为什么不打印“Num”圈子？

问题描述：

该代码应打印出用户在“Num”处输入的圆圈数量，并给它们一个随机半径和中心点，但它不会绘制任何东西。该applet本身只显示“Applet开始”。任何解决方案为什么不打印“Num”圈子？

编辑：此外，打开的小程序不会关闭，直到Eclipse本身关闭。编辑：更新的代码。

import java.applet.Applet; 
import java.awt.*; 
import java.util.Random; 

public class project10 extends Applet { 

    ConsoleReader console = new ConsoleReader(System.in); 
    Random generator = new Random(); 

    private static final long serialVersionUID = -3660618513445557612L; 


    public void drawCenteredCircle(Graphics g, int x, int y, int r) { 
      g.fillOval(x,y,r,r); 
    } 


    public void paint(Graphics g){ 

     int num = 5; 

     try{ 
     System.out.println("How many circles would you like to draw?"); 
     //num = console.readInt(); 

     for(int i = 1; num >= i; i++){ 
      g.setColor(Color.BLACK); 
      int one = generator.nextInt(100); 
      int two = generator.nextInt(100); 
      int three = generator.nextInt(100); 
      drawCenteredCircle(g,one,two,three); 
     } 
     }catch(NumberFormatException e){ 
      System.out.println("Input was not a valid number, please try again."); 
     }finally{ 
      System.out.println("You printed " + num + " circles"); 
     } 
    } 

}

控制台读取器类：

import java.io.BufferedReader; 
import java.io.InputStream; 
import java.io.InputStreamReader; 
import java.io.IOException; 

/** 
    A class to read strings and numbers from an input stream. 
    This class is suitable for beginning Java programmers. 
    It constructs the necessary buffered reader, 
    handles I/O exceptions, and converts strings to numbers. 
*/ 

public class ConsoleReader 
{ /** 
     Constructs a console reader from an input stream 
     such as System.in 
     @param inStream an input stream 
    */ 
    public ConsoleReader(InputStream inStream) 
    { reader = new BufferedReader 
     (new InputStreamReader(inStream)); 
    } 

    /** 
     Reads a line of input and converts it into an integer. 
     The input line must contain nothing but an integer. 
     Not even added white space is allowed. 
     @return the integer that the user typed 
    */ 
    public int readInt() 
    { String inputString = readLine(); 
     int n = Integer.parseInt(inputString); 
     return n; 
    } 

    /** 
     Reads a line of input and converts it into a floating- 
     point number. The input line must contain nothing but 
     a nunber. Not even added white space is allowed. 
     @return the number that the user typed 
    */ 
    public double readDouble() 
    { String inputString = readLine(); 
     double x = Double.parseDouble(inputString); 
     return x; 
    } 

    /** 
     Reads a line of input. In the (unlikely) event 
     of an IOException, the program terminates. 
     @return the line of input that the user typed, null 
     at the end of input 
    */ 
    public String readLine() 
    { String inputLine = ""; 

     try 
     { inputLine = reader.readLine(); 
     } 
     catch(IOException e) 
     { System.out.println(e); 
     System.exit(1); 
     } 

     return inputLine; 
    } 

    private BufferedReader reader; 
}

该代码适用于我，您可能在HTML文件中发生了错误？你可以在eclipse中的applet查看器中运行它吗？ – spydon

这就是我最初运行它的地方@spydon – sirnomnomz

如果你设置num = 5并且不对你的ConsoleReader类进行调用，它是否工作？ – spydon

答

你ConsoleReader类以某种方式阻止，也可能是错误的，基本应该解决您的问题。

替换：

ConsoleReader console = new ConsoleReader(System.in);

与

Scanner console = new Scanner(System.in);

还记得，你必须按下输入您所输入的号码后，您必须在控制台输入它，而不是在小程序窗口。

编辑：由于小应用程序查看器正在关注焦点，所以必须在控制台中按下然后编写才能输入。（这可能也适用于您的其他控制台输入类）

这仍然无法正常工作。 – sirnomnomz

我添加了控制台阅读器类以供审阅@spydon – sirnomnomz

您是否能够提供您的输入？您是否在控制台中看到您的号码，并显示“您打印了＃个圈子”的文字？ – spydon

为什么不打印“Num”圈子？

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