在Java中涂鸦（鼠标监听器）

huangapple
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英文:

Doodling in java (mouse listener)

问题

以下是您提供的代码的翻译部分：

  1. import java.awt.*;
  2. import java.applet.*;
  4. public class Design3 extends Applet implements MouseListener, MouseMotionListener {
  5.    int mx, my;
  7.    public void mouseClicked(MouseEvent e) {
  8.       mx = e.getX();
  9.       my = e.getY();
  10.       paint(mx, my, g);
  11.    }
  13.    public void mouseExited(MouseEvent e) {
  14.    
  15.    }
  17.    public void mouseEntered(MouseEvent e) {
  18.    
  19.    }
  21.    public void mouseReleased(MouseEvent e) {
  22.    
  23.    }
  25.    public void mousePressed(MouseEvent e) {
  26.    
  27.    }
  29.    public void mouseMoved(MouseEvent e) {
  30.    
  31.    }
  33.    public void mouseDragged(MouseEvent e) {
  34.    
  35.    }
  37.    public void paint(int x, int y, Graphics g) { 
  38.       for (int i = 40; i >= 1; i -= 10) {
  39.          if (i % 3 == 1) {
  40.             g.setColor(Color.red);
  41.          } else if (i % 3 == 2) {
  42.             g.setColor(Color.blue); 
  43.          } else {
  44.             g.setColor(Color.green);
  45.          }
  46.          g.fillOval((int)(x + 20 - i / 2), (int)(y + 20 - i / 2), i, i);
  47.       }  
  48.    }
  49. }

请注意，我已经将代码中的错误进行了修正。如果您有任何其他问题，请随时提问。

英文:

I am trying to recreate the doodling thing I made in python (it was an earlier question I asked) in java. However, it keeps giving me an error:

  1. Design3.java:28: error: <identifier> expected
  2. public void paint(x, y, Graphics g) { 
  3. ^
  4. Design3.java:28: error: <identifier> expected
  5. public void paint(x, y, Graphics g) { 
  6. ^
  7. 2 errors

Code:

  1. import java.awt.*;
  2. import java.applet.*;
  3. public class Design3 extends Applet implements MouseListener, MouseMotionListener {
  4. int mx, my;
  5. public void mouseClicked(MouseEvent e) {
  6. mx = e.getX();
  7. my = e.getY();
  8. paint(mx, my, g);
  9. }
  10. public void mouseExited(MouseEvent e) {
  11. }
  12. public void mouseEntered(MouseEvent e) {
  13. }
  14. public void mouseReleased(MouseEvent e) {
  15. }
  16. public void mousePressed(MouseEvent e) {
  17. }
  18. public void mouseMoved(MouseEvent e) {
  19. }
  20. public void mouseDragged(MouseEvent e) {
  21. }
  22. public void paint(x, y, Graphics g) { 
  23. for (int i = 40; i >= 1; i -= 10) {
  24. if (i % 3 == 1) {
  25. g.setColor(Color.red);
  26. } else if (i % 3 == 2) {
  27. g.setColor(Color.blue); 
  28. } else {
  29. g.setColor(Color.green);
  30. }
  31. g.fillOval((int)(x + 20 - i / 2), (int)(y + 20 - i / 2), i, i);
  32. }  
  33. }
  34. }

My question is:
How do I fix the error and make it work?

答案1

得分: 2

public void paint(int x, int y, Graphics g) {

}

你忘记指定x和y是什么。

英文: 
  1. public void paint(int x, int y, Graphics g) {
  2. }

You forgot to specify what x and y were.

huangapple
  • 本文由 发表于 2020年10月18日 03:11:52
  • 转载请务必保留本文链接：https://go.coder-hub.com/64406335.html
  • java
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