JavaFX find person with SearchById

enter code here
package application;

public class Person {
String Id;
String fullName;
String street;
String city;
String gender;
String zip;

public Person(String Id) {
    this.Id = Id;
}

public Person(String Id,String fullName, String street, String city, String gender, String zip) {
    this(Id);
    this.fullName=fullName;
    this.street = street;
    this.city = city;
    this.gender = gender;
    this.zip = zip;
}
public String getId() {
    return Id;
}

public void setId(String id) {
    Id = id;
}

public String getFullName() {
    return fullName;
}

public void setFullName(String fullName) {
    this.fullName = fullName;
}

public String getStreet() {
    return street;
}

public void setStreet(String street) {
    this.street = street;
}
public String getSUID() {
    return Id;
}

public String getCity() {
    return city;
}

public void setCity(String city) {
    this.city = city;
}

public String getGender() {
    return gender;
}

public void setGender(String gender) {
    this.gender = gender;
}

public String getZip() {
    return zip;
}

public void setZip(String zip) {
    this.zip = zip;
}

@Override
public String toString() {
    return "Id: " + Id +"Full Name: " + fullName + " | Street: " + street +
            " | City: " + city + " | Gender: " + gender + " | Zip: " + zip;
}

}

enter code herepackage application;
import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Alert;
import javafx.scene.control.Button;
import javafx.scene.control.ContentDisplay;
import javafx.scene.control.Label;
import javafx.scene.control.TextField;
import javafx.scene.control.Alert.AlertType;
import javafx.scene.layout.*;
import javafx.stage.Stage;


import java.io.*;
import java.nio.file.DirectoryStream.Filter;
import java.util.ArrayList;

public class Main extends Application {

public static void main(String[] args) {
    Application.launch(args);
}

@Override
public void start(Stage primaryStage) throws Exception {

    AddressBook addrPane = new AddressBook("C:\\Users\\fener\\eclipse- 
workspace\\Projectfx\\src");
    primaryStage.setScene(new Scene(addrPane));
    primaryStage.setTitle("Address Book");
    primaryStage.show();
    
    Alert alert = new Alert(AlertType.INFORMATION);
    alert.setTitle("Information Dialog");
    alert.setHeaderText("Look, an Information Dialog");
}

}

class BasicAddressPane extends GridPane {

// Labels
Label lblId;
Label lblSUID;
Label lblName;
Label lblStreet;
Label lblCity;
Label lblGender;
Label lblZip;


// TextFields
TextField tfId;
TextField tfSUID;
TextField tfName;
TextField tfStreet;
TextField tfCity;
TextField tfGender;
TextField tfZip;

BasicAddressPane() {

    // Grid pane settings
    this.setPadding(new Insets(10));
    this.setHgap(140);
    this.setVgap(10);

    // Create Labels with Textfield
    lblId = createComponent("      ID:", 0, tfId = new TextField(), 0);
    lblSUID = createComponent("Search/UpdateID:", 0, tfSUID = new TextField(), 0);
    lblName = createComponent("Name:", 0, tfName = new TextField(), 0);
    lblStreet = createComponent("Street:", 0, tfStreet = new TextField(), 0);
    lblCity = createComponent("   City:", 140, tfCity = new TextField(), 100);
    lblGender = createComponent("Gender:", 90, tfGender = new TextField(), 40);
    lblZip = createComponent("Zip:", 138, tfZip = new TextField(), 110);

    // add id on first row
    this.add(lblId, 0, 0, 4, 1);
    tfId.setPrefColumnCount(4);
    
    // add id on first row
    this.add(lblSUID, 1, 0, 4, 1);
    tfSUID.setPrefColumnCount(9);
    
    // add name on second row
    this.add(lblName, 0, 1, 4, 1);
    tfName.setPrefColumnCount(27);

    // add street on third row
    this.add(lblStreet, 0, 2, 4, 1);
    tfStreet.setPrefColumnCount(27);

    // add city, state, zip on fourth row
    HBox hBox = new HBox();
    hBox.getChildren().addAll(lblCity, lblGender, lblZip);
    hBox.setMaxWidth(410);
    hBox.setSpacing(1);
    this.add(hBox, 0, 3, 4, 1);

}

/**
 * @param name      - Name of Label
 * @param lblWidth  - Label max width: 0 = default
 * @param textField - TextField to be attached with label
 * @param tfWidth   - TextField max width: 0 = default
 * @return Label
 */
private Label createComponent(String name, double lblWidth, TextField textField, double tfWidth) 
{
    Label label = new Label(name, textField);
    label.setContentDisplay(ContentDisplay.RIGHT);

    // set textfield and label custom min width if needed
    if (lblWidth > 0) {
        label.setMaxWidth(lblWidth);
    }
    if (tfWidth > 0) {
        textField.setMaxWidth(tfWidth);
    }
    return label;
}

protected void setTextFields(String Id,String SUID,String name, String street, String city, 
String gender, String zip) {
    
    tfId.setText(Id);
    tfSUID.setText(SUID);
    tfName.setText(name);
    tfStreet.setText(street);
    tfCity.setText(city);
    tfGender.setText(gender);
    tfZip.setText(zip);
}

}

class AddressBook extends BasicAddressPane {


ArrayList<Person> persons;
int index = 0;

// Buttons
Button btnAdd;
Alert alert = new Alert(AlertType.INFORMATION);
Button btnFirst;
Button btnNext;
Button btnPrev;
Button btnLast;
Button btnSearch;
Button btnUpdate;
Button btnClear;

boolean isNewFile;

String fileName = "AddressBook.dat";


File file;

AddressBook() {
    this(System.getProperty("user.dir")); // default path is current working directory
}

AddressBook(String path) {

    btnAdd = new Button("Add");
    btnFirst = new Button("First");
    btnNext = new Button("Next");
    btnPrev = new Button("Prev");
    btnLast = new Button("Last");
    btnSearch = new Button("SearchById");
    btnUpdate = new Button("UpdateById");
    btnClear = new Button ("CleanTextFields");
    
    // Init buttons and create bottom button panel
    HBox hBox = new HBox(10, btnAdd, btnFirst, btnPrev, btnNext, btnLast, btnSearch, btnUpdate, 
btnClear);
    //hBox.setAlignment(Pos.CENTER);
    this.add(hBox, 0, 4, 5, 1);

    // create listeners
    btnAdd.setOnAction(e -> addPerson());
    btnUpdate.setOnAction(e -> updatePerson());

    btnFirst.setOnAction(e -> {
        index = 0;
        refresh();
    });
    btnLast.setOnAction(e -> {
        index = persons.size() - 1;
        refresh();
    });

    btnNext.setOnAction(e -> next());
    btnPrev.setOnAction(e -> previous());
    btnClear.setOnAction(e -> clear());

    // Get address book file
    file = new File(path + fileName);
    // if file doesn't exist, create it
    try {
        isNewFile = file.createNewFile();
    } catch (IOException e) {
        e.printStackTrace();
    }
    if (!isNewFile) {
        syncPersons();
    } else {
        persons = new ArrayList<>();

    }

    refresh();
}

private void previous() {
    if (index > 0) {
        index--;
        refresh();
        tfId.setDisable(true);
    }
}

private void next() {
    if (index != persons.size() - 1) {
        index++;
        refresh();
        tfId.setDisable(true);
    }
}

private void refresh() {

    if (persons.isEmpty()) return;

    Person c = persons.get(index);
    setTextFields(
            c.getId(),
            c.getSUID(),
            c.getFullName(),
            c.getStreet(),
            c.getCity(),
            c.getGender(),
            c.getZip()
    );

}
private void clear() {
        cleanTextFields();
        tfId.setDisable(false);
}
private void cleanTextFields() {
    
    tfId.clear();
    tfSUID.clear();
    tfName.clear();
    tfStreet.clear();
    tfCity.clear();
    tfGender.clear();
    tfZip.clear();
}


public void searchID(){
     
    
    
    
    
    
     }

public void addPerson() {
    persons.add(getCurrentPerson());
    index = persons.size() - 1;
    refresh();
    savePersons();
    alert.setContentText("Record is added successfully");
    alert.showAndWait();
    cleanTextFields();
    
}

public void updatePerson() {
    persons.remove(index);
    persons.add(index, getCurrentPerson());
    savePersons();
    tfId.setDisable(true);
}

public Person getCurrentPerson() {
    return new Person(
            tfId.getText(),
            tfName.getText(),
            tfStreet.getText(),
            tfCity.getText(),
            tfGender.getText(),
            tfZip.getText()
    );
}

/**
 * Reads address book and saves Persons to ArrayList
 */
private void syncPersons() {

    // Init new buffer array
    persons = new ArrayList<>();

    // Byte array for each field
    byte[] Id = new byte[4];
    byte[] name = new byte[32];
    byte[] street = new byte[32];
    byte[] city = new byte[20];
    byte[] gender = new byte[2];
    byte[] zip = new byte[5];

    try (FileInputStream input = new FileInputStream(file)) {

        while (input.available() >= 95 && -1 != input.read(Id)) {
            input.read(name);
            input.read(street);
            input.read(city);
            input.read(gender);
            input.read(zip);
            persons.add(new Person(
                    new String(Id, "UTF-8"),
                    new String(name, "UTF-8"),
                    new String(street, "UTF-8"),
                    new String(city, "UTF-8"),
                    new String(gender, "UTF-8"),
                    new String(zip, "UTF-8")
            ));

        }

    } catch (IOException e) {
        e.printStackTrace();
    }

}
 //FileOperations test= new FileOperations();


 public byte[] getFixedSizeByteArray(String string, int fixedSize) {

        byte[] src = string.getBytes();
        
        byte[] fixedArray = new byte[fixedSize];
        
        System.arraycopy(src, 0, fixedArray, 0, Math.min(src.length, fixedSize));

        return fixedArray;
    }



private void savePersons() {

    try (FileOutputStream out = new FileOutputStream(file)) {

        for (Person c : persons) {
            
            out.write(getFixedSizeByteArray(c.getId(), 4));
            out.write(getFixedSizeByteArray(c.getFullName(), 32));
            out.write(getFixedSizeByteArray(c.getStreet(), 32));
            out.write(getFixedSizeByteArray(c.getCity(), 20));
            out.write(getFixedSizeByteArray(c.getGender(), 2));
            out.write(getFixedSizeByteArray(c.getZip(), 5));
        }

    } catch (IOException e) {
        e.printStackTrace();
    }

}
}

When I type the Id number in the Search / UpdateId textfield and press the SearchById button, the person with that ID should come. I need a search function that does them. And SearchByID textfields must be empty, but The Search / Update ID textfield shows the id's number, it should only get input from the user.

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