scala特性

特性应用 (Trait App)

Scala uses a trait called "App" which is used to convert objects into feasible programs. This conversion is done using the DelayedInit and the objects are inheriting the trait named App will be using this function. This will convert the program code into a method that is inherited in main.

Scala使用称为“ App ”的特征，该特征用于将对象转换为可行的程序。 此转换使用DelayedInit完成，并且对象继承了名为App的特征，将使用此函数。 这会将程序代码转换为main中继承的方法。

Syntax:

句法：

    trait App extends DelyedInit

Let's see an example to understand the topic better,

让我们看一个例子，以更好地理解该主题，

In this example, we will use the App trait to create a program that will take arguments from the command line and print the product of them.

在此示例中，我们将使用App trait创建一个程序，该程序将从命令行获取参数并打印其乘积。

object myObject extends App 
{ 
if (args.length == 1) 
{ 
var product = {args(0).toInt}*1
println("Product is "+ product) 
} 
else if (args.length == 2) 
{ 
var product = {args(0).toInt}*{args(1).toInt}
println("Product is "+ product) 
}
else
{ 
println("Values not found.") 
} 
} 

Output

输出量

Command-line:  2 4 
Product is 8 

Here, the object with App will act as the main function and will take arguments and do the operation as required.

在这里，带有App的对象将充当主要功能，并将接受参数并根据需要执行操作。

翻译自: https://www.includehelp.com/scala/trait-app.aspx

scala特性