java - "this" does not work in my program -

-

so basically, i'm doing assignment on game, , i'm trying create key commands. thing not work far addkeylistener(**this**).i tried fixing ended breaking entire program. code far is:

public static void main (string[] args)     throws interruptedexception {     (int x = 0 ; x < 999 ; x++)     {         int lvl = 0;         int line = 0;         write ();         line = start (line);         (int p = 0 ; p < 999 ; p++)         {             if (line == 0)             {                 system.out.println ("select level (1-3)");                 lvl = in.getint ();                 if (lvl == 1)                 {                     jframe gamu = new jframe ("hoops 1.0");                        //jframe runs game in window                     culminating_mingxuanhe ball = new culminating_mingxuanhe ();                     gamu.getcontentpane ().add (ball);                     gamu.setsize (400, 480);       //sets size game                     gamu.setvisible (true);                     ball.addkeylistener (this);                     gamu.setdefaultcloseoperation (jframe.exit_on_close);   //closes program when game closed                     while (true)                     {                         ball.moveball ();       //runs methods                         ball.repaint ();                         thread.sleep (8);     //speed of square                     }                 }                 }         }         if (line == 1)         {             system.out.println ("goodbye, have nice day");             x = 999;         }     } }   int = 200, s = 1, d = 100, f = 1;     //initial position of square int q = 150, w = 430, e = 80, r = 10; int plat = 149; int plat2 = 81; int mov = 10;  public void moveball () {     if (a + s < 0)      //border on left         s = 1;     if (a + s > getwidth () - 25)      //border on right         s = -1;     if (d + f < 0)         //border on top         f = 1;     if (d + f > getheight () - 25)  //border on bottom         f = -1;     = + s;           //moves ball     d = d + f; }  public void keyboardexample () {     keylistener listener = new keypressed ();     addkeylistener (listener);     setfocusable (true); }   public void keypressed (keyevent e) {     int key = e.getkeycode ();     if (key == keyevent.vk_left)     {         plat = plat - mov;     }     if (key == keyevent.vk_right)     {         plat = plat + mov;     } }   public void keytyped (keyevent e) { }   public void keyreleased (keyevent e) { }

}

you trying access instance of object. can't that, because main method static. static methods part of class, , instance methods part of object. doing in code trying access object used call main (i.e. variable.main), doesn't work because there no object. helped :)


Comments

Post a Comment

Popular posts from this blog

Java 3D LWJGL collision -

-
i making 3d java game lwjgl library, , wondering how add collision detection, player not go through models. i using obj models. here objloader class, loads models: package renderengine; import java.io.bufferedreader; import java.io.file; import java.io.filenotfoundexception; import java.io.filereader; import java.util.arraylist; import java.util.list; import models.rawmodel; import org.lwjgl.util.vector.vector2f; import org.lwjgl.util.vector.vector3f; public class objloader { public static rawmodel loadobjmodel(string filename, loader loader){ filereader fr = null; try { fr = new filereader(new file("res/"+filename+".obj")); } catch (filenotfoundexception e) { system.err.println("couldn't load file!"); e.printstacktrace(); } bufferedreader reader = new bufferedreader(fr); string line; list<vector3f> vertices = new arraylist<vector3f...
Read more

spring - SubProtocolWebSocketHandler - No handlers -

-
i have ugly error during deploying spring app on jboss. 18:11:16,025 error [org.apache.catalina.core.containerbase.[jboss.web].[default-host].[/consumer]] (msc service thread 1-7) exception sending context initialized event listener instance of class org.springframework.web.context.contextloaderlistener: org.springframework.context.applicationcontextexception: failed start bean 'subprotocolwebsockethandler'; nested exception java.lang.illegalargumentexception: no handlers @ org.springframework.context.support.defaultlifecycleprocessor.dostart(defaultlifecycleprocessor.java:176) [spring-context-4.1.3.release.jar:4.1.3.release] @ org.springframework.context.support.defaultlifecycleprocessor.access$200(defaultlifecycleprocessor.java:51) [spring-context-4.1.3.release.jar:4.1.3.release] @ org.springframework.context.support.defaultlifecycleprocessor$lifecyclegroup.start(defaultlifecycleprocessor.java:346) [spring-context-4.1.3.release.jar:4.1.3.release] @ org.s...
Read more

methods - python can't use function in submodule -

-
my folder structure this: pythonstuff/ program.py modulea/ __init__.py foo.py bar.py here's code bar.py : def hello(): print("hello, world!") here's code program.py : #!/usr/bin/env python3 modulea import bar bar.hello() i run $ python3 program.py somehow error: file "program.py", line 3, in <module> bar.hello() attributeerror: 'module' object has no attribute 'hello' edit: __init__.py file empty. edit2: after trying realized had bar.py in root directory contained hello() method. bar.py in modulea/ directory empty. add it import os __all__ = [] module in os.listdir(os.path.dirname(__file__)): if module != '__init__.py' , module[-3:] == '.py': __all__.append(module[:-3]) the init .py files required make python treat directories containing packages; done prevent directories common name, such string, unintentionally hiding v...
Read more