//

//  main.m

//  NSArray是不可变的，一旦初始化完毕，就不能添加和删除了。类似于NSString和NSMutilString。

#import <Foundation/Foundation.h>

#import "Person.h"

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

    NSArray *arr1 = [[NSArray alloc] init]; //NSArray是不可变的，这样创建空的数组，以后又不能修改，所以这是没用的。

    NSArray *arr2 = [NSArray arrayWithObject:@"lnj"];

    // 数组中的nil是结束符

    NSArray *arr3 = [NSArray arrayWithObjects:@"lnj", @"lmj" ,@"jjj", @"cp", nil];

    NSLog(@"%@", arr3);//(lnj,lmj,jjj,cp),圆括号就是数组。

    Person *p  = [Person new];

    NSObject *obj = [NSObject new];

    //+ (instancetype)arrayWithObjects:(ObjectType)firstObj, ... NS_REQUIRES_NIL_TERMINATION;  ...表示是可变参数。

    NSArray *arr4 = [NSArray arrayWithObjects:p, obj, @"lnj", nil];//nil是一个结束符

    NSLog(@"arr = %@", arr4);//("<Person: 0x100304790>","<NSObject: 0x1007003b0>",lnj)

    NSLog(@"count = %lu", [arr4 count]);//

    NSLog(@"last = %@", [arr4 lastObject]);//lnj

    NSLog(@"first = %@", [arr4 firstObject]);//<Person: 0x100304790>

    NSLog(@"arr[1] = %@", [arr4 objectAtIndex:]);//<NSObject: 0x1007003b0>

    NSArray *arr5 = [NSArray arrayWithObjects:@"lnj", @"lmj", @"jjj", @"zs", nil];

    if([arr5 containsObject:@"zs"])

    {

        NSLog(@"arr中包含zs");

    }else

    {

        NSLog(@"arr中不包含zs");

    }

    // 创建数组简写

    NSString *str = @"lnj";

    NSArray *arr6 = [NSArray arrayWithObjects:@"lnj", @"lmj", @"jjj", nil];

    NSArray *arr7 = @[@"lnj", @"lmj", @"jjj"];

    // 获取数组元素的简写

    NSLog(@"%@", [arr7 objectAtIndex:]);

    NSLog(@"%@", arr7[]);

    return ;

}