Question

import java.util.*; public class Test{ public sta

import java.util.*;
public class Test{
public static void main(String args[]){
Rect R = new Rect(1,2);
System.out.println(R.area());}
}
class Rect
{
double len;
double wid;
Rect(double len,double wid)
{this.len=len;this.wid=wid;}
double area()
{
return len*wid;
}
}

Answer 1

这是实例化内部类对象的问题吧？这样:
Text t=new Text();
Rect r=t.new Rect();
希望能帮到你

Answer 2

有什么问题