Gravity. Player shakes when jumping because of contradicting velocity/

Newbie & Debugging Questions
#1

Hello my issue is that when my player jumps. There is a tiny but noticeable shake because of how Jumping and gravity is worked.

There are the variables concerning jumpping and gravity,


	private float gravity = 0.5f;
	private final double MAX_SPEED = 10;

And here a method called in the tick/update method for position. Standard 60 ticks/s.


public void getNextPosition() {
		x += velX;
		y += velY;                                               //Exhibit A
		tileCollision(gameState.getObject());
		if (falling || jumping) {
			velY += gravity;
			if (velY > MAX_SPEED) {
				velY = MAX_SPEED;
			}
		}

		if (right && left) {
			if (timeRight > timeLeft) {
				velX = 5;
			} else if (timeLeft > timeRight) {
				velX = -5;
			}
		} else if (right && !left) {
			velX = 5;
		} else if (left && !right) {
			velX = -5;
		} else if (!left && !right) {
			velX = 0;
		}

	}

And here is how my jump works


if (key == KeyEvent.VK_SPACE) {
			if(player.isJumping() == false){
				player.setVelY(-10);   //Exhibit C
				player.setJumping(true);
			}
			
		}

As you can see from code in the update method y += velY; is causing the problem because the jump sets velY to -10. And at the same time applying the gravity as well velY += gravity;

This is my first attempt at a game and I don’t know how to approach gravity another way.

Here is a github link the my eclipse project file.
https://github.com/andrevicencio21/onepiecegame
It’s still at the early stage so hopefully it’s easier to trace.
Menu Controls: Up and Down and Enter;

Game Controls:
A,D for left and right movement
Space for Jump