Exception in thread "main" java.lang.Error: Unresolved compilation problem: at QuizGame.main(QuizGame.java:83) - visual-studio-code

Question

How can I solve this error occurred in VS-Code after I used implements in my code what's the error help me out
I just trying to make a project on QuizGame with the help of this YouTube channel:https://youtu.be/EMTkeefioMg
I tried everything but still getting the error many times please help me out with this code
import javax.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.*;
import javax.swing.JFrame;
import javax.swing.plaf.FontUIResource;
public class QuizGame extends JFrame implements ActionListener {
JButton b1, b2;
QuizGame () //Constructor
{
setBounds(200, 100, 1000, 500);
getContentPane().setBackground(Color.WHITE);
setLayout(null);
/* ImageIcon i1 = new ImageIcon(ClassLoader.getSystemResource("2021 project/Java project/GUI Programs/quizlogo.jpg"));
JLabel l1 = new JLabel(i1);
l1.setBounds(0, 0, 500, 500);
add(l1);*/
JLabel l2 = new JLabel("Quiz Game");
l2.setFont(new FontUIResource("Mongolian Baiti",Font.BOLD,
55));
l2.setForeground(Color.BLUE);
l2.setBounds(620, 40, 300, 45);
add(l2);
JLabel l3 = new JLabel("Enter Your Name:");
l3.setFont(new FontUIResource("Mongolian Baiti", Font.BOLD, 25));
l3.setForeground(Color.BLUE);
l3.setBounds(650, 180, 250, 45);
add(l3);
JTextField t1 = new JTextField();
t1.setBounds(625, 240, 250, 35);
t1.setFont(new FontUIResource("Times New Roman", Font.BOLD, 20));
add(t1);
b1 = new JButton("Rules");
b1.setBounds(600, 320, 120, 25);
b1.setBackground(new Color(30, 144, 254));
b1.setForeground(Color.WHITE);
b1.addActionListener(this);
add(b1);
b2 = new JButton("Exit");
b2.setBounds(800, 320, 120, 25);
b2.setBackground(new Color(255, 0, 0));
b2.setForeground(Color.WHITE);
b2.addActionListner(this);
add(b2);
setVisible(true);
}
public class Rules extends JFrame{
Rules(){
setBounds(200, 100, 1000, 500);
getContentPane().setBackground(Color.WHITE);
setLayout(null);
JLabel l1 = new JLabel("Welcome"+ username + "to Quiz Game");
l1.setBounds(50, 20, 700, 30);
add(l1);
setVisible(true);
}
}
public void actionPerformed(ActionEvent ae){
if(ae.getSource() == b1){
}
else{
System.exit(0);
}
}
public static void main(String[] args){ //(Line 83)
new QuizGame(); //object created
}
}

Answer 1

After Java: Clean Java Language Server Workspace from Command Palette, here's a simple correction that makes your code show the first window at least:
import java.awt.Color;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextField;
import javax.swing.plaf.FontUIResource;
public class QuizGame extends JFrame implements ActionListener {
JButton b1, b2;
JTextField t1;
QuizGame () //Constructor
{
setBounds(200, 100, 1000, 500);
getContentPane().setBackground(Color.WHITE);
setLayout(null);
/* ImageIcon i1 = new ImageIcon(ClassLoader.getSystemResource("2021 project/Java project/GUI Programs/quizlogo.jpg"));
JLabel l1 = new JLabel(i1);
l1.setBounds(0, 0, 500, 500);
add(l1);*/
JLabel l2 = new JLabel("Quiz Game");
l2.setFont(new FontUIResource("Mongolian Baiti",Font.BOLD,
55));
l2.setForeground(Color.BLUE);
l2.setBounds(620, 40, 300, 45);
add(l2);
JLabel l3 = new JLabel("Enter Your Name:");
l3.setFont(new FontUIResource("Mongolian Baiti", Font.BOLD, 25));
l3.setForeground(Color.BLUE);
l3.setBounds(650, 180, 250, 45);
add(l3);
t1 = new JTextField();
t1.setBounds(625, 240, 250, 35);
t1.setFont(new FontUIResource("Times New Roman", Font.BOLD, 20));
add(t1);
b1 = new JButton("Rules");
b1.setBounds(600, 320, 120, 25);
b1.setBackground(new Color(30, 144, 254));
b1.setForeground(Color.WHITE);
b1.addActionListener(this);
add(b1);
b2 = new JButton("Exit");
b2.setBounds(800, 320, 120, 25);
b2.setBackground(new Color(255, 0, 0));
b2.setForeground(Color.WHITE);
b2.addActionListener(this);
add(b2);
setVisible(true);
}
public class Rules extends JFrame{
Rules(){
setBounds(200, 100, 1000, 500);
getContentPane().setBackground(Color.WHITE);
setLayout(null);
String username=t1.getText();
JLabel l1 = new JLabel("Welcome" +username+"to Quiz Game");
l1.setBounds(50, 20, 700, 30);
add(l1);
setVisible(true);
}
}
public void actionPerformed(ActionEvent ae){
if(ae.getSource() == b1){
}
else{
System.exit(0);
}
}
public static void main(String[] args){ //(Line 83)
new QuizGame(); //object created
}
}
The tutorial you referred is very explicit, and the author created the standalone rules.java to make code more succinct. Please follow the tutorial carefully and try again.