NSMutableArray--可变数组

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////  main.m//  OC04-task-08////  Created by Xin the Great on 15-1-24.//  Copyright (c) 2015年 Xin the Great. All rights reserved.//#import <Foundation/Foundation.h>#import "Person.h"int main(int argc, const char * argv[]) {    @autoreleasepool {        // insert code here...                /////////////NSMutableArray--可变数组///////////                //使用了父类的构造方法构造一个可变数组        NSMutableArray *arr = [NSMutableArray array];                //NSMutableArray自己的构造方法,表示初始化数组的容量大小，注意：这里只是为了代码的可读性        NSMutableArray *arr0 = [NSMutableArray arrayWithCapacity:2];        //添加元素（对象）        /*         Inserts a given object at the end of the array.         */        [arr0 addObject:@"1"];        [arr0 addObject:@"2"];        [arr0 addObject:@"3"];        NSLog(@"arr0 is %@",arr0);        //用父类的方法构造        NSMutableArray *arr1 = [NSMutableArray arrayWithObjects:@"1",@"3", nil];        NSLog(@"arr1 is %@",arr1);                //向数组的末尾添加一个新元素        [arr addObject:@"x"];        NSLog(@"arr is %@", arr);                //插入元素        [arr1 insertObject:@"2" atIndex:1];        [arr1 insertObject:@"0" atIndex:0];        NSLog(@"arr1 is %@",arr1);                //删除元素        //删除最后一个元素        [arr1 removeLastObject];        NSLog(@"arr1 is %@",arr1);                //删除指定下标元素        [arr1 removeObjectAtIndex:1];        NSLog(@"arr1 is %@",arr1);                //删除指定元素 //如果元素不存在，则什么也不做        [arr1 removeObject:@"2"];        NSLog(@"arr1 is %@",arr1);        //移除所有元素        [arr1 removeAllObjects];        NSLog(@"arr1 is %@",arr1);                        //添加多个元素        NSMutableArray *arr2 = [NSMutableArray arrayWithObjects:@"1",@"2", nil];        NSArray *lists = @[@"3",@"4",@"5",@"6"];        [arr2 addObjectsFromArray:lists];        NSLog(@"arr2 is %@",arr2);                //替换和交换元素        //根据传进来的对象替换下标的目标对象        [arr2 replaceObjectAtIndex:2 withObject:@"7"];        NSLog(@"arr2 is %@",arr2);        //根据两个元素的下标交换元素        [arr2 exchangeObjectAtIndex:2 withObjectAtIndex:5];        NSLog(@"arr2 is %@",arr2);                //扩展：        Person *ps = [[Person alloc] init];        ps.name = @"tom";        ps.age = 10;                //数组的遍历        NSArray *arr3 = @[@"1",@"2",@"3",@"4",@"5",@"6",@"7",ps];        //传统遍历法        for (int i = 0; i < [arr3 count]; i++) {            NSLog(@"arr3[%d] is %@",i, arr3[i]);        }                //快速遍历法        for (id value in arr3) {            //循环块            if ([value isMemberOfClass:[Person class]]) {                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;}
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