Set-Dictionary Method exercises

-(Void) viewdidload {

[Super viewdidload];

// Initialize a dictionary object with one or more key-value pairs in the order of values, keys, values, keys, keys,..., and nil

Nsdictionary * dict = [[nsdictionary alloc] initwithobjectsandkeys: @ 1, @ "key1", @ 2, @ "key2", @ 3, @ "key3", nil];

Nslog (@ "dict: % @", dict );

// Use two arrays to initialize a dictionary (one key array and one value array, which must be of the same size; otherwise, the dictionary will crash.

Nsarray * valuearray = @ [@ "1", @ "2", @ "3"];

Nsarray * keyarray = @ [@ "key1", @ "key2", @ "key"];

Nsdictionary * dict2 = [[nsdictionary alloc] initwithobjects: valuearray forkeys: keyarray];

Nslog (@ "dict: % @", dict2 );

Nsdictionary * dict3 = [[nsdictionary alloc] initwithdictionary: dict];

Nslog (@ "dict: % @", dict3 );

// Save the dictionary object content to the file

Nsstring * Path = @ "/users/Apple/desktop/dict. plist ";

[Dict writetofile: path atomically: Yes];

// Read data from the previously saved file to the dictionary object

Nsdictionary * dict4 = [nsdictionary dictionarywithcontentsoffile: path];

Nslog (@ "dict4: % @", dict4 );

// You can initialize a literal constant like an immutable dictionary. The key is in the front and the value is in the back.

Nsdictionary * dict5 =@ {@ "key": @ 1, @ "key1": @ 2, @ "key3": @ 3 };

Nslog (@ "dict5: % @", dict5 );

// Obtain the corresponding object using the specified key. If this key is not found, Nil is returned.

Nsnumber * num = [dict objectforkey: @ "key"];

Nslog (@ "Num: % @", num );

// Obtain the number of key-value pairs in the dictionary.

Nsinteger paircount = [dict count];

Nslog (@ "paircount: % d", paircount );

Nsarray * allkeys = [dict allkeys];

Nsarray * allvalues = [dict allvalues];

Nslog (@ "allkeys: % @", allkeys );

Nslog (@ "allvalue: % @", allvalues );

// Old Traversal method

Nsarray * allkeys2 = [dict2 allkeys];

Nsuinteger COUNT = [allkeys2 count];

For (INT I = 0; I <count; I ++ ){

ID key = [allkeys2 objectatindex: I];

ID value = [dict2 objectforkey: Key];

Nslog (@ "% @: % @", key, value );

}

// Quick Enumeration

For (ID key in dict2 ){

ID value = [dict objectforkey: Key];

Nslog (@ "% @: % @", key, value );

}

// Immutable dictionary object

Nsmutabledictionary * mdict = [[nsmutabledictionary alloc] initwithobjectsandkeys: @ 1, @ "key", @ 2, @ "key2", nil];

// Delete a key-Value

[Mdict removeobjectforkey: @ "key"];

Nslog (@ "mdict: % @", mdict );

// Add a key-Value

[Mdict setobject: @ 3 forkey: @ "key3"];

Nslog (@ "mdict: % @", mdict );

Nsmutabledictionary * mdict2 = [[nsmutabledictionary alloc] initwithobjectsandkeys: @ 1, @ "key4", @ 2, @ "key4", @ 3, @ "key5", nil];

// Add the key-value in a dictionary object to another dictionary object

[Mdict2 addentriesfromdictionary: mdict];

Nslog (@ "mdcit2: % @", mdict2 );

[Mdict removeallobjects];

Nslog (@ "mdict: % @", mdict );

Nsmutabledictionary * mdict3 = [[nsmutabledictionary alloc] initwithobjectsandkeys: @ 1, @ "key3", @ 2, @ "key4", @ 3, @ "key5", nil];

Nsmutabledictionary * mdict4 = [[nsmutabledictionary alloc] initwithobjectsandkeys: Nil];

[Mdict4 setdictionary: mdict3];

Nslog (@ "mdict4: % @", mdict4 );

Nsarray * array = @ [@ "key4", @ 2, @ "key4", @ 3, @ "key5"];

[Mdict3 removeobjectsforkeys: array];

// Set

Nsset * Set = [[nsset alloc] initwithobjects: @ 1, @ 2, @ 3, nil];

Nsset * set2 = [[nsset alloc] initwithobjects: @ 3, @ 4, @ 5, nil];

// Randomly retrieve an element

Nsnumber * num2 = [set anyobject];

Nslog (@ "num2: % @", num2 );

// Determine whether the set contains an element

Bool B = [set containsobject: @ 1];

Nslog (@ "% HHD", B );

// Determine whether two sets have an intersection

Bool a = [set intersectsset: set2];

Nslog (@ "% HHD", );

// Determine whether the two sets are equal

Bool c = [set isequaltoset: Set];

Nslog (@ "% HHD", C );

// Determine whether a set is a subset of Two Sets

Bool d = [set issubsetofset: set2];

Nslog (@ "% HHD", d );

// Immutable set

Nsmutableset * mset = [[nsmutableset alloc] initwithobjects: @ 1, @ 2, @ 3, nil];

Nsmutableset * mset2 = [[nsmutableset alloc] initwithobjects: @ 2, @ 3, nil];

// [Mset intersectsset: mset2];

// [Mset addobject: @ 4];

// [Mset removeobject: @ 4];

// Nsarray * array3 = @ [@ 4, @ 5];

// [Mset addobjectsfromarray: array3];

// [Mset minusset: mset2];

// [Mset removeallobjects];

[Mset unionset: mset2];

Nslog (@ "% @", mset );

 

 

}