Why doesn't my second button show in Java

Question

I am having a problem with my code. For some reason, it won't show my second button b2, and I can't set the size for the first button. I want to have both buttons next to each other in the middle with some space around them.

import java.awt.*;
import java.awt.event.*;

import javax.swing.JFrame;

public class HW10{
    Button b1, b2;
    L1 l1;
    class L1 implements ActionListener{

        @Override
        public void actionPerformed(ActionEvent e) {
            int tmp = Integer.parseInt(b1.getLabel());
            tmp++;
            b1.setLabel(""+tmp);
        }
        
    }
    public HW10(){
        JFrame frame = new JFrame("Homework 15");
        l1 = new L1();
        b1 = new Button("0");
        b2 = new Button("KURAC");
        b1.addActionListener(l1);
        b1.setBounds(100, 100, 100, 80);
        frame.add(b1);
        frame.setBounds(200,200,400,400);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);
    }
    public static void main(String[] args) {
        HW10 kk = new HW10();
    }

}

Answer 1

The other answers are correct that you don't add the second button at all, however, you shouldn't add components to frames directly. What you want to do is

frame.getContentPane().add(button1);
frame.getContentPane().add(button2);

You should also probably be setting a layout manager to the pane.