package io.acari.pojo;

import java.io.Externalizable;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectOutput;
import java.util.ArrayList;
import java.util.List;

public class ExternalizableProgrammer implements Externalizable {
    private static final long serialVersionUID = 6757860161913660513L;
    public static final int NULL_LIST = -1;
    private String name;
    private int age;
    private ExternalizableComputer computer;
    private List<String> languages;

    @Override
    public void writeExternal(ObjectOutput out) throws IOException {
        out.writeUTF(name);
        out.writeInt(age);
        int size = languages == null ? NULL_LIST : languages.size();
        out.writeInt(size);

        for (int i = 0; i < size; ++i) {
            out.writeUTF(languages.get(i));
        }
        computer.writeExternal(out);
    }

    @Override
    public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
        name = in.readUTF();
        age = in.readInt();
        int size = in.readInt();
        if (size > NULL_LIST) {
            languages = new ArrayList<>(size);
            for (int i = 0; i < size; ++i) {
                languages.add(i, in.readUTF());
            }
        }
        computer = new ExternalizableComputer();
        computer.readExternal(in);
    }
    
    //ACCESSOR METHODS OMITTED

}

package io.acari.pojo;

import java.io.Externalizable;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectOutput;

public class ExternalizableComputer implements Externalizable {
    private static final long serialVersionUID = -6235153548793669030L;
    private String model;
    private String subModel;
    private int ram;
    private String make;

    @Override
    public void writeExternal(ObjectOutput objectOutput) throws IOException {
        objectOutput.writeUTF(model);
        objectOutput.writeUTF(subModel);
        objectOutput.writeInt(ram);
        objectOutput.writeUTF(make);
    }

    @Override
    public void readExternal(ObjectInput objectInput) throws IOException, ClassNotFoundException {
        model = objectInput.readUTF();
        subModel = objectInput.readUTF();
        ram = objectInput.readInt();
        make = objectInput.readUTF();
    }
    
    //ACCESSOR METHODS OMMITTED
}