在Java中訪問靜態嵌套類的方法

Question

我已經知道靜態嵌套類應該像外層類（第2行）一樣被訪問。但即使實例化內部類直接工作（第1行）。你能幫我理解嗎？

public class OuterClass 
{ 
    public OuterClass() 
    { 
     Report rp = new Report(); // line 1 
     OuterClass.Report rp1 = new OuterClass.Report(); // line 2 
    } 

    protected static class Report() 
    { 
     public Report(){} 
    } 
} 

Answer 1

像訪問外部類

的領域，這就是你在做什麼。想象一下：

class OuterClass 
{ 
    SomeType somefield; 
    static SomeType staticField;  

    public OuterClass() 
    { 
     //works just fine. 
     somefield = new SomeType(); 
     //also works. I recommend using this 
     this.somefield = new SomeType(); 

     //the same goes for static members 
     //the "OuterClass." in this case serves the same purpose as "this." only in a static context 
     staticField = new SomeType(); 
     OuterClass.staticField = new SomeType() 
    } 
}