How do I make the submit, modify, and delete buttons work? I did the layout but need help in making action events. 

I also need help in making this GUI app using random access file. How do I do that?

 

Here's the classes I've created:

 

--Main Class

import javax.swing.JFrame;

public class Main {

public static void main(String[] args) {
 // TODO Auto-generated method stub
 
 ProductManager pro = new ProductManager();
 pro.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 pro.setSize(400, 400);
 pro.setVisible(true);

}

}

 

--------------

-- Product Class

public class Product {

//declared instance variables for product class

private static int count = 0;
int productId;
String productName;
double productPrice;

private boolean isFilled;

//declared constructors
public Product(int productId, String productName, double productPrice) {
 this.productId = productId;
 this.productName = productName;
 this.productPrice = productPrice;
//  setProductId(++count);
}

public Product() {
 this.productId = 0;

}

//getter for product ID
public int getProductId() {
 return productId;
}

//getter for product name
public String getProductName() {
 return productName;
}

//getter for product price
public double getProductPrice() {
 return productPrice;
}

}

 

--------------------

 

--ProductManager Class

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileReader;
import java.io.Writer;

import javax.swing.AbstractButton;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;

public class ProductManager extends JFrame {

//declare variables as JLabel
private JLabel productIdLabel;
private JLabel productNameLabel;
private JLabel productPriceLabel;

//declare variables as JTextfield
JTextField productIdField;
JTextField productNameField;
JTextField productPriceField;

//label for frame title
private JLabel frameTitle;

//JButtons for submit and search
private JButton submit;
private JButton modify;
private JButton delete;

//text area
// private JTextArea productManagerArea;
protected JTextArea area;

//constructor to initialize the components
public ProductManager() {
 setTitle("Product Manager");
 setLayout(null);
 
 //initialize ID label
 productIdLabel = new JLabel("Product ID: ");
 productIdLabel.setBounds(20, 50, 100, 30);
 this.add(productIdLabel);
 
 //initialize Name label
 productNameLabel = new JLabel("Product Name: ");
 productNameLabel.setBounds(20, 100, 100,30);
 this.add(productNameLabel);
 
 //initialize Price label
 productPriceLabel = new JLabel("Product Price: ");
 productPriceLabel.setBounds(20, 150, 100, 30);
 this.add(productPriceLabel);
 
 //initialize ID field
 productIdField = new JTextField("");
 productIdField.setBounds(150, 50, 150,30);
 this.add(productIdField);
 
 //initialize Name field
 productNameField = new JTextField("");
 productNameField.setBounds(150, 100, 150,30);
 this.add(productNameField);
 
 //initialize Price field
 productPriceField = new JTextField("");
 productPriceField.setBounds(150, 150, 150,30);
 this.add(productPriceField);
 
 //initialize buttons for submit, modify, deleter
 submit = new JButton("Submit");
 submit.setBounds(20, 250, 100, 30);
 this.add(submit);
 
 modify = new JButton("Modify");
 modify.setBounds(145, 250, 100, 30);
 this.add(modify);
 
 delete = new JButton("Delete");
 delete.setBounds(270, 250, 100, 30);
 this.add(delete);