intarrayLength = [array1count]; //访问数组中特定位置的一个对象 NSString*string = [array1objectAtIndex:0]; //是否包含指定对象 BOOLisInArray = [array1containsObject:string1]; //对象在数组中的位置 intindex = [array1indexOfObject:string1];
NSArray *array=[NSArray arrayWithObjects:stu1,stu2,stu3, nil]; //让数组里的元素调用addMessage方法 [array makeObjectsPerformSelector:@selector(addMessage:) withObject:@"你好。"]; } #pragma mark 数组遍历(四种方法) void arrayLoop(){ Student *stu1=[Student student]; NSArray *array=[NSArra...
在Object C也提供了类似C#中的Array数组对象,在Object C中使用NSArray 来创建数组;但是在Object C中NSArray 只能存放对象类型的指针,不能存放int,char,double等基本数据类型。 一. 不可变数组对象 这个和之前的NSString有些类似,NSArray 能够创建不可变的数组对象。一旦初始化这个对象就不能动态的修改和增加这个数组。
数组”（array）和“对象”（object）两者的区别 数组”(array)和“对象”(object)两者都可以⽤来表⽰数据的集合。⽐如有⼀个数组a=[1,2,3,4]，还有⼀个对象a={0:1,1:2,2:3,3:4}，然后你运⾏alert(a[1])，两种情况下的运⾏结果是相同的！这就是说，数据集合既可以⽤数组表⽰，也...
If you have any questions during development, post them on the Issues page of GitHub.This API lists some or all of the object versions in a bucket. You can use parameters
步骤一:创建 JSONArray 对象 在开始遍历数组之前,我们需要先创建一个空的 JSONArray 对象。使用如下代码创建: JSONArrayjsonArray=newJSONArray(); 1. 这行代码将创建一个空的 JSONArray 对象,用于存储数组中的元素。 步骤二:遍历数组中的每个元素 接下来我们需要遍历数组中的每个元素,根据数组的类型选择不同的遍...
c(5) = InitHandleArray(3); z = [c.Num] z = -4 -4 -4 -4 3 Create an Object Array in the Constructor You can also use the class constructor itself to create and return an object array. For example, theObjectArrayclass creates an object array that is the same size and shape as...
For each own property key P of O such that P is an array index, in ascending numeric index order, do a. Add P as the last element of keys. For each own property key P of O such that Type(P) is String and P is not an array index, in ascending chronological order of property ...
really large). If the elements of an array are reference-rich, the cost is high. If the element doesn't contain any references, I wouldn't need to go through the array at all. For example, if you use an array to store nodes in a binary tree, one way to implement it is to ...
Object initializers can set indexers, in addition to assigning fields and properties. Consider this basicMatrixclass: C# publicclassMatrix{privatedouble[,] storage =newdouble[3,3];publicdoublethis[introw,intcolumn] {// The embedded array will throw out of range exceptions as appropriate.get{ret...