oc-可变数组继承不可变数组

 

#import <Foundation/Foundation.h>

 

int main(int argc, const char * argv[]) {

    @autoreleasepool {

        //可变数组继承不可变数组

        //1.创建  设定元素个数进行创建

        NSMutableArray *mutArr=[NSMutableArray arrayWithCapacity:7];

        //2.向数组中添加一个元素

        NSArray *arr=@[@"MON",@"TUE",@"WED",@"THU",@"FRI",@"SAT",@"SUN"];

        NSMutableArray *mutarray=[NSMutableArray arrayWithArray:arr];

        [mutarray addObject:@"EIG"];

        //3.根据指定下标插入元素

        [mutarray insertObject:@"NINE" atIndex:8];

        //4.删除最后一个元素

        [mutarray removeLastObject];

        //5.根据指定下标删除元素

        [mutarray removeObjectAtIndex:7];

        //6.根据指定对象进行删除

        [mutarray removeObject:@"SUN"];

        //7.替换指定下标的元素

        [mutarray replaceObjectAtIndex:0 withObject:@"SUN"];

        

        

        for (id str in mutarray) {

            NSLog(@"%@",str);

        }

    }

    return 0;

}