Java，这是声明吗？

Question

public void sendMessage(View view){
//todo
}

View view 是否正在声明(给一个名称 ( "view")？)类 View？所以可以稍后初始化(view = new View();)?

Answer 1

不，这意味着调用函数时 View 将作为参数传递。

例如:

public int sum (int num1, int num2){
    return num1+num2;
}

现在你可以这样调用它:

System.out.printn(sum(1,2));

这将打印 3。

在您的情况下，where 将调用函数 sendMessage。你会这样做

View view= new view();
sendMessage(view);

编辑:

public void sendMessage(View view){
    // Here you can use view as if it is already set you don't need to create a new view.
   // Example you might want some attributes from view to send message.
   System.out.println("View name" + view.getName());
   System.out.println("View id" + view.getId());
   // Note this is just an example. you can use attributes from view in here.
}