GameDev - Jumping Algorithm

Game.java

/*  
Initialize the variables
--------------------------

    private int jumpWidth = 0;
    private boolean jumpStatus = false;
    private int gravity = 2;
    private int jumpPower = 5;
    private boolean startJump = false;
*/


public void update() {
    if (keyboardInput.up.isPressed() == true) {
        if (keyboardInput.shift.isPressed() == true)
            y -= 6;
        else
            y--;
    }
    if (keyboardInput.down.isPressed() == true) {
        if (keyboardInput.shift.isPressed() == true)
            y += 6;
        else
            y++;
    }
    if (keyboardInput.left.isPressed() == true) {
        if (keyboardInput.shift.isPressed() == true)
            x -= 6;
        else
            x--;
    }

    if (keyboardInput.right.isPressed() == true) {
        if (keyboardInput.shift.isPressed() == true)
            x += 6;
        else
            x++;
    }

    if (keyboardInput.space.isPressed() == true) {
        if (jumpStatus != true && jumpWidth <= 0) {
            startJump = true;
            jumpStatus = true;
        }
    }

   /* Jump algorithm */

    if (startJump) {
        if (jumpStatus) {
            if (jumpWidth < jumpHeight) {
                System.out.println("y = " + y);
                jumpWidth += jumpPower + gravity;
                y -= jumpPower + gravity;
            }
            else if (jumpWidth >= jumpHeight) {
                jumpWidth += jumpPower + gravity;
                y -= jumpPower + gravity;
                jumpStatus = false;
            }
        }
        else if (!jumpStatus) {
            if (jumpWidth > 0) {
                System.out.println("y = " + y);
                jumpWidth -= jumpPower + gravity;
                y += jumpPower + gravity;
            }
            else if (jumpWidth <= 1) {
                jumpWidth -= jumpPower + gravity;
                y += jumpPower + gravity;
                startJump = false;
            }
        }
    }
}

What do i put for jumpHeight?