不能访问封闭的类型实例

问题描述

我在Eclipse中编写了这个Java接口程序，但在 MyTriangle tmp = new MyTriangle（）; 下面有一个红线，当我运行程序时出现此错误：

I wrote this Java interface program in Eclipse, but there is a red line under MyTriangle tmp = new MyTriangle(); and when i run the program I get this error:

 public static void main(String[] args)
    {
     MyTriangle tmp = new MyTriangle();
     tmp.getSides();
     System.out.println();
     System.out.println("The area of the triangle is " + tmp.computeArea());
     }

interface Triangle
{
 public void triangle();
 public void iniTriangle(int side1, int side2, int side3);
 public void setSides(int side1, int side2, int side3);
 public void getSides();
 public String typeOfTriangle();
 public double computeArea();
}

 class MyTriangle implements Triangle
 {
  private int side1,side2,side3;
  public  void triangle()
  {
    this.side1 = 3;
    this.side2 = 4;
    this.side3 = 5;
  }
}

推荐答案

尝试这个。为简单起见删除了方法

Try this. Removed the methods for simplicity

public class Test1 {

    public static void main( String [] args)
    {
        MyTriangle h1 = new MyTriangle();
    }
}
class MyTriangle implements Triangle{
    int side1;
    int side2;
    int side3;

    public MyTriangle(){
        this.side1 = 1;
        this.side2 = 2;
        this.side3 = 3;
    }
}
interface Triangle{}

---

您还没有粘贴完整的代码，我认为您的代码应该如下所示。

---

You have not pasted your full code, I assume your code should look something like below.

然后您应该为主要代码创建实例在创建三角形实例之前的类，如下所示

Then you should create the Instance for your main class before creating instance for your triangle as shown below

public class Test{
     class MyTriangle
     {
      int side1,side2,side3;
      public   MyTriangle()
      {
        this.side1 = 3;
        this.side2 = 4;
        this.side3 = 5;
      }

    }
public static void main(String[] args)
    {
     MyTriangle h1 = new Test(). new MyTriangle();   // Fix is here**
     }
}

interface Triangle{}

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