Detect collision between corners of objects

I'm writing a game based on the breakout , but I can not think of a way to detect the collision between the corner of the ball area and the paddle, to be able to reverse the horizontal direction of the ball.

In my class Ball , I have a method that takes care of the movement of the ball, and when it detects a collision, it only reverses the vertical direction (y-axis).

import java.awt.Graphics2D;
import java.awt.Rectangle;

public class Ball {

    private int x = 0;
    private int y = 15;
    private final int DIAMETER = 30;
    private int xSpeed = 1;
    private int ySpeed = 1;

    private Board board;

    public Ball(Board board) {
        this.board = board;
        y = board.paddle.getTopY() - DIAMETER;
        x = board.getPreferredSize().width / 2 - DIAMETER / 2;
    }

    public void move() {

        if (x > board.getWidth() - DIAMETER || x < 0) {
            xSpeed = -xSpeed;
        }

        if (y < 15) {
            ySpeed = -ySpeed;
        }

        if (y > board.getHeight() - DIAMETER) {
            board.gameOver();
        }

        //entre nesta if quando uma colisão é detectada
        if (collision()) {
            y = board.paddle.getTopY() - DIAMETER;
        }

        x += xSpeed;
        y += ySpeed;
    }

    public void setSpeed(int speed) {
        this.xSpeed = speed;
        this.ySpeed = speed;
    }

    public void paint(Graphics2D g2) {
        g2.fillOval(x, y, DIAMETER, DIAMETER);
    }

    public boolean collision() {
        //detecta colisão entre a area da bola e o paddle
        return board.paddle.getBounds().intersects(this.getBounds());
    }

    public Rectangle getBounds() {
        return new Rectangle(x, y, DIAMETER, DIAMETER);
    }
}

The result so far:

Onlywhentheballareacollideswiththepaddle'scorner,itcontinuesthetrajectoryofthex-axis,andtosimulatemorerealphysics,IwouldliketobeabletodetectwhenthecollisionoccursattheendsoftheobjectsandinvertthetrajectoryoftheXaxisoftheball.HowdoIdetectthis?

Sincethereare4differentbigclasses,soasnottomessupthequestion,Iputafullyexecutableandcompleteexampleofthecodeinthe gist .