Pong w/ AI

package games;
import acm.program.*;
import acm.graphics.*;
import java.awt.*;
import java.awt.event.*;
public class Pong extends GraphicsProgram {
    private GRect paddle;
    private GRect paddle2;
    public void run() {
        this.setSize(500,500);
        int point = 0;
        int diff = 0;
        int reset = 0;
        int a=0;
        int b=0;
        int c=0;
        int d=0;
        int e=100;
        int e2 = 100;
        int f=25;
        int g=5;
        int hit=0;
        double dx = 3;
        double dy = -4;
        paddle2 = new GRect((500 - 20), 10, 10, e2);
        paddle2.setFilled(true);
        add(paddle2);
        paddle = new GRect(10, 10, 10, e);
        paddle.setFilled(true);
        add(paddle);
        addMouseListeners();
        GOval ball = new GOval(250, 250, f, f);
        ball.setFilled(true);
        ball.setFillColor(new Color(0, 0, 225));
        add(ball);
        System.out.println("Easy");
        System.out.println("AI Difficulty?");
        diff = readInt();
        System.out.println("AI Speed is " + diff);
        while (g>0&&hit<20) {
            reset=0;
            d=0;
            while ((hit < 100)&&(reset == 0))  {
                pause(25);
                double ballLeft = ball.getX();
                double ballRight = ball.getX() + ball.getWidth();
                double ballYMid = ball.getY() + ball.getHeight() / 2;
                double paddleRight = paddle.getX() + paddle.getWidth();
                double paddleTop = paddle.getY();
                double paddleBot = paddle.getY() + paddle.getHeight();
                double paddle2Left = paddle2.getX();// - paddle.getWidth();
                double paddle2Top = paddle2.getY();
                double paddle2Mid = paddle2.getY() + (paddle2.getHeight() / 2);
                double paddle2Bot = paddle2.getY() + paddle2.getHeight();
                if (ballYMid > (paddle2Mid + (diff/2))) {
                    paddle2.setLocation(paddle2Left, (paddle2Top + diff));
                }
                if (ballYMid < (paddle2Mid - (diff/2))) {
                    paddle2.setLocation(paddle2Left, (paddle2Top - diff));
                }
                if ((ballLeft <= paddleRight && ballLeft > paddleRight + dx
                        && ballYMid >= paddleTop && ballYMid < paddleBot)) {
                    dx = -dx;
                    hit++;
                    dx++;
                    System.out.println(hit + " hits");
                    if (dy > 0) {
                        dy++;
                    }
                }
                if ((ballRight >= paddle2Left) && (ballYMid >=paddle2Top)
                        && (ballYMid <= paddle2Bot)) {
                    dx = -dx;
                }
                if (ball.getY() + ball.getHeight() >= getHeight()
                        || ball.getY() <= 0.0) {
                    dy = -dy;
                }
                if (ballRight >= getWidth()) {
                    ++point;
                    System.out.println("You get a point!");
                    System.out.println("P=" + point);
                    ball.setLocation(250, 250);
                    dx = -dx;
                    pause(1000);
                }
                if (hit == 5 && a == 0) {
                    ball.setFillColor(new Color(0, 255, 0));
                    System.out.println("Medium");
                    a++;
                }
                if (hit == 10 && b == 0) {
                    ball.setFillColor(new Color(255, 0, 0));
                    System.out.println("Hard");
                    b++;
                }
                if (hit == 15 && c == 0) {
                    ball.setFillColor(new Color(255, 255, 255));
                    System.out.println("INSANE!!!");
                    c++;
                }
                if (ball.getX() + ball.getWidth() <= 0 && d == 0) {
                    System.out.println("FAILURE");
                    reset=1;
                    d++;
                    g--;
                    dx=-dx;
                    ball.setLocation(250, 250);
                }
                ball.move(dx, dy);
            }
            if (hit==20) {
                System.out.println("BUTKA HATE YOU!!!");
            }
            if(g==0){
                System.out.println("BUTKA SAYS YOU LOSE!!!");
            }
            ball.setFillColor(new Color(0, 0, 0));
            pause(1000);
            reset=0;
            ball.setFillColor(new Color(0, 0, 225));
        }
    }

    public void mouseMoved(MouseEvent event) {
        double paddleY = event.getY() - paddle.getHeight() / 2;
        double paddleMax = getHeight() - paddle.getHeight();
        if(paddleY < 0) paddleY = 0;
        if(paddleY > paddleMax) paddleY = paddleMax;
        paddle.setLocation(10, paddleY);
    }
}