java - "Cannot instantiate the Type Main" -

i keep getting error every time create new object class name:

"cannot instantiate type main"

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this code:

import javax.swing.*; import java.util.scanner; import java.applet.applet; import java.awt.*; import java.awt.event.actionevent; import java.awt.event.actionlistener; import java.awt.event.keyevent; import java.awt.event.keylistener; import java.awt.geom.ellipse2d;  public abstract class main extends jpanel implements actionlistener, keylistener{  timer t = new timer(5, this); double x = 0, y = 0, velx = 0, vely = 0;  public main() {     t.start();     addkeylistener(this);     setfocusable(true);     setfocustraversalkeysenabled(false);  }  public void paintcomponent(graphics g) {     super.paintcomponent(g);     graphics2d g2 = (graphics2d) g;     g2.fill(new ellipse2d.double(x, y, 40, 40));     }  public void actionperformed(actionevent e) {     repaint();     x += velx;     y += vely;      }  public void up() {     vely = -1.5;     velx = 0;     }  public void down() {     vely = -1.5;     velx = 0;     }  public void left() {     velx = -1.5;     vely = 0;      } public void right() {     velx = -1.5;     vely = 0;      }  public void keypressed(keyevent e) {     int code = e.getkeycode();     if (code == keyevent.vk_up) {         up();         }     if (code == keyevent.vk_down) {         down();     }     if (code == keyevent.vk_left) {         left();     }     if (code == keyevent.vk_right) {         right();     }      main m = new main();     jframe f = new jframe();     f.add(m);     f.setvisible(true);;     f.setdefaultcloseoperation(jframe.exit_on_close);     f.setsize(800,600);  } public void keytyped(keyevent e) {} public void keyreleased(keyevent e) {}  } 

and object keeps getting "error":

main m = new main(); 

(i very new making ui's, infact, 3rd, have no idea why cannot instantiate type)

you can't instantiate abstract classes in java, main class abstract, make concrete class, since seems have functionalists , no need declare abstract class.

public class main extends jpanel implements actionlistener, keylistener { } //abstract keyword removed 

consider using abstract classes if of these statements apply situation:

• you want share code among several closely related classes.
• you expect classes extend abstract class have many common methods or fields, or require access modifiers other public (such protected , private).
• you want declare non-static or non-final fields. enables define methods can access , modify state of object belong.