您要在课程外声明一个字段：
import java.awt.BorderLayout;import java.awt.Canvas;import java.awt.Dimension;import javax.swing.Jframe;public boolean running = false; /// <=============== invalid locationpublic class Game extends Canvas implements Runnable { // <==== class starts here private static final long serialVersionUID = 1L; public static final int WIDTH = 160; public static final int HEIGHT = WIDTH / 12 * 9; public static final int SCALE = 3; public static final String NAME = "Game"; ...它必须放在一个类中：
import java.awt.BorderLayout;import java.awt.Canvas;import java.awt.Dimension;import javax.swing.Jframe;public class Game extends Canvas implements Runnable { // <==== class starts here public boolean running = false; /// <=============== valid location private static final long serialVersionUID = 1L; public static final int WIDTH = 160; public static final int HEIGHT = WIDTH / 12 * 9; public static final int SCALE = 3; public static final String NAME = "Game"; ...
