Java - NotSerializableException

Question

我正在牆上碰撞我的頭。

這裏的交易：我做了一個BlockList類，我創建了一個塊列表。這個類是序列化的，Block類也是（也是我在Block類中使用的類RGB）。

因此，當我嘗試使用ObjectOutputStream將二進制文件保存到列表中時，一切正常。

但是，當我嘗試讀取文件時，我得到這個NotSerializable異常。我的意思是，列表中可能包含的所有類都是可序列化的。爲什麼我甚至會得到這個錯誤？

public void saveToHardDrive(){ 
    try{ 
     FileOutputStream fos = new FileOutputStream("blocks.bk", true); 
     ObjectOutputStream oos = new ObjectOutputStream(fos); 
     oos.writeObject(list); 
     oos.close(); 
    }catch(IOException e){ 
     System.out.println("ERREUR : erreur lors de la sauvegarde."); 
    } 
} 

public void loadFromHardDrive(){ 
    try { 
     FileInputStream fis = new FileInputStream("blocks.bk"); 
     ObjectInputStream ois = new ObjectInputStream(fis); 
     list = (ArrayList<Block>) ois.readObject(); 
     ois.close(); 
     fis.close(); 
    } catch (FileNotFoundException e) { 
     e.printStackTrace(); 
    } catch (IOException e) { 
     e.printStackTrace(); 
    } catch (ClassNotFoundException e) { 

     e.printStackTrace(); 
    } 
} 

如果有人能找到，我欠你一輩子。

PS：even weirder：當我嘗試加載文件時，該錯誤也提到了保存功能...即使我評論了所有的函數。

java.io.WriteAbortedException: writing aborted; java.io.NotSerializableException: vector.Block 
at java.io.ObjectInputStream.readObject0(Unknown Source) 
at java.io.ObjectInputStream.readObject(Unknown Source) 
at java.util.ArrayList.readObject(Unknown Source) 
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) 
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) 
at java.lang.reflect.Method.invoke(Unknown Source) 
at java.io.ObjectStreamClass.invokeReadObject(Unknown Source) 
at java.io.ObjectInputStream.readSerialData(Unknown Source) 
at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source) 
at java.io.ObjectInputStream.readObject0(Unknown Source) 
at java.io.ObjectInputStream.readObject(Unknown Source) 
at vector.BlockList.loadFromHardDrive(BlockList.java:60) 
at vector.main.file(main.java:184) 
at vector.Controls.Controls(Controls.java:57) 
at vector.main.gameLoop(main.java:111) 
at vector.main.main(main.java:171) 

Caused by: java.io.NotSerializableException: vector.Block 
at java.io.ObjectOutputStream.writeObject0(Unknown Source) 
at java.io.ObjectOutputStream.writeObject(Unknown Source) 
at java.util.ArrayList.writeObject(Unknown Source) 
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) 
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) 
at java.lang.reflect.Method.invoke(Unknown Source) 
at java.io.ObjectStreamClass.invokeWriteObject(Unknown Source) 
at java.io.ObjectOutputStream.writeSerialData(Unknown Source) 
at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source) 
at java.io.ObjectOutputStream.writeObject0(Unknown Source) 
at java.io.ObjectOutputStream.writeObject(Unknown Source) 
at vector.BlockList.saveToHardDrive(BlockList.java:51) 
at vector.main.file(main.java:189) 
at vector.Controls.Controls(Controls.java:57) 
at vector.main.gameLoop(main.java:113) 
at vector.main.main(main.java:173) 

編輯：這裏是塊類：

public class Block implements Serializable{ 
private float x; 
private float y; 
private float height; 
private float length; 
private RGB color; 

public Block(float x, float y){ 
    this.x = x; 
    this.y = y; 
    length = 100; 
    height = 100; 
    color = new RGB(1, 1, 1); 
} 

public Block(Player p){ 
    setX(p.getX()); 
    setY(p.getY()); 
    setHeight(p.getHeight()); 
    setLength(p.getLength()); 
    setColor(new RGB(1, 1, 1)); 
} 

public void render() { 
    Quad.renderQuad(this); 
} 

和RGB以防萬一：

public class RGB implements Serializable{ 
float r, g, b; 

public RGB(float R, float G, float B){ 
    r=R;g=G;b=B; 
} 
public String toString(){ 
    return (r*250) + ", " + (g*250) + ", " + (b*250); 
} 

}

Answer 1

在創建vector.Block Serializable之前創建了該文件。你必須重新創建它。

Answer 2

應該被序列化的所有類，必須實現Serializable -接口。