如果包含“对象”字段，如何使类可序列化

Question

public class A implements Serializable
{
    private static final long serialVersionUID = 1L;
    private Object value;
    private Type type;
....
}

It includes "Object" which is not serializable, so class A will be rendered as not serializable.

"Object value" could be Integer, String..., depending on "Type type"

How to make A serializable? Thanks in advance!

EDIT: Will "Object value" get lost (when de-serialing) if using "private transient Object value"? I don't want to lost it.

Is there a general serializable Object type?

Answer 1

"Object value" could be Integer, String...

Integer and String are both serializable. It will work. You don't need to do anything special to serialize them.

Is there a general serializable Object type?

Yeah, Serializable:

private Serializable value;

Answer 2

您可以使用transient关键字跳过字段的序列化：

private transient Object value;

Answer 3

transient keyword servers that purpose

private transient Object value;

Other way is to make the Object static if it does not represent your instance. static variables are implicitly transient .

Will "Object value" get lost (when de-serialing) if using "private transient Object value"? I don't want to lost it.

If you do not serialize the variable its values will be lost. Serialization saves the state of instance of a class. When the instance will be deserialized it will have Object value in it but it will be initialized to the default value ie null. So yes the value will be lost which is anyway the purpose of making a variable transient.