小编Mou*_*don的帖子

我收到“无法编译的源代码 - 错误的树类型”错误和“找不到符号”错误我关闭了保存时编译，现在找不到符号。似乎破坏它的区域是我在 AsteroidFields 生成方法中初始化 Asteroid() 的地方，所以我觉得我的初始化不正确，但我无法弄清楚如何实现。

package asteroidfield;
import java.util.TreeSet;
import blobzx.BlobGUI;
import blobzx.SandBox;
import blobzx.SandBoxMode;



public class AsteroidField implements BlobGUI {

    SandBox ast;

    public static void main (String [] Args){
        new AsteroidField();       
    }

    public AsteroidField (){
        ast = new SandBox();

        ast.setSandBoxMode(SandBoxMode.FLOW);   
        ast.setFrameRate(15);
        ast.init(this);

    }

    @Override
    public void generate() {
       // This is the line that is breaking the code.   
         Asteroid asteroid = new Asteroid();

    }

}








    package AsteroidField;

    import blobzx.BlobUtils;
    import blobzx.PolyBlob;
    import java.awt.Point;


    import java.util.Random;


    public class …