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 *[email protected][@"MON",@"TUE",@"WED",@"THU",@"FRI",@"SAT",@"SUN"];

//把不可变数组写入到可变数组

NSMutableArray *mutarray=[NSMutableArray arrayWithArray:arr];

[mutarray addObject:@"EIG"];

//3.根据指定下标插入元素

[mutarray insertObject:@"NINE" atIndex:5];

//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;

}