#import <Foundation/Foundation.h> #import "Student.h" int main(int argc, const char * argv[]) { @autoreleasepool { Student *stu1=[[Student alloc]initWithName:@"wang" andGender:@"male" andAge:@28]; Student *stu2=[[Student alloc]initWithName:@"yang" andGender:@"female" andAge:@27]; Student *stu3=[[Student alloc]initWithName:@"lang" andGender:@"male" andAge:@26]; NSDictionary *dic1=[NSDictionary dictionaryWithObjectsAndKeys:stu1.name,@"name",stu1.gender,@"gender",stu1.age,@"age", nil]; NSDictionary *dic2=[NSDictionary dictionaryWithObjectsAndKeys:stu2.name,@"name",stu2.gender,@"gender",stu2.age,@"age", nil]; NSDictionary *dic3=[NSDictionary dictionaryWithObjectsAndKeys:stu3.name,@"name",stu3.gender,@"gender",stu3.age,@"age", nil]; NSArray *arr=[NSArray arrayWithObjects:dic1,dic2,dic3, nil]; [Student displayFirstAndLastName:arr]; [Student caculateFirstAndLastAge:arr]; } return 0; }
.h
#import <Foundation/Foundation.h> @interface Student : NSObject -(instancetype)initWithName:(NSString *)newName andGender:(NSString *)newGender andAge:(NSNumber *)newAge; +(void)displayFirstAndLastName:(NSArray *)array; +(void)caculateFirstAndLastAge:(NSArray *)array; @property NSString *name; @property NSString *gender; @property NSNumber *age; @end
.m
#import "Student.h" @implementation Student -(instancetype)initWithName:(NSString *)newName andGender:(NSString *)newGender andAge:(NSNumber *)newAge { name=newName; gender=newGender; age=newAge; return self; } +(void)displayFirstAndLastName:(NSArray *)array { NSDictionary *dicFirst=[array firstObject]; NSDictionary *dicLast=[array lastObject]; NSLog(@"first name:%@,last name:%@",dicFirst[@"name"],dicLast[@"name"]); } +(void)caculateFirstAndLastAge:(NSArray *)array { NSDictionary *dicFirst=[array firstObject]; NSDictionary *dicLast=[array lastObject]; int firstAge=[dicFirst[@"age"] intValue]; int lastAge=[dicLast[@"age"] intValue]; NSLog(@"Age between first and last:%d",abs(firstAge-lastAge)); } @synthesize name,gender,age; @end