// 声明一个数组
// 数组的元素可以是任意的对象
// 数组中装的是对象的地址
NSArray * array = [[[NSArray alloc] initWithObjects:@"one",@"two",@"three", nil] autorelease];

// 声明一个数组
// 数组的元素可以是任意的对象
// 数组中装的是对象的地址
NSArray * array = [[[NSArray alloc] initWithObjects:@"one",@"two",@"three", nil] autorelease];// 数组的遍历
// 直接打印数组的时候，会将数组的每个元素都打印出来，在数组类中重写了description方法，%@打印对象，就会获得description方法的返回值
NSLog(@"my array is %@",array);

NSEnumerator * enumerator = [array objectEnumerator];
id obj;
while(obj = [enumerator nextObject]){NSLog(@"枚举器法进行数组的遍历：%@",obj);
}

for(id obj in array){NSLog(@"foreach遍历数组元素是 ：%@",obj);
}

for(int i = 0; i < [array count];i++){NSLog(@"for方法返回的数组元素是：%@",[array objectAtIndex:i]);
}

NSMutableArray *mutableArray = [[[NSMutableArray alloc] init] autorelease];
[mutableArray addObject:@"haha"];
[mutableArray addObject:@"hoho"];
[mutableArray addObject:@"nienie"];
NSLog(@"mutableArray is %@",mutableArray);

[mutableArray removeObject:@"hoho"]; // 根据内容删除数组对象
[mutableArray removeObjectAtIndex:0]; // 根据数组下标删除对象
NSLog(@"删除后mutableArray is %@",mutableArray);

[mutableArray exchangeObjectAtIndex:0 withObjectAtIndex:1];
NSLog(@"交换位置后的mutableArray is %@",mutableArray);

NSMutableArray  *testMutableAray = [[[NSMutableArray alloc] init] autorelease];
[testMutableAray addObject:@"张三"];
[testMutableAray addObject:@"李四"];
[testMutableAray addObject:@"王五"];
[testMutableAray addObject:@"赵六"];NSEnumerator * myenumerator = [testMutableAray reverseObjectEnumerator];NSString *str;while (str = [myenumerator nextObject]) {[testMutableAray removeLastObject];
}
NSLog(@"%@",testMutableAray);

NSString * mySubstr = @"I am a poor man";
NSLog(@"原始的字符串是：%@",mySubstr);
NSArray * mySubArray = [mySubstr componentsSeparatedByString:@" "];
NSLog(@"分割后的数组是:%@",mySubArray);

// 将数组拼接成字符串
// 方法1.
NSEnumerator * mySubEnumerator = [mySubArray reverseObjectEnumerator];
NSMutableArray * subMutableArray = [[[NSMutableArray alloc] init] autorelease];
id subObj;
while (subObj = [mySubEnumerator nextObject]) {[subMutableArray addObject:subObj];NSLog(@"逆序后遍历的字符串是：%@",subObj);
}// 方法2
// componentsJoinedByString后面的“--”是字符串之间的连接符
NSString * joinedStr = [subMutableArray componentsJoinedByString:@"--"];
NSLog(@"拼接之后生成的新的数组是：%@",joinedStr);