英文:
Error while creating array of BufferedImage in java
问题
import java.awt.image.BufferedImage;import javax.imageio.ImageIO;import java.io.IOException;public class ImageLoader {public static BufferedImage loadImage(String path) {try {return ImageIO.read(ImageLoader.class.getResource(path));} catch (IOException e) {e.printStackTrace();System.exit(1);}return null;}}public class Assets {BufferedImage BackgroungImage, PlayerSprite, Enemy1, Enemy2, Enemy3, Enemy4;BufferedImage[] EnemySprites = new BufferedImage[4];public static void init() {BackgroundImage = ImageLoader.loadImage("/Assets/Images/BG.jpg");PlayerSprite = ImageLoader.loadImage("/Assets/Sprites/WaveRider.png");Enemy1 = ImageLoader.loadImage("/Assets/Sprites/Enemy1.png");Enemy2 = ImageLoader.loadImage("/Assets/Sprites/Enemy2.png");Enemy3 = ImageLoader.loadImage("/Assets/Sprites/Enemy3.png");Enemy4 = ImageLoader.loadImage("/Assets/Sprites/Enemy4.png");EnemySprites = new BufferedImage[]{Enemy1, Enemy2, Enemy3, Enemy4};}}
英文:
import java.awt.image.BufferedImage;import javax.imageio.ImageIO;import java.io.IOException;public class ImageLoader {public static BufferedImage loadImage(String path){try {return ImageIO.read(ImageLoader.class.getResource(path));} catch(IOException e) {e.printStackTrace();System.exit(1);}return null;}}public class Assets {BufferedImage BackgroungImage, PlayerSprite, Enemy1, Enemy2, Enemy3, Enemy4;BufferedImage[] EnemySprites = new BufferedImage[4];public static void init(){BackgroundImg = ImageLoader.loadImage("/Assets/Images/BG.jpg");PlayerSprite = ImageLoader.loadImage("/Assets/Sprites/WaveRider.png");Enemy1 = ImageLoader.loadImage("/Assets/Sprites/Enemy1.png");Enemy2 = ImageLoader.loadImage("/Assets/Sprites/Enemy2.png");Enemy3 = ImageLoader.loadImage("/Assets/Sprites/Enemy3.png");Enemy4 = ImageLoader.loadImage("/Assets/Sprites/Enemy4.png");EnemySprites = {Enemy1, Enemy2, Enemy3, Enemy4};}}
I have been trying to create an array of BufferedImage using the code above but I am getting the error bellow.I am getting the same type of errors for all the variables I am trying to store in the array. I can not trace the errors in the code. I tried assigning the values of the array while declaring but it also gave me the same errors.
Assets.java:19: error: illegal start of expressionEnemySprites = {Enemy1, Enemy2, Enemy3, Enemy4};^Assets.java:19: error: not a statementEnemySprites = {Enemy1, Enemy2, Enemy3, Enemy4};^Assets.java:19: error: ';' expectedEnemySprites = {Enemy1, Enemy2, Enemy3, Enemy4};^Assets.java:19: error: not a statementEnemySprites = {Enemy1, Enemy2, Enemy3, Enemy4};^Assets.java:19: error: ';' expectedEnemySprites = {Enemy1, Enemy2, Enemy3, Enemy4};^^
答案1
得分: 1
问题1： 需要注意的是，使用 {"literal", "array", "value"} 进行数组初始化只允许在定义时内联进行，也就是在你定义数组时进行。
你需要像这样进行初始化：new YourType[]{这里是值..};。
问题2： 需要注意的是，所有这些变量：
BackgroungImage、PlayerSprite、Enemy1、Enemy2、Enemy3、Enemy4;
都是实例（非静态）字段，而你正试图从静态上下文中引用它们，但你不能这样做，因为实例成员属于实例，而静态成员属于类。
你可以选择：
- 创建一个 Assets 的新实例并访问该实例的成员；
- 将你的字段定义为静态的。
问题3：
我也认为这是一个问题：请不要为类成员的命名使用帕斯卡命名法（嵌套类除外）。
英文:
You have several problems in your code.
Problem 1: Note, also, that array initialization with the {"literal", "array", "value"} is only allowed inline with the definition, i.e. when you define your array.
You will have to initialize it like: new YourType[]{values here..};.
Problem 2: Note, that all these variables:
BackgroungImage, PlayerSprite, Enemy1, Enemy2, Enemy3, Enemy4;
are Instance(non-static) fields, and you are trying to refer them from a Static Context, which you cannot do as instance member belongs to instance, and static member belongs to the class.
You can do either:
- create a new instance of Assets and access the members of that instance;
- define your fields as static.
Problem 3:
I will call this a problem as well: Please, do NOT use PascalCase for naming your class members (except for nested classes).
答案2
得分: 0
为什么不尝试使用索引进行赋值？
EnemySprites[0] = Enemy1;
...
...
EnemySprites[3] = Enemy4;
英文:
Why don't you try assignments with indices?
EnemySprites[0] = Enemy1;....EnemySprites[3] = Enemy4;
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