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POHow do you create object several times to move simultaneously on screen?
 

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  1. POHow do you create object several times to move simultaneously on screen?
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    <p>I have a thread which drops a circle in the y direction. I want to now create several circles on screen dropping at the same time with random x positions. </p> <pre><code>import java.awt.Color; import java.awt.Component; import java.awt.Dimension; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.RenderingHints; import javax.swing.JFrame; import javax.swing.JPanel; public class Goo { protected GooPanel gooPanel; private boolean loop = true; protected int width , height; private int frameTimeInMillis = 50; private RenderingHints renderingHints = new RenderingHints( RenderingHints.KEY_ANTIALIASING , RenderingHints. VALUE_ANTIALIAS_ON); @SuppressWarnings("serial") class GooPanel extends JPanel { public void paintComponent(Graphics g) { Graphics2D g2d = (Graphics2D) g; g2d.setRenderingHints(renderingHints); draw(g2d); } } public Goo() { this (800, 500); } public Goo(int w, int h) { width = w; height = h; JFrame frame = new JFrame (); frame.setSize(width , height); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); gooPanel = new GooPanel (); gooPanel.setPreferredSize(new Dimension(w, h)); frame.getContentPane ().add(gooPanel); frame.pack(); frame.setVisible(true); } public void go() { while (loop) { gooPanel.repaint(); try { Thread.sleep(frameTimeInMillis); } catch (InterruptedException e) {} } } public void draw(Graphics2D g) {} public void setFrameTime(int millis) { frameTimeInMillis = millis; } public Component getGooPanel () { return gooPanel; } } </code></pre> <p>My FallingDrop class:</p> <pre><code>import java.awt.*; public class FallingDrops extends Goo { double x, y, r; int red, green, blue = 0; Color a; FallingDrops() { x = width / 2; r = 10; y = -r; } FallingDrops(double x) { this.x = x; r = 10; y = -r; } public void draw(Graphics2D g) { g.setColor(Color.GRAY); g.fillRect(0, 0, width , height); g.setColor(Color.WHITE); g.fillOval ((int) (x - r), (int) (y - r), (int) (2 * r), (int) (2 * r)); y++; if (y - r &gt; height) y = -r; } public static void main(String [] args) { int num = 10; Goo gooDrop [] = new FallingDrops[num]; for(int i = 0; i &lt; gooDrop.length; i++) { double x = Math.random()*800; gooDrop[i] = new FallingDrops(x); System.out.println(x); gooDrop[i].go(); } } } </code></pre> <p>At current, the loop fails to complete when the go() method is executed; thus only painting ONE object on screen, and not several as indicated in my loop. This is a simple fix I am sure. Any ideas what I am doing wrong?</p>
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    1. COFor better help sooner, post an [SSCCE](http://sscce.org/).
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      1. POHow do you create object several times to move simultaneously on screen?
      1. USAndrew Thompson
    2. CODon't you need to modify 'loop' somewhere?
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      1. POHow do you create object several times to move simultaneously on screen?
      1. USTudor
    3. COThe code in this question looks very similar to http://stackoverflow.com/questions/14265892/why-does-this-code-produce-two-screens
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      1. USKrease
 

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