OC1_数组创建

//

//  main.m

//  OC1_数组创建

//

//  Created by zhangxueming on 15/6/11.

//  Copyright (c) 2015年 zhangxueming. All rights reserved.

//



#import <Foundation/Foundation.h>

//NSArray

//创建不可变数组对象

//NSMutableArray

//创建可变数组对象



//数组中的元素都是对象可以为任意类型的对象

//数组中存储的是对象的引用(对象的地址)



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

    @autoreleasepool {

        //xcode4.0

        NSArray *array1 = @[@"one", @"two", @"three"];

        NSLog(@"array1 = %@", array1);

        

        //构造方法

        //用给定对象创建数组对象

        NSArray *array2 = [[NSArray alloc] initWithObjects:@"helloworld",[NSNumber numberWithInt:123],[NSDate date], [NSNumber numberWithFloat:3.14], nil];

        NSLog(@"array2 = %@", array2);

        

        //用其它数组创建数组对象

        NSArray *array3 = [[NSArray alloc] initWithArray:array1];

        NSLog(@"array3 = %@", array3);

        

        //NSArray *array4 = [[NSArray alloc] initWithArray:array2 copyItems:YES];//retain copy

        

        //类方法

        //创建一个空的数组对象

        NSArray *array5 = [NSArray array];

        NSLog(@"array5 = %@", array5);

        

        NSArray *array6 = [NSArray arrayWithObjects:@"one",@"two",@"three", nil];

        NSLog(@"array6 = %@", array6);

        

        NSArray *array7 = [NSArray arrayWithArray:array6];

        NSLog(@"array7 = %@", array7);

        

    }

    return 0;

}