NSLog(@"%@",array2);
NSSet *set4=[NSSet setWithObjects:str, str,nil];
NSLog(@"%@",set4);
return ;
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end
时间： 2024-11-05 11:53:34