Student.h:
#import <Foundation/Foundation.h> @interface Student : NSObject @property(nonatomic,assign) int age; +(id)studentWithAge:(int)age; @end
Student.m:
#import "Student.h"
@implementation Student
+(id)studentWithAge:(int)age{
Student *stu=[[[Student alloc] init] autorelease];
stu.age=age;
return stu;
}
-(void)dealloc{
NSLog(@"Age=%i对象被释放",_age);
[super dealloc];
}
@end
main:
#import <Foundation/Foundation.h>
#import "Student.h"
void arrayCreate(){
NSMutableArray *array=[NSMutableArray arrayWithObject:@"1"];
//添加成员
[array addObject:@"2"];
[array addObject:@"3"];
//删除成员
[array removeObject:@"2"];
[array removeLastObject];
[array removeAllObjects];
NSLog(@"动态数组是：%@",array);
}
#pragma mark - 数组内存的管理
void arrayMemory(){
NSMutableArray * array=[NSMutableArray array];
Student *stu1=[Student studentWithAge:16];
Student *stu2=[Student studentWithAge:22];
//注意：array进行添加元素的时候，会对被添加的元素执行一次retain操作，计数器加1
[array addObject:stu1];//注意：执行这句话之后，首先先对stu1进行一次retain操作，计数器加1
[array addObject:stu2];
NSLog(@"addStu->计数器%i",[stu1 retainCount]);
//注意：array进行删除元素的时候，会对被删除的元素执行一次release操作，计数器减1
[array removeObject:stu1];//执行这句之后，stu1进行一次release操作，计数器减1
NSLog(@"removeStu->计数器%i",[stu1 retainCount]);
//注意：当数组被释放的时候，会对有所由成员进行一次release操作
}
#pragma mark - 替换元素
void arrayReplase(){
NSMutableArray *array=[NSMutableArray arrayWithObjects:@"1",@"2",@"3",@"4",nil]; //只能塞OC对象
//替换元素
[array replaceObjectAtIndex:1 withObject:@"8"];
Student *stu1=[Student studentWithAge:16];
[array replaceObjectAtIndex:2 withObject:stu1];//随便塞对象，可以替换一个stu对象
NSLog(@"array:%@",array);
}
#pragma mark - 排序
void arraySort(){
NSMutableArray *array=[NSMutableArray arrayWithObjects:@"1",@"4",@"3",@"2",nil]; //只能塞OC对象
NSLog(@"排序前：%@",array);
[array sortUsingSelector:@selector(compare:)];
NSLog(@"排序后：%@",array);
}
int main(int argc, const char * argv[])
{
@autoreleasepool {
/*arrayCreate();
arrayMemory();
arrayReplase();*/
arraySort();
}
return 0;
}
结果：
2013-08-02 15:32:46.883 NSMutableArray[1179:303] 排序前：(
1,
4,
3,
2
)
2013-08-02 15:32:46.885 NSMutableArray[1179:303] 排序后：(
1,
2,
3,
4
)
