OC班级类

//
//  MyClass.h
//  OC2_班级类
//
//  Created by zhangxueming on 15/6/12.
//  Copyright (c) 2015年 zhangxueming. All rights reserved.
//

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

@interface MyClass : NSObject
{
    NSString * _className;
    NSMutableArray * _stuList;
}

- (id)initWithClassName:(NSString *)name;
- (void)setClassName:(NSString *)name;
- (NSString*)className;
- (void)addStudent:(Student *)student;
- (void)addStudent:(Student *)student atIndex:(NSInteger) index;
- (void)removeStudent:(Student *)student;
- (void)removeStudentAtIndex:(NSInteger) index;
- (void)replaceStudent:(Student *)student atIndex:(NSInteger) index;
- (void)showStuList;
- (void)sortedByNumber;//按照学号升序
- (void)sortedByScore;//按照分数降序
- (void)sortedByName;//按照名字降序

+ (void)testMyClass;

@end

//
//  MyClass.m
//  OC2_班级类
//
//  Created by zhangxueming on 15/6/12.
//  Copyright (c) 2015年 zhangxueming. All rights reserved.
//

#import "MyClass.h"

@implementation MyClass

- (id)initWithClassName:(NSString *)name
{
    if (self = [super init]) {
        _className = name;
        _stuList = [NSMutableArray array];
    }
    return self;
}
- (void)setClassName:(NSString *)name
{
    _className = name;
}

- (NSString*)className
{
    return _className;
}

- (void)addStudent:(Student *)student
{
    if (![_stuList containsObject:student]) {
        [_stuList addObject:student];
    }
}

- (void)addStudent:(Student *)student atIndex:(NSInteger) index
{
    [_stuList insertObject:student atIndex:index];
}

- (void)removeStudent:(Student *)student
{
    [_stuList removeObject:student];
}

- (void)removeStudentAtIndex:(NSInteger) index
{
    [_stuList removeObjectAtIndex:index];
}

- (void)replaceStudent:(Student *)student atIndex:(NSInteger) index
{
    [_stuList replaceObjectAtIndex:index withObject:student];
}

//遍历学生数组
- (void)showStuList
{
    for (Student *stu in _stuList) {
        [stu printStudent];
    }
}

- (void)sortedByNumber//按照学号升序
{
    [_stuList sortUsingSelector:@selector(isSortByNum:)];
}
- (void)sortedByScore//按照分数降序
{
    [_stuList sortUsingSelector:@selector(isSortByScore:)];
}
- (void)sortedByName//按照名字降序
{
    [_stuList sortUsingSelector:@selector(isSortByName:)];
}

+ (void)testMyClass
{
    MyClass *ios1509 = [[MyClass alloc] initWithClassName:@"ios1509"];
    for  (NSInteger i=0; i<10; i++) {
        Student *stu = [[Student alloc] initWithName:[NSString stringWithFormat:@"name%d", arc4random()%50+1] number:arc4random()%100+1 score:arc4random()%101];
        [ios1509 addStudent:stu];
    }
    NSLog(@"排序前");
    [ios1509 showStuList];

    NSLog(@"分数排序后");
    [ios1509 sortedByScore];
    [ios1509 showStuList];

    NSLog(@"学号排序后");
    [ios1509 sortedByNumber];
    [ios1509 showStuList];

    NSLog(@"名字排序后");
    [ios1509 sortedByName];
    [ios1509 showStuList];
}

@end

//
//  Student.h
//  OC2_班级类
//
//  Created by zhangxueming on 15/6/12.
//  Copyright (c) 2015年 zhangxueming. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface Student : NSObject
{
    NSString * _name;
    NSInteger _num;
    NSInteger _score;
}

- (id)initWithName:(NSString *)name number:(NSInteger)num score:(NSInteger)score;
- (void)setName:(NSString *)name;
- (NSString *)name;
- (void)setNum:(NSInteger)num;
- (NSInteger)num;
- (void)setScore:(NSInteger)score;
- (NSInteger)score;

- (BOOL)isSortByScore:(Student *)aStudent;
- (BOOL)isSortByNum:(Student *)aStudent;
- (NSComparisonResult)isSortByName:(Student *)aStudent;

- (void)printStudent;

@end

//
//  Student.m
//  OC2_班级类
//
//  Created by zhangxueming on 15/6/12.
//  Copyright (c) 2015年 zhangxueming. All rights reserved.
//

#import "Student.h"

@implementation Student

- (id)initWithName:(NSString *)name number:(NSInteger)num score:(NSInteger)score
{
    if(self = [super init])
    {
        _name = name;
        _num = num;
        _score = score;
    }
    return self;
}
- (void)setName:(NSString *)name
{
    _name = name;
}

- (NSString *)name
{
    return _name;
}

- (void)setNum:(NSInteger)num
{
    _num = num;
}

- (NSInteger)num
{
    return _num;
}

- (void)setScore:(NSInteger)score
{
    _score = score;
}

- (NSInteger)score
{
    return _score;
}

- (BOOL)isSortByScore:(Student *)aStudent
{
    if ([self score]>[aStudent score]) {
        return YES;
    }
    return NO;
}

- (BOOL)isSortByNum:(Student *)aStudent
{
    if ([self num] > [aStudent num]) {
        return YES;
    }
    return NO;
}

- (NSComparisonResult)isSortByName:(Student *)aStudent
{
    return [[self name] compare:[aStudent name]];
}

- (void)printStudent
{
    NSLog(@"name = %@ num = %li score = %li", [self name], [self num], [self score]);
}

@end

//
//  main.m
//  OC2_班级类
//
//  Created by zhangxueming on 15/6/12.
//  Copyright (c) 2015年 zhangxueming. All rights reserved.
//

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

int main(int argc, const char * argv[]) {
    @autoreleasepool {
        // insert code here...
        //NSLog(@"Hello, World!");
        [MyClass testMyClass];
    }
    return 0;
}