After the for loop is finished why nothing is displayed in the applet screen?

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Below is a simple Applet Code the problem is after for loop is finished.

Nothing is displayed on the applet screen.

I guess screen is cleared after for loop is finished.

I am unable to fix it I would like to know how to prevent the screen from clearing so that my output is there on the screen.

public class ColorArcs extends Applet
{
int width=50;
int length=50;

int topx=200-25,topy=200-25;

public void paint(Graphics g)
{
    for(;length<250;)
    {
        g.drawArc(200-length/2,200-width/2,length,width,0,180);

        length+=2;
        width++;

        if(length>=50&&length<=75)
            setForeground(Color.cyan);
        else
            if(length>=75&&length<=100)
            setForeground(Color.yellow);
        else
            if(length>=100&&length<=125)
            setForeground(Color.green);
        else
            setForeground(Color.red);

        try
        {
            Thread.sleep(80);
        }
        catch(InterruptedException ie){}
    }
}
}

You are setting the foreground after setting the arc, therefore, it gets written over. That's why you're not getting anything to see.

Creating the Animation Loop, This page provides two templates for performing animation, one for applets and //In a method that does nothing but stop the animation: //Stop the animating The animation loop (the while loop in the animation thread) does the following, over and over Advance the animation frame and display it. try { startTime += delay;� 1 After the for loop is finished why nothing is displayed in the applet screen? Mar 30 '19. 1 PDFBox - “no main manifest attribute

It is not getting cleared after for loop finished.

Applets and Java Web Start Applications, If your application will not run, perform the following checks: To pass parameters to a specific JVM used with Java Web Start or an applet, use one of the Check for configuration errors and try to reinstall the JRE if nothing else helps. This can be done in the application deployment descriptor (JNLP file) or in the Java� I am writing this code that my professor did in class, but nothing is showing in the applet. I type everything like he did and i don't have errors. I create it the .class for the file but the applet is appear with a red X only. Here is the code, in case someone can see something that I can't since I don't know much about java.

To maintain the paint follow the idea of Abhinav. But to change the color see the code bellow: (everything is not fixed but you can start with the idea)

public class ColorArcs extends Applet
{
int width=50;
int length=50;

int topx=200-25,topy=200-25;

public void paint(Graphics g)
{
    for(;length<250;)
    {
        length+=2;
        width++;

        if(length>=50&&length<=75)
            setForeground(Color.cyan);

    }

    int length_ = 50; width=50;
    for(;length_<250;)
    {
        g.drawArc(200-length_/2,200-width/2,length_,width,0,180);

        length_+=2;
        width++;

        try
        {
            Thread.sleep(20);
        }
        catch(InterruptedException ie){}
    }
}
}

Section 6.1 The Basic Java Applet and JApplet, Very little of that statement is completely accurate, however. When shown in a window, an applet is a rectangular area that can contain other components, such as It can display graphical elements such as images, rectangles, and lines. There are several methods in the Applet class that are defined to do nothing at all . I added a PRINT so that I know that the process is running correctly and it's not in an infinite loop. Unfortunately, when I execute the script (and this WHILE loop), I notice that the PRINT is not displayed until the script runs completely or the script is stopped (and rollback is complete). But whils it's running, I see nothing on the screen.

Java Applet Basics, When an applet begins, the following methods are called, in this The second statement import the Graphics class from AWT package. specify the dimensions of the display area used by the applet. Features of Applets over HTML Please write comments if you find anything incorrect, or you want to� Here, we have shown four circle one below other using "for" loop with two different colors. The methods used are drawOval( ), fillOval( ) and setColor( ).Details of these methods are given in previous programs.

Chapter 10 -- The while and do-while Loops, This program block tells Java where the body of the loop begins and ends. The pseudocode given after the listing illustrates how this while loop works. So, in this example, you put together an applet that uses a while loop to create its display. Listing This won't hurt anything, but you'll be unable to see the entire output. Problem: My applet does not display. Check the Java Console log for errors. Check the syntax of the applet's Java Network Launch Protocol (JNLP) file. Incorrect JNLP files are the most common reason for failures without obvious errors.

Day 10 -- Simple Animation and Threads, So, to change the appearance of what is on the screen, you construct the image or creating a very simple animated digital clock (a frame from that clock is shown in We'll take another look at this applet later, after we've discussed threads in be sitting and waiting for the while() loop to finish before it did anything else. To keep screen busy after the script completes, just keep something persistent running in a window. The simplest choice for that "something" is probably an interactive shell. Here's one way to do it (assuming bash as the choice of interactive shell): screen -dmS session_name sh -c '/share/Sys/autorun/start_udp_listeners.sh; exec bash'

Comments
  • Applets are a dead technlogy. modern browsers even don't support Java applets anymore. So if you want to do graphics programming in Java, use awt, swing or javafx.