No enclosing instance of type is accessible

This question already has an answer here:

Java inner class and static nested class 23 answers

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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{}

---

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

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{}

---

MyTriangle is a non-static inner class. That means like all other instance members it (& it's instance) belongs to an instance of the outer class as opposed to the class itself. Remember to belong to a class things need to be defined as static .

Hence, you need to provide an outer class instance to instantiate the inner one as

new OuterClass().new MyTriangle();

If you mark the inner class static which makes it nested it would allow you to refer to it in a static context like a public static main() method.

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