我真的迷失在这里。我有两个课程涉及这个问题。第一类是Application
类,第二类是GameManager
类。GameManager
类上有一个名为instantiate()
的方法,我想从Application
类调用它。
因此,我在Application
类中创建了GameManager
类的实例。我从那个实例调用了instantiate()
方法,但没有任何反应。
它应该将"Instantiating GameObject"
输出到控制台,但它没有发生。甚至一次都没有。更令人困惑的是GameManager
类中的renderGame()
方法确实被调用(出于测试目的,我让它输出GameManager
持有的gameobjects
量)。
以下是两个类:
应用类:
import javax.swing.*;
import java.awt.*;
import java.awt.image.BufferStrategy;
public class Application implements Runnable {
public static boolean isRunning;
GameManager manager = new GameManager();//CREATE AN INSTANCE OF THE GAME MANAGER
JFrame frame;
BufferStrategy buffer;
Graphics drawer;
Thread appThread;
public Application (JFrame frame, BufferStrategy buffer, Graphics drawer) {
this.frame = frame;
this.frame.setBackground(Color.WHITE);
this.buffer = buffer;
this.drawer = drawer;
}
public synchronized void startLoop () {
appThread = new Thread (this);
appThread.start();
isRunning = true;
GameLoop ();
}
public synchronized void endLoop () {
isRunning = false;
try {
appThread.join();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
void GameLoop() {
int targetFps = 60;
double timePerTick = 1000000000 / targetFps;
double delta = 0;
long now;
long lastTime = System.nanoTime();
while(isRunning) {//THIS IS A LOOP THAT REPEATEDLY CALLS UPDATE AND RENDER METHODS
now = System.nanoTime();
delta += (now - lastTime) / timePerTick;
lastTime = now;
if(delta >= 1) {
masterUpdate();
masterRender();
delta--;
}
}
System.out.println("STOPPED");
}
void masterUpdate () {
manager.updateGame();
}
void masterRender () {
manager.renderGame(drawer);//THIS IS WHERE THE RENDER METHOD IS CALLED
buffer.show();
drawer.dispose();
}
@Override
public void run() {
startLoop();
manager.instantiate();
}
}
游戏管理器类:
import java.awt.Graphics;
public class GameManager {
public static int currentGameObjectAmount = 0;
public static int maxGameObjects = 100;
Player[] sceneObjects = new Player[maxGameObjects];
public void instantiate () {
System.out.println("Instantiating GameObject");
sceneObjects[currentGameObjectAmount] = new Player(100, 100, 100);
currentGameObjectAmount++;
}
public void updateGame () {
}
public void renderGame (Graphics drawer) {
System.out.println(currentGameObjectAmount);
for(int i = 0; i != maxGameObjects; i++) {
sceneObjects[i].render(drawer);
}
}
}
控制台输出0
何时应该输出1
因为我调用了instantiate()
方法,该方法递增控制台正在推送的整数变量。运行它时会发生什么
PS:对不起,如果我的代码让你头疼,我不是真正的高级程序员。
基本问题就在这里...
@Override
public void run() {
startLoop();
manager.instantiate();
}
当您调用startLoop
时,这会阻止当前Thread
,直到isRunning
false
我建议将manager.instantiate()
移到startLoop()
以上.我也可以考虑使用某种start
和end
的方法,可以用来告诉经理Thread
已经开始或停止,但这只是我;)