Java की Advanced Serialization

import java.io.*;
public class Main {
	static class User implements Serializable { // marker interface -- tells the JVM it's safe to serialize
		String name = "Riya";
	}
	public static void main(String[] args) throws Exception {
		ByteArrayOutputStream bos = new ByteArrayOutputStream();
		new ObjectOutputStream(bos).writeObject(new User());
		System.out.println("Serialized to " + bos.size() + " bytes");
	}
}

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import java.io.*;
public class Main {
	static class User implements Serializable {
		String name = "Riya";
		transient String password = "secret"; // skipped entirely during serialization
	}
	public static void main(String[] args) throws Exception {
		ByteArrayOutputStream bos = new ByteArrayOutputStream();
		new ObjectOutputStream(bos).writeObject(new User());
		ObjectInputStream in = new ObjectInputStream(new ByteArrayInputStream(bos.toByteArray()));
		User restored = (User) in.readObject();
		System.out.println(restored.name + " " + restored.password); // password is null after restore
	}
}

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import java.io.*;
public class Main {
	static class User implements Serializable {
		static final long serialVersionUID = 1L; // verified against the byte stream at deserialization
		String name = "Riya";
	}
	public static void main(String[] args) {
		System.out.println("serialVersionUID = " + User.serialVersionUID);
	}
}

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import java.io.*;
public class Main {
	static class User implements Serializable {
		String name = "Riya";
		private void writeObject(ObjectOutputStream out) throws IOException {
			out.defaultWriteObject();
			out.writeObject(name.toUpperCase()); // custom encoding logic
		}
	}
	public static void main(String[] args) throws Exception {
		ByteArrayOutputStream bos = new ByteArrayOutputStream();
		new ObjectOutputStream(bos).writeObject(new User());
		System.out.println("Custom writeObject() ran, " + bos.size() + " bytes written");
	}
}

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import java.io.*;
public class Main {
	static class User implements Externalizable {
		String name = "Riya";
		public User() {}
		public void writeExternal(ObjectOutput out) throws IOException {
			out.writeUTF(name); // fully manual control, no default reflective serialization
		}
		public void readExternal(ObjectInput in) throws IOException {
			name = in.readUTF();
		}
	}
	public static void main(String[] args) throws Exception {
		ByteArrayOutputStream bos = new ByteArrayOutputStream();
		new ObjectOutputStream(bos).writeObject(new User());
		System.out.println("Externalizable wrote " + bos.size() + " bytes manually");
	}
}

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