可变数组

//NSMutableArray 可变数组   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"];

NSMutableArray *mutWeek=[NSMutableArray arrayWithArray:week];

[mutWeek addObject:@"EIG"];

//3.指定下标插入

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

//4.删除最后一个元素

[mutWeek removeLastObject];

for (id str in mutWeek) {

NSLog(@"%@",str);

}

//5.根据指定下标删除元素

[mutWeek removeObjectAtIndex:7];

//6.根据指定对象删除

[mutWeek removeObject:@"TEN"];

//7.替换指定小标元素

[mutWeek replaceObjectAtIndex:6 withObject:@"good"];

for (id str1 in mutWeek) {

NSLog(@"%@",str1);

}