objective-c之日期时间和异常处理

//
//  main.m
//  日期时间和异常处理
//
//  Created by wu jianhua on 16-8-3.
//  Copyright (c) 2016年 wujianhua. All rights reserved.
//

#import <Foundation/Foundation.h>

void testDate()
{
    NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];

    NSDate *date= [NSDate date];//静态方法
    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc]init];
    [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
    NSString *dateString = [dateFormatter stringFromDate:date];
    NSLog(@"Current date is %@",dateString);
    NSDate *newDate = [dateFormatter dateFromString:dateString];
    NSLog(@"NewDate: %@",newDate);

    NSString *nowtime = [dateFormatter stringFromDate:[NSDate date]];

    NSLog(@"nowtime=%@",nowtime);

    [pool drain];

}

void testException()
{
    NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
    NSMutableArray *array = [[NSMutableArray alloc]init];
    @try
    {
        NSString *string = [array objectAtIndex:10];//数组越界异常
    }
    @catch (NSException *exception)
    {
        NSLog(@"%@ ",exception.name);
        NSLog(@"Reason=%@ ",exception.reason);
    }
    @finally
    {
        NSLog(@"@@finaly Always Executes");
    }
    [pool drain];

}

int main(int argc, const char * argv[])
{


    testDate();

    testException();

    return 0;
}