Codes for users' update history

UserHistory.java

import java.util.ArrayList;
import java.util.Date;
import java.util.List;

/*

    {
      "_id": "507f1f77bcf86cd799439011",
      "user_id": "507f191e810c19729de860ea",
      "changes": [
        {
          "field": "name",
          "old_value": "Sezer",
          "new_value": "szrr"
        },
        {
          "field": "is_confirmed",
          "old_value": false,
          "new_value": true
        }
      ],
      "updated_at": "2020-05-18T14:10:30.000Z"
    }

*/

public class Main {
    public static void main(String[] args) {
        Change change1 = new Change("is_confirmed", false, true);
        Change change2 = new Change("name", "Sezer", "szRR");

        List<Change> updates = new ArrayList<>();
        updates.add(change1);
        updates.add(change2);

        Changes changes = new Changes("ID", "USERID", updates, new Date());

        for (var change : changes.getChanges()) {
            System.out.println("Field: " + change.getField().getClass().getName());

            System.out.println("Old value: " + change.getOldValue().getClass().getName());

            if (change.getOldValue() instanceof Boolean) {
                System.out.println("           Boolean detected!");
                boolean b = (Boolean) change.getOldValue();
                System.out.println("           " + b);
            }

            System.out.println("New value: " + change.getNewValue().getClass().getName());
        }
    }
}

class Change {
    private String field;
    private Object oldValue;
    private Object newValue;

    public Change(String field, Object oldValue, Object newValue) {
        this.field = field;
        this.oldValue = oldValue;
        this.newValue = newValue;
    }

    public String getField() {
        return field;
    }

    public void setField(String field) {
        this.field = field;
    }

    public Object getOldValue() {
        return oldValue;
    }

    public void setOldValue(Object oldValue) {
        this.oldValue = oldValue;
    }

    public Object getNewValue() {
        return newValue;
    }

    public void setNewValue(Object newValue) {
        this.newValue = newValue;
    }
}

class Changes {

    private String id;
    private String userId;
    private List<Change> changes;
    private Date updatedAt;

    public Changes(String id, String userId, List<Change> changes, Date updatedAt) {
        this.id = id;
        this.userId = userId;
        this.changes = changes;
        this.updatedAt = updatedAt;
    }

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getUserId() {
        return userId;
    }

    public void setUserId(String userId) {
        this.userId = userId;
    }

    public List<Change> getChanges() {
        return changes;
    }

    public void setChanges(List<Change> changes) {
        this.changes = changes;
    }

    public Date getUpdatedAt() {
        return updatedAt;
    }

    public void setUpdatedAt(Date updatedAt) {
        this.updatedAt = updatedAt;
    }
}