java - Changing SplashScreen Image with SplashScreen.setImageURL(link); -

i've found example in oracle docs splashscreen. problem in example link of image used here passed argument in command line. i'm trying change code link written inside , don't need use command line.

methode setimageurl(url imageurl) should able work me, it's not accepting argument (parameter).

i read url class, seems needs protocol! protocol http , ftp ? if that's case, how should url files in computer ? when try put link computer (ex: "c:\plash.gif") says illege excape character

i tried use http link image give me error within url line:

non-static method setimageurl(url) cannot referenced static context 

here's code:

package misc;  import java.awt.*; import java.awt.event.*; import java.net.url;  public class splashdemo extends frame implements actionlistener {     static void rendersplashframe(graphics2d g, int frame) {         final string[] comps = {"foo", "bar", "baz"};         g.setcomposite(alphacomposite.clear);         g.fillrect(120,140,200,40);         g.setpaintmode();         g.setcolor(color.black);         g.drawstring("loading "+comps[(frame/5)%3]+"...", 120, 150);     }     public splashdemo() {         super("splashscreen demo");         setsize(300, 200);         setlayout(new borderlayout());         menu m1 = new menu("file");         menuitem mi1 = new menuitem("exit");         m1.add(mi1);         mi1.addactionlistener(this);         this.addwindowlistener(closewindow);          menubar mb = new menubar();         setmenubar(mb);         mb.add(m1);         url link= new url("http://docs.oracle.com/javase/tutorial/uiswing/examples/misc/splashdemoproject/src/misc/images/splash.gif");         splashscreen.setimageurl(link);         final splashscreen splash = splashscreen.getsplashscreen();         if (splash == null) {             system.out.println("splashscreen.getsplashscreen() returned null");             return;         }          graphics2d g = splash.creategraphics();         if (g == null) {             system.out.println("g null");             return;         }         for(int i=0; i<100; i++) {             rendersplashframe(g, i);             splash.update();             try {                 thread.sleep(90);             }             catch(interruptedexception e) {             }         }         splash.close();         setvisible(true);         tofront();     }     public void actionperformed(actionevent ae) {         system.exit(0);     }      private static windowlistener closewindow = new windowadapter(){         public void windowclosing(windowevent e){             e.getwindow().dispose();         }     };      public static void main (string args[]) {         splashdemo test = new splashdemo();     } } 

this output:

exception in thread "main" java.lang.runtimeexception: uncompilable source code - unreported exception java.net.malformedurlexception; must caught or declared thrown     @ misc.splashdemo.main(splashdemo.java:103) java result: 1 build successful (total time: 4 seconds) 

and nothing happens.

p.s: i'm beginner java, i'm using netbeans ide 7.2.1

the splash screen can displayed @ application startup, before java virtual machine (jvm) starts.

the splash screen window closed automatically first window displayed swing/awt (may closed manually using java api, see below).

if application packaged in jar file, can use

splashscreen-image option in manifest file show splash screen.
place image in jar archive , specify path in option.
path should not have leading slash. example, in manifest.mf file:

 manifest-version: 1.0  main-class: test  splashscreen-image: filename.gif 

the splashscreen class provides api controlling splash screen. class may used

• close splash screen
• change splash screen image
• get splash screen native window position/size
• paint in splash screen.

it cannot used create splash screen.

• this class cannot instantiated.
• only single instance of class can exist, , may obtained using getsplashscreen() static method.

in case splash screen has not been created @ application startup via command line or manifest file option,

the getsplashscreen method returns null.

so wrong code?

not

splashscreen.setimageurl(link); 

ok

splash.setimageurl(link); 

---

wrong sequence : setting imageurl before have splash object

url link= new url("http://docs.oracle.com/javase/tutorial/uiswing/examples/misc/splashdemoproject/src/misc/images/splash.gif");         splashscreen.setimageurl(link);         final splashscreen splash = splashscreen.getsplashscreen(); 

correct : splash , set imageurl

short

final splashscreen splash = splashscreen.getsplashscreen(); splash.setimageurl(link); 

long catch malformedurlexception rid of error
malformedurlexception : must caught

final splashscreen splash = splashscreen.getsplashscreen(); if (splash == null) {        system.out.println("splashscreen.getsplashscreen() returned null");             return;    } url link;    try {         link = new url("http://docs.oracle.com/javase/tutorial/uiswing/examples/misc/splashdemoproject/src/misc/images/splash.gif");        } catch (malformedurlexception ex) {             system.out.println("malformedurlexception link:77");             return;        }    try {             splash.setimageurl(link);        } catch (nullpointerexception | ioexception | illegalstateexception ex) {             system.out.println("nullpointer or io or illegalstate setimageurl:85");             return;        } 

to recognize difference between local image file , image file on internet . have made local blue splash.gif file.

the proceeding follows.

• local image loaded. (splashscreen-image option in manifest file)

• internet image loaded. (//docs.oracle.com...images/splash.gif)

• application appears.

---

to work in netbeans

and not error splashscreen.getsplashscreen() returned null

final splashscreen splash = splashscreen.getsplashscreen();     if (splash == null) {            system.out.println("splashscreen.getsplashscreen() returned null"); 

you must following.

in properties point local .gif file : -splash:src/misc/images/splash.gif