Java Game

import javax.swing.*;
import java.awt.*;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.geom.Line2D;
import java.util.Random;

public class Drawing extends JPanel implements KeyListener,Runnable
{
    public static JFrame frame;
    public static JLabel label;
    public static int[] x=new int[20];
    public static int[] y=new int[20];
    public static int a;
    public static Random random;
    public static int p_x=0;
    public static int p_y=0;
    public static int enemy_stop=0;
    public static boolean isin=false;
    public static Thread move;
    public static Rectangle active;
    public static Rectangle[] generated=new Rectangle[20];
    public static boolean ready=false;
    public static int con;

    public static void drawframe(int width,int height)
    {
        frame=new JFrame("The game");
        frame.setLayout(new BorderLayout());
        frame.setSize(width,height);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);
        frame.setResizable(false);
    }

    public void paintComponent(Graphics g)
    {
        super.paintComponent(g);

        drawenemies(g,5);
        setradius(g);
        setplayer(g);

            if(entered()&&isin!=true)
            {
                isin=true;
                move=new Thread(new Drawing());
                move.start();
            }

            if(entered()==false&&isin==true)
                isin=false;

                for(int i=1;i<=a;i++)
                {
                Line2D left = new Line2D.Double(x[i], y[i]+5, x[i]-150, y[i]+5);
                Line2D right = new Line2D.Double(x[i], y[i]+5, x[i]+150, y[i]+5);

                g.setColor(Color.BLUE);

                if(p_y==y[i])
                {
                    if(p_x>x[i])
                        g.drawLine((int)right.getX1(),(int)right.getY1(),(int)right.getX2(),(int)right.getY2());

                     else
                         g.drawLine((int)left.getX1(),(int)left.getY1(),(int)left.getX2(),(int)left.getY2());
                }
           }

    }

    public void drawenemies(Graphics g,int amount)
    {
        random=new Random();
        a=amount;
        enemy_stop=enemy_stop+1;

        if(enemy_stop<=1)
        {
            for(int i=1;i<=amount;i++)
            {
                x[i]=random.nextInt(frame.getWidth());
                y[i]=random.nextInt(frame.getHeight());
            }
        }

        for(int i=1;i<=amount;i++)
        {
            g.fillRect(x[i], y[i], 20, 20);
            Rectangle store=new Rectangle(x[i], y[i], 20, 20);
            generated[i]=store;
        }
    }

    public void setradius(Graphics g)
    {
        g.setColor(Color.RED);

        for(int i=1;i<=a;i++)
        {
            g.drawRect(x[i]-40, y[i]-40, 100, 100);
        }
    }

    public void setplayer(Graphics g)
    {
        g.setColor(Color.GREEN);
        g.fillRect(p_x, p_y, 20, 20);
        g.setColor(Color.BLACK);
        g.drawRect(p_x, p_y, 20, 20);
    }

    public static void main(String args[])
    {
        drawframe(500,500);
        Drawing instance=new Drawing();
        frame.add(instance);
        frame.addKeyListener(instance);

    }

    public boolean entered()
    {
        boolean entered=false;

        for(int i=1;i<=a;i++)
        {
            Rectangle q=new Rectangle(x[i]-40, y[i]-40, 100, 100);
            Rectangle s=new Rectangle(p_x, p_y, 20, 20);

            if(q.contains(s))
            {
                entered=true;
                active=new Rectangle(x[i], y[i], 20, 20);
            }
        }

        return entered;
    }

    @Override
    public void keyPressed(KeyEvent e)
    {
        switch(e.getKeyCode())
        {
        case 39: p_x=p_x+10;repaint();break;
        case 37: p_x=p_x-10;repaint();break;
        case 38: p_y=p_y-10;repaint();break;
        case 40: p_y=p_y+10;repaint();break;
        }
    }

    public void keyReleased(KeyEvent arg0){}
    public void keyTyped(KeyEvent arg0){}

    @Override
    public void run()
    {
        try
        {

        for(int i=1;i<=a;i++)
        {
            if(active.getX()==generated[i].getX())
            {
                con=i;

                while(x[i]!=p_x||y[i]!=p_y)
                {
                    if(x[i]>p_x)
                        x[i]=x[i]-1;
                    else
                        x[i]=x[i]+1;

                    if(y[i]>p_y)
                        y[i]=y[i]-1;
                    else
                        y[i]=y[i]+1;

                    Thread.sleep(100);
                    frame.repaint();
                }
            }
        }
    }
    catch(InterruptedException e){}
  }
}