//  Person.h
//  XcodePRJ01
//
//  Created by YuePr on 15/12/10.
//  Copyright © 2015年 CHINASof. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface Person : NSObject
{
    @protected
   NSString *_name;

}
@property NSString *name;
@property NSString *sex;

-(id)initForPerson:(NSString *)name;
@end
//  Person.m
//  XcodePRJ01
//
//  Created by YuePr on 15/12/10.
//  Copyright © 2015年 CHINASof. All rights reserved.
//

#import "Person.h"

@implementation Person

-(id)initForPerson:(NSString *)name
{
    if(self = [super init])
    {
        _name = @"Lin Feng ";
        
    }
    return self;
}


@end
//  Police.h
//  XcodePRJ01
//
//  Created by YuePr on 15/12/10.
//  Copyright © 2015年 CHINASof. All rights reserved.
//

#import "Person.h"

@interface Police : Person
{
// @protected
   
    NSString *_policeType;
    int _policeId;


}

@property NSString *policeType;
@property int policeId;

-(void)setPoliceId:(int)policeId;
-(int)policeId;
-(void)setName:(NSString *)name;
-(NSString*)name;

-(id)initForPolicePoliceType :(NSString *)policeType  andpoliceId:(int)policeid;

@end
//  Police.m
//  XcodePRJ01
//
//  Created by YuePr on 15/12/10.
//  Copyright © 2015年 CHINASof. All rights reserved.
//

#import "Police.h"

@implementation Police

-(id)initForPolicePoliceType :(NSString *)policeType  andpoliceId:(int)policeid
{

    if( self =[super initForPerson:@"dadaf"])
    {
        _policeType =  policeType;
        
        _policeId = policeid;
    }
   
    return  self;
}
-(void)setName:(NSString *)name
{
    _name = name;
}
-(NSString*)name
{
    NSLog(@"*************");
    return _name;
}

-(void)setPoliceId:(int)policeId
{
    _policeId = policeId;

}
-(int)policeId
{
    NSLog(@"***8282222222");
    return _policeId;
}@end
//  main.m
//  多态与构造方法
//
//  Created by YuePr on 15/12/10.
//  Copyright © 2015年 CHINASof. All rights reserved.
//#import <Foundation/Foundation.h>
#import "Person.h"
#import "Police.h"
int main(int argc, const char * argv[]) {
    @autoreleasepool {
    Person * per1 = [[Person alloc] initForPerson:@"林峰"];
    NSLog(@"%@",per1.name);
    Police *policeM = [[Police alloc] initForPolicePoliceType:@"trafficPOlice" andpoliceId:1008];
    NSLog(@"POLICEtype ID IS   %@,  ID IS  %d",policeM.policeType,policeM.policeId);
    NSLog(@"*****%@",policeM.name);
    NSLog(@"%d",policeM.policeId);
    }
    return 0;
}

注意：init方法重写的时候，(id)initForPerson     此方法自init之后的第一个单词首字母必须大写，否则编译器会当作异常错误提示。