我想用javaFX写一个Snake游戏，但有一个例外，我不知道，我想知道如何解决它。 （我知道它尚未完成）
我想知道，扩展Application的类（带启动覆盖） 正是其他程序的主要内容？ 正如你所看到的，这里并不是我所不需要的静态无效主要BC，但是如果我想在我所做的地方添加main？
它是执行...
Exception in Application constructor
Exception in thread "main" java.lang.NoSuchMethodException: Main_Snake.main([Ljava.lang.String;)
at java.lang.Class.getMethod(Class.java:1819)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:125)
我的代码是：
import javafx.animation.AnimationTimer;
import javafx.application.Application;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.canvas.Canvas;
import javafx.scene.canvas.GraphicsContext;
import javafx.scene.input.KeyEvent;
import javafx.scene.layout.BorderPane;
import javafx.scene.paint.Color;
import javafx.stage.Stage;
import java.util.ArrayList;
/**
* Created by Nadia on 1/5/2016.
*/
public class Main_Snake extends Application{
Snake snake = new Snake();
Apple apple = new Apple();
Canvas canvas = new Canvas(800, 600);
boolean goNorth = true, goSouth, goWest, goEast;
int x, y = 0; // marbut be apple
boolean j = false;
// int gm_ov = 0; // vase game over shodan
ArrayList<Integer> X = new ArrayList<Integer>();
ArrayList<Integer> Y = new ArrayList<>();
@Override
public void start(Stage primaryStage) throws Exception {
BorderPane b = new BorderPane(canvas);
Scene scene = new Scene(b, 800, 600);
primaryStage.setScene(scene);
primaryStage.show();
//KeyBoard(scene);
scene.setOnKeyPressed(new EventHandler<KeyEvent>() {
@Override
public void handle(KeyEvent e) {
switch (e.getText()) {
case "w":
if (!goSouth) {
goNorth = true;
goSouth = false;
goWest = false;
goEast = false;
}
break;
case "s":
if (!goNorth) {
goSouth = true;
goNorth = false;
goWest = false;
goEast = false;
}
break;
case "a":
if (!goEast) {
goWest = true;
goEast = false;
goSouth = false;
goNorth = false;
}
break;
case "d":
if (!goWest) {
goEast = true;
goWest = false;
goSouth = false;
goNorth = false;
}
break;
}
}
});
play();
}
public void play(){
AnimationTimer timer = new AnimationTimer() {
private long lastUpdate = 0;
@Override
public void handle(long now) {
if (now - lastUpdate >= 40_000_000) { // payin avordane sor@
snake.pos_S(); // har bar mar rasm mishe bad az move va ye sib ba X,Y khodesh rasm mishe tu tabe move dar morede tabe Point hast
apple.pos_A();
apple.random_Pos();
snake.Move();
lastUpdate = now; // sor@
}
}
};
timer.start();
}
/* public void KeyBoard(Scene scene) {
}*/
}
class Apple extends Main_Snake {
public void random_Pos() {
if (j == false) { // ye sib bede ke ru mar nabashe ( rasmesh tu rasme )
do {
x = (int) (Math.random() * 790 + 1);
y = (int) (Math.random() * 590 + 1);
} while (X.indexOf(x) != -1 && Y.get(X.indexOf(x)) == y || x % 10 != 0 || y % 10 != 0);
/*inja aval chek kardam tu araylist x hast ya na ag bud sharte aval ok hala sharte do ke tu Y ham mibinim tu hamun shomare khune
y barabare y mast ag bud pas ina bar ham montabeghan va sharte dovom ham ok . 2 sharte akhar ham vase ine ke mare ma faghat mazrab
haye 10 and pas ta vaghti in se shart bargharare jahayie ke ma nemikhaym va hey jaye dg mide*/
j = true;
}
}
public void pos_A() {
GraphicsContext gc = canvas.getGraphicsContext2D();
gc.setFill(Color.BLACK);
gc.fillRect(x, y, 10, 10);
}
public void Point() {
if (X.get(0) == x && Y.get(0) == y) {
j = false;
}
}
}
class Snake extends Main_Snake {
Snake(){ //cunstructor
X.add(400);
Y.add(300);
X.add(400);
Y.add(310);
X.add(400);
Y.add(320);
X.add(400);
Y.add(330);
X.add(400);
Y.add(340);
}
public void pos_S(){
GraphicsContext gc = canvas.getGraphicsContext2D();
gc.setFill(Color.WHITE);
gc.fillRect(0, 0, canvas.getWidth(), canvas.getHeight());
apple.pos_A();
// keshidane mar (body yeki ezafe tar az adade morabaA mide)
for (int i = X.size() - 1; i >= 0; i--)
gc.fillRect(X.get(i), Y.get(i), 10, 10);
}
public void Move(){
int Px = X.get(X.size() - 1);
int Py = Y.get(Y.size() - 1);
for (int z = X.size() - 1 ; z > 0 ; z--){
X.remove(z);
X.add(z , X.get(z-1) ) ;
Y.remove(z);
Y.add(z , Y.get(z-1) ) ;
}
if (goNorth) {
Y.add(0 , Y.get(0) - 10);
Y.remove(1);
}
if (goSouth) {
Y.add(0 , Y.get(0) + 10);
Y.remove(1);
}
if (goEast) {
X.add(0 , X.get(0) + 10);
X.remove(1);
}
if (goWest) {
X.add(0 , X.get(0) - 10);
X.remove(1);
}
apple.Point(); // emtiaz gerefte
if ( j == false) {
X.add(Px);
Y.add(Py);
}
if ( X.get(0) > 790 ){
X.remove(0);
X.add(0 , 0);
}
if ( X.get(0) < 0 ){
X.remove(0);
X.add(0 , 800);
}
if ( Y.get(0) > 590 ){
Y.remove(0);
Y.add(0 , 0);
}
if ( Y.get(0) < 0 ){
Y.remove(0);
Y.add(0 , 600);
}
}
}
答案 0 :(得分：1)
标准Oracle Java Runtime Environment可以直接从命令行执行Application子类，即使它们不包含main方法也是如此。因此，假设您使用的是标准JRE，可以从命令行执行
java Main_Snake
它将运行（假设没有其他错误等）。
其他环境和大多数IDE都不支持此执行模式，因此如果您想在这些环境中运行（例如在Eclipse中运行），则需要启动main(...)方法您的JavaFX应用程序。所以只需添加
public static void main(String[] args) {
launch(args);
}
到Main_Snake班。