OC NSMutableArray

#import <Foundation/Foundation.h>
#import "Student.h"

void arrayCreate() {
    NSMutableArray *array = [NSMutableArray arrayWithObject:@""];
    // 添加元素
    [array addObject:@""];
    [array addObject:@""];

    // [array removeObject:@"2"];
    // [array removeLastObject];
    [array removeAllObjects];

    NSLog(@"%@", array);
}

void arrayMemory() {
    NSMutableArray *array = [[NSMutableArray alloc] init];
    // stu1:1
    Student *stu1 = [[Student alloc] init];
    stu1.age = ;
    // stu2:1
    Student *stu2 = [[Student alloc] init];
    stu2.age = ;

    // 对被添加的元素做一次retain操作，计数器+1
    [array addObject:stu1]; // stu1:2
    [array addObject:stu2]; // stu2:2

    NSLog(@"add->stu1:%zi", [stu1 retainCount]);

    // 对被删除的元素做一次release操作，计数器-1
    [array removeObject:stu1]; // stu1:1

    NSLog(@"remove->stu1:%zi", [stu1 retainCount]);

    // 释放学生
    [stu1 release]; // stu1:0
    [stu2 release]; // stu2:1

    // 当数组被释放的时候，会对所有的元素都做一次release操作
    [array release]; // stu2:0
}

void arrayReplace() {
    NSMutableArray *array = [NSMutableArray arrayWithObjects:@"", @"", @"", nil];

    [array replaceObjectAtIndex: withObject:@""];

    NSLog(@"%@", array);
}

void arraySort() {
    NSMutableArray *array = [NSMutableArray arrayWithObjects:@"", @"", @"", nil];

    [array sortUsingSelector:@selector(compare:)];

    NSLog(@"%@", array);
}

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

    @autoreleasepool {
        arraySort();
    }
    return ;
}