Simple calculator using Swing

[Rohit Gaikwad]

please check the code and let me know whats wrong with it as its not calculating as required
Thanks in advance

here is the code

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;
public class Gui implements  ActionListener  {
	//JFrame f1 = new JFrame ("Calculator");
	String text ="" ;
	long result =0;
	long a, b;
	int function  ;
	JTextArea tx  = new JTextArea();
	
	JButton b9 = new JButton ("9");
	JButton b7 = new JButton ("7");
	JButton b8 = new JButton ("8");
	JButton bd = new JButton ("/");
	JButton b4 = new JButton ("4");
	JButton b5 = new JButton ("5");
	JButton b6 = new JButton ("6");
	JButton bm = new JButton ("*");
	JButton b3 = new JButton ("3");
	JButton b2 = new JButton ("2");
	JButton b1 = new JButton ("1");
	JButton bs = new JButton ("-");
	JButton b0 = new JButton ("0");
	JButton bp = new JButton ("+");
	JButton be = new JButton ("=");
	
	
	public Gui() {
		
		b7.addActionListener(this);
		b8.addActionListener(this);
		b9.addActionListener(this);
		bd.addActionListener(this);
		b4.addActionListener(this);
		b5.addActionListener(this);
		b6.addActionListener(this);
		bm.addActionListener(this);
		b3.addActionListener(this);
		b2.addActionListener(this);
		b1.addActionListener(this);
		bs.addActionListener(this);
		b0.addActionListener(this);
		bp.addActionListener(this);
		be.addActionListener(this);
		tx.setColumns(3);
		JFrame f1 = new JFrame ("Calculator");
		// TODO Auto-generated constructor stub
		f1.setLayout(new BorderLayout());
		JPanel p1 = new JPanel ();
		p1.setLayout(new GridLayout(4,4));
		p1.add(b7);
		p1.add(b8);
		p1.add(b9);
		p1.add(bd);
		p1.add(b4);
		p1.add(b5);
		p1.add(b6);
		p1.add(bm);
		p1.add(b1);
		p1.add(b2);
		p1.add(b3);
		p1.add(bs);
		p1.add(b0);
		p1.add(bp);
		p1.add(be);
		
		f1.add(tx, BorderLayout.NORTH);
		f1.add(p1,BorderLayout.SOUTH);
		//JPanel p = new JPanel ();
		//p.setLayout(new GridLayout() );
		//p.add(f1);
		f1.setSize(250, 300);
		f1.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		f1.setVisible(true);
		
	
		
	}

	
	
	

	public static void main(String[] args) {
		// TODO Auto-generated method stub
        new Gui();
	}



	@Override
	public void actionPerformed(ActionEvent e) {
		
		
		
		if (e.getSource()==be){
			a =  Long.parseLong(tx.getText());
			text = "0";
			tx.setText(text);
			function  = 1;
			}
	 if (e.getSource()==bs){
			a =  Long.parseLong(tx.getText());
			text = "0";
			tx.setText(text);
			function  = 2;
			}
	 if (e.getSource()==bm){
			a = Long.parseLong(tx.getText());
			text = "0";
			tx.setText(text);
			function  = 3;
			}
		if (e.getSource()==bd){
			a =  Long.parseLong(tx.getText());
			text = "0";
			tx.setText(text);
			function  = 4;
			}
		if (e.getSource()==b1)
		{
			text =tx.getText();
			tx.setText(text+1);
			
		}
		if (e.getSource()==b2)
		{
			text =tx.getText();
			tx.setText(text+2);
			
		}
		if (e.getSource()==b3)
		{
			text =tx.getText();
			tx.setText(text+3);
			
		}
		if (e.getSource()==b4)
		{
			text =tx.getText();
			tx.setText(text+4);
			
		}
		if (e.getSource()==b5)
		{
			text =tx.getText();
			tx.setText(text+5);
			
		}
		if (e.getSource()==b6)
		{
			text =tx.getText();
			tx.setText(text+6);
			
		}
		if (e.getSource()==b7)
		{
			text =tx.getText();
			tx.setText(text+7);
			
		}
		if (e.getSource()==b8)
		{
			text =tx.getText();
			tx.setText(text+8);
			
		}
		if (e.getSource()==b9)
		{
			text =tx.getText();
			tx.setText(text+9);
			
		}
		if (e.getSource()==b0)
		{
			text =tx.getText();
			tx.setText(text+0);
			
		}
	if (e.getSource()==be){
		b = Long.parseLong( tx.getText());
		switch (function) {
		case 1 :
			result =  a + b;
		tx.setText("" +result);
		function =0;
		result = 0;
		break ;
		
		case 2 :
			result =  a - b;
		tx.setText("" +result);
		function =0;
		result =0;
		break ;
		
		case 3 :
			result =  a * b;
		tx.setText("" +result);
		function =0;
		result =0;
		break ;
		case 4: 
			result =  a / b;
		tx.setText("" +result); 
		function =0;
		result =0;
		break ;
		
		default: tx.setText("0");
		
		
	}
	}
		}




}

[Rohit Gaikwad]

Sorry to bother you guys got it done was a simple typo mistake