小結：
NSArray有序的集合；
NSDictionary無序的集合，可排序； 增刪改查
?
------NSArray-----------
?create :
1)NSArray *array = [NSArray arrayWithObjects:@"Henry",@"Jones", @"Susan", @"Smith", @"Patty", @"Johnson", nil];?
2)NSArray *myArray = [NSArray arrayWithArray:array];
NSLog(@"%@", myArray);?
3)?NSMutableArray *array = [[NSMutableArray alloc]?initWithObjects: @"Foo", @"Bar", @"FooBar", nil];?
4)?NSMutableArray *array2 = [NSMutableArray arrayWithCapacity: 3];
//Add an object
[array2 addObject: @"Foo"];
//Add another object
[array2 addObject: @"Bar"];
//Insert an object at a particular index
[array2 insertObject: @"FooBar" atIndex: 1];?
5)?int n = 15;
NSMutableArray *numberArray = [[NSMutableArray alloc] initWithCapacity:n];
//srand(time(0));
srandom(time(NULL));
for(int i = 0; i < n; i++)
[numberArray addObject:[NSNumber numberWithInt:arc4random()%n]];
NSLog( @"%@", numberArray);
?
sort:
NSArray *sortedArray =?
? [array sortedArrayUsingSelector:@selector(caseInsensitiveCompare:)];?
?
?
---------dictionary--------------
NSArray? *keys = [NSArray arrayWithObjects:@"key1", @"key2", @"key3", nil];
? ? NSArray *objects = [NSArray arrayWithObjects:@"How", @"are", @"you", nil];
? ? NSDictionary *dictionary = [NSDictionary dictionaryWithObjects:objects forKeys:keys];
//Case 1, loop through?
for (id key in dictionary) {
? ? ? ? NSLog(@"key: %@, value: %@", key, [dictionary objectForKey:key]);
? ? }
//Case 2, loop through?
NSEnumerator *enumerator;
? ? id key;
enumerator = [dictionary keyEnumerator]; ? ?
? ? while ((key = [enumerator nextObject])){ ?
? ? ? ? NSLog(@"%@====>%@", key, [dictionary objectForKey:key]);
? ? }
?
