好的，我想制作乒乓球，我有基本的代码，但我想添加一个选项来改变桨的颜色
Main.Java:
import java.awt.*;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.*;
public class Main extends JFrame {
int x, y;
//Double buffering
Image dbImage;
Graphics dbg;
Image Ball;
boolean GameStarted = false;
boolean options = false;
boolean p1colouroption = false;
boolean p2colouroption = false;
boolean p1red = false;
boolean p2red = false;
boolean p1white = true;
boolean p2white = true;
boolean p1yellow = false;
boolean p2yellow = false;
boolean p1green = false;
boolean p2green = false;
//Ball objects
static Ball b = new Ball(193, 143);
static Ball b1 = new Ball(193, 143);
Thread ball = new Thread(b);
Thread p1 = new Thread(b.p1);
Thread p2 = new Thread(b.p2);
//Menu Buttons
Rectangle Options = new Rectangle (150, 200, 100, 25);
Rectangle Player1colour = new Rectangle (150,150,100,25);
Rectangle Player2colour = new Rectangle (150,100,100,25);
Rectangle startButton = new Rectangle(150, 150, 100, 25);
Rectangle HBstartButton = new Rectangle(368, 200, 50, 100);
Rectangle P1red = new Rectangle (150,75,100,25);
Rectangle P2red = new Rectangle (150,75,100,25);
Rectangle P1white = new Rectangle (150,125,100,25);
Rectangle P2white = new Rectangle (150,125,100,25);
Rectangle P1yellow = new Rectangle (150,175,100,25);
Rectangle P2yellow = new Rectangle (150,175,100,25);
Rectangle P1green = new Rectangle (150,225,100,25);
Rectangle P2green = new Rectangle (150,225,100,25);
//Variables for screen size
int
GWIDTH = 400,
GHEIGHT = 300;
//Dimension of GWIDTH*GHEIGHT
Dimension screenSize = new Dimension(GWIDTH, GHEIGHT);
int setY;
//Create constructor to spawn window
public Main(){
ImageIcon i = new ImageIcon("F:/pong/src/ballpic.png");
Ball = i.getImage();
this.setTitle("Pong");
this.setSize(screenSize);
this.setResizable(false);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setVisible(true);
this.setBackground(Color.BLACK);
this.addKeyListener(new KeyHandler());
this.addMouseListener(new MouseHandler());
this.addMouseMotionListener(new MouseHandler());
this.setLocationRelativeTo(null);
x= 370;
y = 140;
}
public static void main(String[] args){
Main m = new Main();
}
public void StartGame(){
GameStarted = true;
ball.start();
p1.start();
p2.start();
}
public void PauseGame(){
GameStarted = false;
options = false;
p1colouroption = false;
p2colouroption = false;
}
public void Buttonpressed(){
options = false;
p1colouroption = false;
p2colouroption = false;
}
@Override
public void paint(Graphics g){
dbImage = createImage(getWidth(), getHeight());
dbg = dbImage.getGraphics();
draw(dbg);
g.drawImage(dbImage, 0, 0, this);
}
public void draw(Graphics g){
//Menu
if(!GameStarted){
if(p1colouroption){
g.setColor(Color.RED);
g.fillRect(P1red.x, P1red.y, P1red.width, P1red.height);
g.setFont(new Font("Arial", Font.BOLD, 12));
g.setColor(Color.BLACK);
g.drawString("Red", P1red.x+10, P1red.y+15);
g.setColor(Color.WHITE);
g.fillRect(P1white.x,P1white.y,P1white.width,P1white.height);
g.setColor(Color.BLACK);
g.drawString("White",P1white.x+10, P1white.y+15);
g.setColor(Color.YELLOW);
g.fillRect(P1yellow.x,P1yellow.y,P1yellow.width,P1yellow.height);
g.setColor(Color.BLACK);
g.drawString("Yellow", P1yellow.x+10, P1yellow.y+15);
g.setColor(Color.GREEN);
g.fillRect(P1green.x, P1green.y, P1green.width, P1green.height);
g.setColor(Color.BLACK);
g.drawString("Green", P1green.x+10, P1green.y+15);
}
else{
if(options){
g.setColor(Color.white);
g.fillRect(Player1colour.x, Player1colour.y, Player1colour.width, Player1colour.height);
g.setFont(new Font("Arial", Font.BOLD, 12));
g.setColor(Color.BLACK);
g.drawString("Player 1 Colour", Player1colour.x+10, Player1colour.y+15);
g.setColor(Color.WHITE);
g.fillRect(Player2colour.x, Player2colour.y, Player2colour.width, Player2colour.height);
g.setColor(Color.BLACK);
g.drawString("Player 2 Colour", Player2colour.x+10, Player2colour.y+15);
}
else{
g.setFont(new Font("Arial", Font.BOLD, 26));
g.setColor(Color.WHITE);
g.drawString("Pong", 165, 75);
g.setColor(Color.WHITE);
g.fillRect(startButton.x, startButton.y, startButton.width, startButton.height);
g.setFont(new Font("Arial", Font.BOLD, 12));
g.setColor(Color.BLACK);
g.drawString("Start Game", startButton.x+20, startButton.y+17);
g.setColor(Color.WHITE);
g.fillRect(Options.x, Options.y, Options.width, Options.height);
g.setColor(Color.BLACK);
g.drawString("Options", Options.x+17, Options.y+20);
}
}
}
else{
//Game drawings
b.draw(g);
if(p1red){
g.setColor(Color.red);
b.p1.draw(g);
}
else{
b.p1.draw(g);
}
b.p2.draw(g);
//Scores
g.setColor(Color.WHITE);
g.drawString(""+b.p1Score, 125, 50);
g.drawString(""+b.p2Score, 300, 50);
}
repaint();
}
////////EVENT LISTENER CLASSES/////////
public class KeyHandler extends KeyAdapter {
int y;
@Override
public void keyPressed(KeyEvent e){
b.p1.keyPressed(e);
b.p2.keyPressed(e);
if(e.getKeyCode() == e.VK_P)
PauseGame();
}
public void keyReleased(KeyEvent e){
b.p1.keyReleased(e);
b.p2.keyReleased(e);
}
}
///////END EVENT LISTENER CLASSES/////
public class MouseHandler extends MouseAdapter {
@Override
public void mouseMoved(MouseEvent e){
}
@Override
public void mousePressed(MouseEvent e){
int mx = e.getX();
int my = e.getY();
if(!options){
if(mx > startButton.x && mx < startButton.x+startButton.width &&
my > startButton.y && my < startButton.y+startButton.height){
StartGame();
}
if(mx > Options.x && mx < Options.x+Options.width &&
my > Options.y && my < Options.y+Options.height){
options = true;
}
}
else{
if(mx > Player1colour.x && mx < Player1colour.x+Player1colour.width &&
my > Player1colour.y && my < Player1colour.y+Player1colour.height){
p1colouroption = true;
}
}
if(p1colouroption){
if(mx > P1red.x && mx < P1red.x+P1red.width &&
my > P1red.y && my < P1red.y+P1red.height){
p1red = true;
p1green = false;
p1yellow = false;
p1white = false;
Buttonpressed();
}
}
}
}
}
Paddle.java：
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Rectangle;
import java.awt.event.KeyEvent;
public class Paddle implements Runnable {
int x, y, yDirection, id;
boolean p1red = false;
boolean p2red = false;
boolean p1white = true;
boolean p2white = true;
boolean p1yellow = false;
boolean p2yellow = false;
boolean p1green = false;
boolean p2green = false;
Rectangle paddle;
public Paddle(int x, int y, int id){
this.x = x;
this.y = y;
this.id = id;
paddle = new Rectangle(x, y, 10, 50);
}
public void keyPressed(KeyEvent e){
switch(id){
default:
System.out.println("Please enter a valid ID in Paddle constructor");
break;
case 1:
if(e.getKeyCode() == e.VK_W){
setYDirection(-1);
}
if(e.getKeyCode() == e.VK_S){
setYDirection(1);
}
break;
case 2:
if(e.getKeyCode() == e.VK_UP){
setYDirection(-1);
}
if(e.getKeyCode() == e.VK_DOWN){
setYDirection(+1);
}
break;
}
}
public void keyReleased(KeyEvent e){
switch(id){
default:
System.out.println("Please enter a valid ID in Paddle constructor");
break;
case 1:
if(e.getKeyCode() == e.VK_W){
setYDirection(0);
}
if(e.getKeyCode() == e.VK_S){
setYDirection(0);
}
break;
case 2:
if(e.getKeyCode() == e.VK_UP){
setYDirection(0);
}
if(e.getKeyCode() == e.VK_DOWN){
setYDirection(0);
}
break;
}
}
public void setYDirection(int ydir){
yDirection = ydir;
}
public void move(){
paddle.y += yDirection;
if(paddle.y <= 15)
paddle.y = 225;
if(paddle.y >= 250)
paddle.y = 25;
}
public void draw(Graphics g){
switch(id){
default:
System.out.println("Please enter a valid ID in Paddle constructor");
break;
case 1:
if(p1white){
g.setColor(Color.white);
}
if(p1green){
g.setColor(Color.green);
}
if(p1red){
g.setColor(Color.red);
}
if(p1yellow){
g.setColor(Color.yellow);
}
g.fillRect(paddle.x, paddle.y, paddle.width, paddle.height);
break;
case 2:
if(p2white){
g.setColor(Color.white);
}
if(p2green){
g.setColor(Color.green);
}
if(p2red){
g.setColor(Color.red);
}
if(p2yellow){
g.setColor(Color.yellow);
}
g.fillRect(paddle.x, paddle.y, paddle.width, paddle.height);
break;
}
}
@Override
public void run() {
try{
while(true){
move();
Thread.sleep(8);
}
}catch(Exception e){System.err.println(e.getMessage());}
}
}
所以无论如何我可以在main.java中获取boolean来触发paddle.java中的布尔值
答案 0 :(得分：0)
使布尔公共， 然后只需访问它。 例如：
public class Example{
public boolean test;
public Example(){
test = false;
}
}
public class Main{
public static void main(){
Example = new Example();
example.test = true;
}
}
答案 1 :(得分：0)
你可以这样做。很简单：
public class Main extends JFrame {
public boolean p1red = false;
public boolean p2red = false;
}
并且，从您的主题中，像这样调用p1red和p2red：
public class Paddle implements Runnable
{
boolean foo;
//...
foo = Main.p1red;
}
您不需要在线程中创建新的Main（）类。只需从您的代码中调用Main.p1red即可访问。