Cannot instantiate the type ошибка

import java.io.*;
import java.util.*;

public class TwoColor
{
    public static void main(String[] args) 
    {
         Queue<Edge> theQueue = new Queue<Edge>();
    }

    public class Edge
    {
        //u and v are the vertices that make up this edge.
        private int u;
        private int v;

        //Constructor method
        public Edge(int newu, int newv)
        {
            u = newu;
            v = newv;
        }
    }
}

Exception in thread "main" java.lang.Error: Unresolved compilation problem: 
    Cannot instantiate the type Queue
    at TwoColor.main(TwoColor.java:8)

1

abstract class Account 
{ // abstract class Cannot Be initiated...
  private int amount;
  Account() 
  {
    //constructor............
  }
  public void withDraw(int amount) 
  {

    this.amount = this.amount - amount;
  }
}

Account acc = new Account(); // Abstract Cannot Intialized......

class BusinessAccount extends Account 
{
  private int Bonus;
  public void AwardBonus(int amount) 
  {
    this.Bonus = Bonus + amount;
  }
}

BusinessAccount bb = new BusinessAccount(); 
    //Bussiness Account Can Be intiated Because there is concreate defination..........

abstract class Account 
{ // abstract class Cannot Be intiated...
  private int amount;
  Account() 
  {
    //constructor............
  }
  public void withDraw(int amount) 
  {

    this.amount = this.amount - amount;
  }
}
class BusinessAccount extends Account 
{
  private int Bonus;
  public void AwardBonus(int amount) 
  {
    this.Bonus = Bonus + amount;
  }
}
public class Main {
  public static void main(String[] args) 
  {
    //Account acc = new Account(); // Abstract Cannot Intialized......
    BusinessAccount bb = new BusinessAccount(); 
    //Bussiness Account Can Be intiated Because there is concreate defination..........
  }
}

Welome to the Ranch

You have provided lots of useful information, more than some people do, but I can’t just offhand see the cause of your problem. Let’s try reformatting your code because your lines are so long that I can’t read them as one piece:-. . . That’s a bit better,, but there are still things to improve.

Don’t use so many empty lines. If you want to separate paragraphs use one empty line.

Be more consistent with where you haev spaces. Don’t write a space after ( but do put a space after a

<

or every comma.

Only use // comments for something very short, or for commenting‑out. For anything longer, use /* comments */

Call a method returning a

boolean

something different; you should write

isOccupied()

rather than

getOccupied()

; Eclipse can change that for you with its refectoring capabilities.

The old Sun style guide suggests, don’t use that

if‑else

in your lines 22‑26; Write:-Yuo will also find a section in the same style guide about line lengths.

Don&apost use tabs for indenting; get Ecipse to convert a tab to four spaces automatically.

There is something iffy about your casting those numbers to a

char

and I don’t think it will do what you want. Don’r hard‑code 65, which is error‑prone. If you have to hard‑ode anything, use

‘A’

. That will give you floors starting at B, and strange floor numbers if you have more than 25 of them.

It is not obvious what ariables called

s

and

c

mean.

The

>

which appeared mysteriously in line 19 is probably a problem with our forum software.

Your

setOccupied()

method is written incorrectly; it won’t do what you want.

I don’t like the overloaded constructors, particularly if you pass small

int

s which get cast to control characters or

n

or similar.

I still can’t see why line 28 won’t compile. I don’t like the look of line 58. Nor did the compiler. You are missing () in line 65, but I still can’t see how you are getting that error in line 28.