Java：关键字“this”和序列化

Question

我有一个简单的类，如下所示

我想用这个类实现的就是将实例序列化为字节数组，但我一直得到java.io.NotSerializableException

我的代码怎么了

这只是指向调用构造函数时创建的实例的指针，而不是实际的实例对象吗

class XXX {
  private String someStr;

  public XXX(String someStr){
    this.someStr = someStr;
  }

  public byte[] toByteArray(){
        byte[] output = null;
        try(ByteArrayOutputStream out = new ByteArrayOutputStream(); 
        ObjectOutputStream stream = new ObjectOutputStream(out)) {
            stream.writeObject(this);
            output = out.toByteArray();
        }catch(Exception e){
        }
        return output;
    }

}

XXX aX = new XXX("some string");
aX.toByteArray();

Answer 1

从NotSerializableException

Thrown when an instance is required to have a Serializable interface. The serialization runtime or the class of the instance can throw this exception. The argument should be the name of the class.

您需要在类中实现可序列化接口

class XXX implements Serializable {
 ...
}

请参见此处的输出ideone.com

[-84, -19, 0, 5, 115, 114, 0, 6, 73, 100, 101, 111, 110, 101, 107, -60, 36, 124, 45, 63, 13, 80, 2, 0, 1, 76, 0, 7, 115, 111, 109, 101, 83, 116, 114, 116, 0, 18, 76, 106, 97, 118, 97, 47, 108, 97, 110, 103, 47, 83, 116, 114, 105, 110, 103, 59, 120, 112, 116, 0, 11, 115, 111, 109, 101, 32, 115, 116, 114, 105, 110, 103]