nsmutablearray--variable Array

main.m//oc04-task-08////Created by Keyzhang on 15-1-24.//Copyright (c) 2015 Keyzhang.    All rights reserved.//#import <Foundation/Foundation.h> #import "Person.h" int main (int argc, const char * argv[]) {                @autoreleasepool {//Insert code here .../////////////nsmutablearray--variable array///////////                Constructs a mutable array using the constructor method of the parent class nsmutablearray *arr = [Nsmutablearray array];        Nsmutablearray its own construction method, indicating the capacity size of the initialized array, note: This is just for the readability of the code nsmutablearray *ARR0 = [Nsmutablearray arraywithcapacity:2];         add Element (object)/* Inserts a given object at the end of the array.        */[Arr0 addobject:@ "1"];        [Arr0 addobject:@ "2"];        [Arr0 addobject:@ "3"];        NSLog (@ "Arr0 is%@", arr0);        Constructs Nsmutablearray *arr1 = [Nsmutablearray arraywithobjects:@ "1", @ "3", nil] with the method of the parent class;                NSLog (@ "arr1 is%@", arr1);        Adds a new element to the end of the array [arr addobject:@ "X"]; NSLog (@ "arr is%@", arr);                Insert element [arr1 insertobject:@ "2" atindex:1];        [arr1 insertobject:@ "0" atindex:0];                NSLog (@ "arr1 is%@", arr1);        Delete element//delete last element [arr1 Removelastobject];                NSLog (@ "arr1 is%@", arr1);        Delete the specified subscript element [arr1 removeobjectatindex:1];                NSLog (@ "arr1 is%@", arr1);        Delete the specified element//If the element does not exist, do nothing [arr1 removeobject:@ "2"];        NSLog (@ "arr1 is%@", arr1);        Remove all elements [arr1 removeallobjects];                        NSLog (@ "arr1 is%@", arr1);        Add multiple elements Nsmutablearray *arr2 = [Nsmutablearray arraywithobjects:@ "1", @ "2", nil];        Nsarray *lists = @[@ "3", @ "4", @ "5", @ "6"];        [Arr2 addobjectsfromarray:lists];                NSLog (@ "ARR2 is%@", arr2);        Replace and swap elements//replace the target object of the subscript with the passed-in object [arr2 replaceobjectatindex:2 withobject:@ "7"];        NSLog (@ "ARR2 is%@", arr2);        Exchange elements according to the subscript of the two elements [arr2 exchangeobjectatindex:2 withobjectatindex:5];NSLog (@ "ARR2 is%@", arr2);        Extension: Person *ps = [[Person alloc] init];        Ps.name = @ "Tom";                Ps.age = 10;        Array traversal Nsarray *ARR3 = @[@ "1", @ "2", @ "3", @ "4", @ "5", @ "6", @ "7", PS];        Traditional traversal method for (int i = 0; i < [ARR3 count]; i++) {NSLog (@ "arr3[%d] is%@", I, arr3[i]); }//Fast traversal method for (ID value in ARR3) {//loop block if ([value Ismemberofclass:[person cl                "]) {person *ps = (person *) value;                NSLog (@ "person name is%@", ps.name);            Continue                    } NSLog (@ "value is%@", value);        }//mutablecopy Nsarray *arr4 = @[@ "1", @ "2", @ "3"];        NSLog (@ "ARR4 is%@", ARR4);        Nsmutablearray *ARR5 = [Arr4 mutablecopy];        [Arr5 addobject:@ "4"];                NSLog (@ "ARR5 is%@", ARR5);            Nsmutablearray *ARR6 = [Nsmutablearray ARRAYWITHARRAY:ARR4];        } return 0;} 

nsmutablearray--variable Array