Object-C 学习笔记(十五)---Foundation之NSArray

//
//  main.m
//  Foundation-NSArray
//
//  Created by 5016 on 13-12-11.
//  Copyright (c) 2013年 dradon. All rights reserved.
//

#import <Foundation/Foundation.h>

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

@autoreleasepool {
//不可变数组NSArray 子类:NSMutableArray (不能存放基本数据类型)
//1.单个对象初始化Array
NSArray *arr1 = [NSArray arrayWithObject:@"dragon"];
NSArray *arr2 = [NSArray arrayWithObject:[NSNumber numberWithInt:23]];//转换成为对象
NSLog(@"arr1=%@,arr2=%@",arr1,arr2);

//2.多个对象初始化Array,记住要以nil结尾
NSArray *arr3 = [NSArray arrayWithObjects:@"dragon",@"yeah",@"a",@"good",@"man",nil];
NSLog(@"arr3=%@",arr3);

//3.利用已有数组创建数组
NSArray *arr4 = [NSArray arrayWithArray:arr3];
NSArray *arr5 = [[NSArray alloc] initWithArray:arr3];
NSLog(@"arr4=%@",arr4);
NSLog(@"arr5=%@",arr5);

//4.获取数组中得元素
NSUInteger count = [arr3 count];
NSLog(@"count = %ld个元素",count);

//5.查询元素
NSLog(@"第一个元素是:%@",[arr3 objectAtIndex:1]);

//6.追加对象,返回新的数组
NSArray *arr6 = [arr5 arrayByAddingObject:@"hello"];
NSLog(@"arr6 = %@",arr6);

//7.用自定字符串 把数组连接起来拼成一个字符串 数组->字符串
NSString *str = [arr5 componentsJoinedByString:@":"];
NSLog(@"str = %@",str);

//8.判断数组是否包含某个对象
bool flag = [arr4 containsObject:@"yeah"];
NSLog(@"flag = %d",flag);

//9.查询某对象在数组中得位置
NSInteger  index = [arr3 indexOfObject:@"good"];
NSLog(@"index = %ld",index);

//10.返回最后一个对象
NSString *lastObj = [arr3 lastObject];
NSLog(@"lastObj = %@",lastObj);
}
return 0;
}