Paddle.java

package testGame;

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Rectangle;

class Paddle extends Rectangle {
    //int x, y, width, height;  //WARNING: cannot redefine these Rectangle variables.

    boolean upAccel = false;
    boolean downAccel = false;
    //all doubles must have a decimal when declared. This makes it obvious to others that it is a double
    double yVel = 0.0;
    static final double MOVESPEED = 2.0;

    //final double GRAVITY = 0.98; //This is NOT gravity. It's an acceleation parameter. Your balls don't fall to the ground
    final double DAMPING = 0.98; //So we'll call it damping.

    Paddle(char c) {
        this.width = 35;
        this.height = 90;
        this.x = 100;  //fake number
        this.y = Game.SCREEN_HEIGHT / 2 - (height / 2);
        if (c == 'L') this.x = 10;
        if (c == 'R') this.x = Game.SCREEN_WIDTH - 10 - this.width;

    }


    public void move() {
        if (upAccel) {
            yVel -= MOVESPEED;
        } else if (downAccel) {
            yVel += MOVESPEED;
        } else if (!upAccel && !downAccel) {
            if((int)yVel != 0) {
                yVel *= DAMPING;
            }
        }

        if (yVel > 5) {
            yVel = 5;
        }
        if (yVel < -5) {    //replaced ElseIf with If
            yVel = -5;
        }

        y += (int)yVel;

        checkWallCollision();
    }

    //There's a bunch of stuff that no other class ever needs to see, so make it private instead of public or default.
    //Rename this so that it's clear that we're only checking wall collisions here
    private void checkWallCollision(){
        if(y <= 0) {
            y = 0;
            yVel = 0;
            return;
        }

        if(y + height >= Game.SCREEN_HEIGHT) {
            y = Game.SCREEN_HEIGHT - height;
            yVel = 0;
        }
    }

    void draw(Graphics g) {
        g.setColor(Color.white);
        g.fillRect(x, y, width, height);

    }
}