Question

所以，该程序是针对学校的，我遇到了一些问题，基本前提是必须让用户选择形状，大小和颜色，然后绘制形状或使其动画以在屏幕上移动。

我的程序在没有thread.sleep的情况下工作正常（它会立即在屏幕上移动）。当我添加thread.sleep它没有工作并等待10秒后才立即移动到最后。

经过测试后，似乎与for循环有一些相关性，因为当for循环为1000时它等待10秒然后立即移动1000个空格但是当for循环为100时它只需要一秒钟立即移动100个空间。

我的理解是它应该等待10毫秒才能再次进入for循环。

import java.awt.*;
import java.awt.event.*;
import java.applet.*;

public class AppletAssignemntIsFucked extends Applet
    implements ActionListener
{
int colourChoice;
int shapeChoice;
int location;
int x, y;
TextField height = new TextField ("00");
TextField width = new TextField ("00");
boolean animating = false;

//declare the two types of checkboxes
CheckboxGroup shape, colour;
//declare all the shape checkboxes
Checkbox buttonSquare, buttonCircle, buttonRectangle, buttonOval;
//declare all the colour checkboxes
Checkbox buttonRed, buttonBlue, buttonGreen, buttonYellow;

Button buttonDraw, buttonAnimate, buttonReset;

public void init ()
{
    setBackground (Color.lightGray);

    shape = new CheckboxGroup ();
    colour = new CheckboxGroup ();

    buttonCircle = new Checkbox ("Circle", shape, true);
    add (buttonCircle);
    buttonSquare = new Checkbox ("Square", shape, false);
    add (buttonSquare);
    buttonRectangle = new Checkbox ("Rectangle", shape, false);
    add (buttonRectangle);
    buttonOval = new Checkbox ("Oval", shape, false);
    add (buttonOval);

    buttonRed = new Checkbox ("Red", colour, true);
    add (buttonRed);
    buttonBlue = new Checkbox ("Blue", colour, false);
    add (buttonBlue);
    buttonGreen = new Checkbox ("Green", colour, false);
    add (buttonGreen);
    buttonYellow = new Checkbox ("Yellow", colour, false);
    add (buttonYellow);

    buttonDraw = new Button ("draw");
    buttonDraw.addActionListener (this);
    add (buttonDraw);
    buttonAnimate = new Button ("animate");
    buttonAnimate.addActionListener (this);
    add (buttonAnimate);
    buttonReset = new Button ("reset");
    buttonReset.addActionListener (this);
    add (buttonReset);

    add (height);
    add (width);
}


public void paint (Graphics g)
{
    switch (colourChoice)
    {
        case 1:
            g.setColor (Color.red);
            break;
        case 2:
            g.setColor (Color.green);
            break;
        case 3:
            g.setColor (Color.yellow);
            break;
        case 4:
            g.setColor (Color.blue);
            break;
    }
    switch (shapeChoice)
    {
        case 1:
            g.fillOval (location, 80, x, x);
            break;
        case 2:
            g.fillRect (location, 80, x, x);
            break;
        case 3:
            g.fillRect (location, 80, x, y);
            break;
        case 4:
            g.fillOval (location, 80, x, y);
            break;
    }

}


public void actionPerformed (ActionEvent evt)
{

    y = Integer.parseInt (height.getText ());
    x = Integer.parseInt (width.getText ());
    //set the colour
    if (evt.getSource () == buttonAnimate)
    {
        for (int i = 0 ; i < 1000 ; i++)
        {
            try
            {
                Thread.sleep (10);         
            }
            catch (InterruptedException ex)
            {
                Thread.currentThread ().interrupt ();
            }
            location += 1;
            repaint ();
        }
    }
    if (evt.getSource () == buttonReset)
    {
        location = 10;
        repaint ();
    }
    if (evt.getSource () == buttonDraw)
    {
        if (buttonRed.getState () == true)
        {
            colourChoice = 1;

        }
        else if (buttonGreen.getState () == true)
        {
            colourChoice = 2;

        }
        else if (buttonYellow.getState () == true)
        {
            colourChoice = 3;

        }
        else if (buttonBlue.getState () == true)
        {
            colourChoice = 4;
        }
        //set the shape
        if (buttonCircle.getState () == true)
        {
            shapeChoice = 1;
        }
        else if (buttonSquare.getState () == true)
        {
            shapeChoice = 2;
        }
        else if (buttonRectangle.getState () == true)
        {
            shapeChoice = 3;
        }
        else if (buttonOval.getState () == true)
        {
            shapeChoice = 4;
        }

        repaint ();
    }


}

}

Answer 1

您屏蔽Event Dispatch Thread，因此无法更新用户界面例如。见Thread Sleeping Before GUI Updating。

改为使用Swing Timer。

thread.sleep没有做

1 个答案: