Basic usage of Nsarray and Nsmutablearray in Objective-c

/*---------------------Nsarray---------------------------*/

//Create an array

Nsarray *array1 = [Nsarray arraywithobject:@"1"];

Nsarray *array2 = [Nsarray arraywithobjects:@"1", @"2", @"3", nil];

Nsarray *array3 = [Nsarray arraywitharray:array2];

NSLog (@"array1 =%@", array1);

NSLog (@"array2 =%@", array2);

NSLog (@"array3 =%@", array3);

//Get the number of data in the array

int count = [array2 count];

NSLog (@"array2 size is%d", count);

//access to data within an array

NSString *str1 = [Array2 objectatindex:0];

NSLog (@"array2 first content is%@", str1);

//array in which data is inserted to return a new array

Nsarray *array4 = [array3 arraybyaddingobject:@"4"];

NSLog (@"Array4 =%@", array4);

//data in array to make a character connection

NSString *STR2 = [Array4 componentsjoinedbystring:@","];

NSLog (@"str2 =%@", str2);

//Determine if an object is contained in an array

BOOL B1 = [Array4 containsobject:@"4"];

BOOL b2 = [Array4 containsobject:@"5"];

NSLog (@"B1 =%d,b2 =%d", b1,b2);

//Take an index of the object within the array

int index = [array4 indexofobject:@"4"];

NSLog (@"index =%d", index);

NSString *STR3 = [Array4 lastobject];

NSLog (@"Array4 last object is%@", STR3);

/ *-----------------------variable array nsmutablearray-----------------------------------------* /

//Initialize array specifies array length but variable

Nsmutablearray *marray1 = [Nsmutablearray arraywithcapacity:5];

//Add elements to an array

[MArray1 addobject:@"AAAA"];

[MArray1 addobject:@"CCCC"];

NSLog (@"mArray1 =%@", mArray1);

//Inserts an element into the specified position

[MArray1 insertobject:@"bbbb" atindex:1];

[MArray1 insertobject:@"dddd" atindex:[marray1 Count]];

[MArray1 insertobject:@"eeee" atindex:[marray1 Count]];

NSLog (@"mArray1 =%@", mArray1);

//removing elements

[MArray1 removeobject:@"Eeee"];

NSLog (@"mArray1 =%@", mArray1);

[MArray1 removeobjectatindex:[marray1 count]-1];

NSLog (@"mArray1 =%@", mArray1);

Nsarray *array5 = [Nsarray arraywithobjects:@"bbbb", @"CCCC", nil];

[MArray1 Removeobjectsinarray:array5];

NSLog (@"mArray1 =%@", mArray1);

//Insert an array into an array

Nsmutablearray *marray2 = [Nsmutablearray arraywithobjects:@"AAAA", @"AAAA", nil];

[MArray2 addobject:@"bbbb"];

NSLog (@"mArray2 =%@", mArray2);

[MArray2 Addobjectsfromarray:array4];

NSLog (@"mArray2 =%@", mArray2);

//Replace element

[MArray2 replaceobjectatindex:[marray2 count]-1 withobject:@"5"];

NSLog (@"mArray2 =%@", mArray2);

//Traversal Array General method: Low Performance

Nsarray *array6 = [Nsarray arraywithobjects:@"A", @"B", @"C", @"D", @"E", nil];

int len = [Array6 count];

For (int i=0; i<len; i++) {

NSString *value = [Array6 objectatindex:i];

NSLog (@"Array6%d content is%@", i,value);

}

//enumeration traversal equivalent to enhanced for loop in Java

For (NSString *string in Array6) {

NSLog (@"Array6 content is%@", string);

}

NSLog (@"-----------------------");

//When the array element type is not determined

For (ID string in array6) {

NSLog (@"Array6 content is%@", string);

}

Basic usage of Nsarray and Nsmutablearray in Objective-c