Java gui

import java.awt.BorderLayout;
import java.awt.EventQueue;

import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
import javax.script.ScriptException;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.JTextField;
import javax.swing.JButton;

import java.awt.Color;
import java.awt.SystemColor;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;


public class Calculator extends JFrame {

    private JPanel contentPane;
    private JTextField console;

    /**
     * Launch the application.
     */
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    Calculator frame = new Calculator();
                    frame.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    /**
     * Create the frame.
     */
    public Calculator() {
        setResizable(false);
        setTitle("calculator");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setBounds(100, 100, 369, 475);
        contentPane = new JPanel();
        contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
        setContentPane(contentPane);
        contentPane.setLayout(null);

        console = new JTextField();
        console.setEditable(false);
        console.setBounds(21, 21, 315, 61);
        contentPane.add(console);
        console.setColumns(10);

        JButton button = new JButton("1");
        button.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent arg0) {
                String gettext=console.getText();
                console.setText( gettext+"1");
            }
        });
        button.setBackground(new Color(240, 240, 240));
        button.setBounds(21, 120, 56, 40);
        contentPane.add(button);

        JButton button_1 = new JButton("2");
        button_1.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent arg0) {
                String gettext=console.getText();
                console.setText( gettext+"2");
            }
        });
        button_1.setBounds(104, 122, 56, 40);
        contentPane.add(button_1);

        JButton button_2 = new JButton("3");
        button_2.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent arg0) {
                String gettext=console.getText();
                console.setText( gettext+"3");
            }
        });
        button_2.setBounds(170, 122, 56, 38);
        contentPane.add(button_2);

        JButton btnNewButton = new JButton("4");
        btnNewButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent arg0) {
                String gettext=console.getText();
                console.setText( gettext+"4");
            }
        });
        btnNewButton.setBounds(236, 122, 64, 40);
        contentPane.add(btnNewButton);

        JButton button_3 = new JButton("5");
        button_3.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent arg0) {
                String gettext=console.getText();
                console.setText( gettext+"5");
            }
        });
        button_3.setBackground(SystemColor.menu);
        button_3.setBounds(21, 191, 56, 40);
        contentPane.add(button_3);

        JButton button_5 = new JButton("6");
        button_5.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent arg0) {
                String gettext=console.getText();
                console.setText( gettext+"6");
            }
        });
        button_5.setBounds(104, 192, 56, 38);
        contentPane.add(button_5);

        JButton button_6 = new JButton("7");
        button_6.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent arg0) {
                String gettext=console.getText();
                console.setText( gettext+"7");
            }
        });
        button_6.setBounds(180, 191, 64, 40);
        contentPane.add(button_6);

        JButton button_7 = new JButton("8");
        button_7.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent arg0) {
                String gettext=console.getText();
                console.setText( gettext+"8");
            }
        });
        button_7.setBackground(SystemColor.menu);
        button_7.setBounds(254, 191, 56, 40);
        contentPane.add(button_7);

        JButton button_8 = new JButton("9");
        button_8.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent arg0) {
                String gettext=console.getText();
                console.setText( gettext+"9");
            }
        });
        button_8.setBounds(21, 262, 56, 40);
        contentPane.add(button_8);

        JButton button_9 = new JButton("0");
        button_9.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent arg0) {
                String gettext=console.getText();
                console.setText( gettext+"0");
            }
        });
        button_9.setBounds(104, 263, 56, 38);
        contentPane.add(button_9);

        JButton button_10 = new JButton("+");
        button_10.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent arg0) {
                String gettext=console.getText();
                console.setText( gettext+"+");
            }
        });
        button_10.setBackground(SystemColor.menu);
        button_10.setBounds(21, 335, 56, 40);
        contentPane.add(button_10);

        JButton button_11 = new JButton("-");
        button_11.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent arg0) {
                String gettext=console.getText();
                console.setText( gettext+"-");
            }
        });
        button_11.setBounds(104, 337, 56, 40);
        contentPane.add(button_11);

        JButton button_12 = new JButton("*");
        button_12.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent arg0) {
                String gettext=console.getText();
                console.setText( gettext+"*");
            }
        });
        button_12.setBounds(170, 337, 56, 38);
        contentPane.add(button_12);

        JButton button_13 = new JButton("/");
        button_13.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent arg0) {
                String gettext=console.getText();
                console.setText( gettext+"/");
            }
        });
        button_13.setBounds(236, 337, 64, 40);
        contentPane.add(button_13);

        JButton button_14 = new JButton("=");
        button_14.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent arg0) {
                ScriptEngineManager c=new ScriptEngineManager();
                ScriptEngine r=c.getEngineByName("JavaScript");
                String result=console.getText();
                try {
                    console.setText(r.eval(result).toString());
                } catch (ScriptException e) {
                    // TODO Auto-generated catch block
                    console.setText("Eror");
                }
            }
        });
        button_14.setBackground(SystemColor.menu);
        button_14.setBounds(21, 386, 56, 40);
        contentPane.add(button_14);

        JButton btnAc = new JButton("Ac");
        btnAc.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent arg0) {
                console.setText(null);
            }
        });
        btnAc.setBounds(104, 388, 56, 40);
        contentPane.add(btnAc);
    }
}