从一个班级获得价值

Question

private void update(float delta) {

    playerRectangle.setPosition(getX() + velocity.x * delta, 300);

    setX(getX() + velocity.x * delta);

}

So let's say I have the above method in ClassA but I want to use

playerRectangle.setPosition(getX() + velocity.x * delta, 300);

for ClassB, however, delta would not defined in ClassB, so I was wondering how would I get the delta value?

*I made getter methods for velocity and playerRectangle in ClassA

public class Player extends Sprite implements InputProcessor{

private Vector2 velocity;
private float speed = 500;
private Rectangle playerRectangle, rightRectangle, leftRectangle;

public Player(Sprite sprite){
    super(sprite);
    playerRectangle = new Rectangle(0,0,286,160);
    rightRectangle = new Rectangle(1280,0,0,720);
    leftRectangle = new Rectangle(0,0,0,720);
    velocity = new Vector2(0,0);

}

public void draw(SpriteBatch spriteBatch){
    update(Gdx.graphics.getDeltaTime());
    super.draw(spriteBatch);
}

private void update(float delta) {

    playerRectangle.setPosition(getX() + velocity.x * delta, 300);

    setX(getX() + velocity.x * delta);

}

public Rectangle getPlayerRectangle(){
    return playerRectangle;
}

public Rectangle getRightRectangle(){
    return rightRectangle;
}

public Rectangle getLeftRectangle(){
    return leftRectangle;
}

public Vector2 getVelocity(){
    return velocity;
}

Answer 1

This will do

ClassA obj= new ClassA();
obj.playerRectangle.setPosition(obj.getX() + obj.velocity.x * obj.delta, 300);

this will only work if all the functions and objects( ie; getx(),velocity.x,delta ) are all public.

Answer 2

Include a setPlayerRectangle method in your Player class

public void setPlayerRectangle(Rectangle rectangleObject){
    playerRectangle= rectangleObject;
}

Then

Player playerObj = new Player(spriteObject);
....
....
// Create a new Rectangle object with/without arguments as per your need
Rectangle yourRectangle = new Rectangle();
yourRectangle.setPosition(getX() + playerObj.getVelocity().x *deltaValue, 300);

You didn't mention where is the getX() method defined, if its in the Player class, then write playerObj.getX().. and then set it to playerObj

playerObj.setPlayerRectangle(yourRectangle);