OC之【NSMutableArray的使用】

#import <Foundation/Foundation.h>
#import "Student.h"
 
void
    NSMutableArray *array = [NSMutableArrayarrayWithObject:@"1"];
    //  添加元素
addObject:@"2"];
addObject:@"3"];
     
    // [array removeObject:@"2"];
    // [array removeLastObject];
    [array removeAllObjects];
     
NSLog(@"%@", array);
}
 
 
void
    NSMutableArray *array = [[NSMutableArrayalloc] init];
    // stu1:1
Student *stu1 = [[Studentalloc] init];
age =10;
    // stu2:1
Student *stu2 = [[Studentalloc] init];
age =20;
     
    //对被添加的元素做一次retain操作，计数器+1
addObject:stu1]; // stu1:2
addObject:stu2]; // stu2:2
     
NSLog(@"add->stu1:%zi", [stu1retainCount]);
     
    //  对被删除的元素做一次release操作，计数器-1
removeObject:stu1]; // stu1:1
     
    NSLog(@"remove->stu1:%zi", [stu1retainCount]);
     
    //  释放学生
release]; // stu1:0
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
release]; // stu2:0
}
 
void
    NSMutableArray *array = [NSMutableArrayarrayWithObjects:@"1",@"2", @"3",  nil];
     
    [array replaceObjectAtIndex:1withObject:@"4"];
     
NSLog(@"%@", array);
}
 
//数组排序
void
    NSMutableArray *array = [NSMutableArrayarrayWithObjects:@"1",@"3", @"2",  nil];
     
sortUsingSelector:@selector(compare:)];
     
NSLog(@"%@", array);
}
 
int main(int argc,const char
{
 
    @autoreleasepool {
arraySort();
    }
return 0;
}