Remove Error

Question

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

import javax.swing.JButton;
import javax.swing.JPanel;
import javax.swing.JTextField;
class Gridlayout extends JFrame implements ActionListener {

JButton b[]=new JButton[20];
JPanel p1,p2;
JTextField t1;
Gridlayout()
{
setTitle("calculator");
t1=new JTextField(100);
Font f=new Font("arial",Font.BOLD,30);
t1.setFont(f);
t1.setText("0");
p1=new JPanel();
p1.setLayout(new FlowLayout(FlowLayout.LEFT,2,2));
p1.add(t1);
p2=new JPanel();
p2.setLayout(new GridLayout(5,4,4,4));
for(int i=0;i<b.length;i++){

b[i]=new JButton(""+(i+1));
p2.add(b[i]);
b[i].addActionListener(this);
}

b[9].setText("+");
b[10].setText("=");
add(p1,BorderLayout.NORTH);
add(p2,BorderLayout.CENTER);
setSize(400,400);
setVisible(true);

}
public static void main(String...

Answer 1

What is your error? Have you try to start your app in debug mode with end-points ?

Answer 2

interface ActionListener requires to implement
actionPerformed() method

@Override
public void actionPerformed( ActionEvent e) { }

public static void main(String[] args) {
new Gridlayout();
}
}

but layout seems to be unwished