问在用Java为MenuScreen制作按钮时需要帮助

EN

 package com.vescorspel.game.MyFirstGame.states;

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

import com.vescorspel.game.MyFirstGame.Handler;
import com.vescorspel.game.MyFirstGame.gfx.Assets;

public class MenuState extends State{
// Resizing my button from 64 pixels to 256 pixels
public static final int ButtonWidth = 256;
public static final int ButtonHeight = 256;

// coordinates where my buttons are placed in pixels ;)
public static final int PlayButtonX = 500;
public static final int PlayButtonY = 100;
public static final int ExitButtonX = 500;
public static final int ExitButtonY = 400;

public MenuState(Handler handler){
	super(handler);
}

// My tick method
@Override
public void tick() {
	//This If statement tells my game if I LeftClicked anywhere in the MenuScreen, then it send me to my GameState(GameScreen)
	if(handler.getMouseManager().isLeftPressed())
		State.setState(handler.getGame().gameState);;
}


//My render where i render the button pictures in my MenuScreen
@Override
public void render(Graphics g) {
	//PlayButton from my Assets class(this is an image)
    g.drawImage(Assets.PlayButton, PlayButtonX, PlayButtonY, ButtonWidth, ButtonHeight, null );
    //ExitButton from my Assets class(this is an image)
    g.drawImage(Assets.ExitButton, ExitButtonX, ExitButtonY, ButtonWidth, ButtonHeight, null);
    //these 2 commands tells my game to make a red cube and follow my mouse in the MenuScreen
    g.setColor(Color.RED);
    g.fillRect(handler.getMouseManager().getMouseX(), handler.getMouseManager().getMouseY(), 8, 8);
}
}

package com.vescorspel.game.MyFirstGame.input;

import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;

public class MouseManager implements MouseListener, MouseMotionListener{
	private boolean leftPressed;
	private int mouseX, mouseY;

	public MouseManager(){
	}

	//Getters

	public boolean isLeftPressed(){
	    return leftPressed;
	}

	public int getMouseX(){
	    return mouseX;
	}

	public int getMouseY(){
	    return mouseY;
	}

	// Implemented methods
    
	@Override
	public void mousePressed(MouseEvent e) {
		if(e.getButton() == MouseEvent.BUTTON1)
			leftPressed = true;
	}

	@Override
	public void mouseReleased(MouseEvent e) {
	    if(e.getButton() == MouseEvent.BUTTON1)
	        leftPressed = false;
	}

	@Override
	public void mouseMoved(MouseEvent e) {
	    mouseX = e.getX();
	    mouseY = e.getY();
	}

	@Override
	public void mouseDragged(MouseEvent e) {
	    // TODO Auto-generated method stub

	}

	@Override
	public void mouseClicked(MouseEvent e) {
	}

	@Override
	public void mouseEntered(MouseEvent e) {
	    // TODO Auto-generated method stub

	}

	@Override
	public void mouseExited(MouseEvent e) {
	    // TODO Auto-generated method stub
	}

}