swing - Paint function will not iterate more than 3 times Java -

so every time run program , type 1 system, allow me move oval once,then program print debug 2 more times without moving oval. why?

    import java.awt.graphics; import java.awt.graphics2d; import java.util.scanner; import javax.swing.jframe;  /**  *  * @author admin  */ public class testinggame extends jframe{     public scanner scan = new scanner(system.in);     public static int x = 0;     public static int y = 0;     /**      * @param args command line arguments      */     public static void main(string[] args) {         testinggame myframe = new testinggame();         myframe.setsize(1000,1000);         myframe.setlocationrelativeto(null);         myframe.setdefaultcloseoperation(myframe.exit_on_close);         myframe.setvisible(true);       }     public void paint(graphics g){         update(g);     }         public void update(graphics g){         graphics2d ga = (graphics2d)g;         ga.drawoval(x, y, 50, 50);         int input = scan.nextint();         if(input == 1){             system.out.println("debug");             x = x + 100;             y = y + 100;         }     }   }