Question

该程序应该在一个代表屏幕分辨率的矩形中打印出点。输入屏幕分辨率后，点不会打印出来，静态变量screenCount不会跟踪制作的屏幕数量。它只停留在1.

public class Screen
{
   private static int screenCount;
   private int height;
   private int width;

   public Screen()
   {
      screenCount = 0;
      height = 0;
      width = 0;
   }
   public Screen(int newHeight, int newWidth)
   {
      height = newHeight;
      width = newWidth;

   }   
   public int getHeight()
   {
      return height;
   }    
   public int getWidth()
   {
      return width;
   }   
   public boolean setHeight(int newHeight)
   {
      if (newHeight <= 1080 && newHeight >= 720)
      {
         height = newHeight;
         return true;
      }
      else
      {
         System.out.println("ERROR height");
         return false;
      }      
   }   
   public boolean setWidth(int newWidth)
   {
      if (newWidth <= 1920 && newWidth <= 1280)
      {        
         width = newWidth;
         return true;
      }
      else
      {
         System.out.println("ERROR width");
         return false;
      }

   }   
   public void draw()
   {
      screenCount++;
      for(int i = 0; i < height; i++)
      {
         for(int j = 1; j <= width; j++)
          {

            System.out.print(".");

         }
         System.out.println();
      }               
   }

   public static int getScreenCount()
   {
      return screenCount;
   }   
}




// Tester
import java.util.Scanner;
public class ScreenBuilder
{


   public static void main(String[] args)
   {
      String again = "";
      do
      {

         Screen myScreen = new Screen();
         int myScreenHeight = 0;
         int myScreenWidth = 0;
         Scanner kb = new Scanner(System.in);
         do
         {
            System.out.println("Enter desired height of screen (720 - 1080)");
            myScreenHeight = kb.nextInt();
            System.out.println();
         }
         while(!(myScreen.setHeight(myScreenHeight)));

         System.out.println();

         do
         {
            System.out.println("Enter desired width of screen (1280 - 1920)");
            myScreenHeight = kb.nextInt();
            System.out.println();
         }
         while(!(myScreen.setWidth(myScreenWidth)));


         myScreen.draw();

         System.out.println("There were " + Screen.getScreenCount() + " Screens Printed");


         Scanner answer = new Scanner(System.in);
         System.out.println("Would you like to build another screen (Y/N)?");
         again = answer.nextLine();
      }  
      while ("y".equalsIgnoreCase(again));

 }

}

Answer 1

私有静态变量只能在该类中访问，尝试使用public static int Screencount，它可能有帮助。

静态变量不递增，屏幕未绘制

1 个答案: