GUI CALC

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

public class Frame extends JFrame implements ActionListener
{
   JLayeredPane layeredPane;
   JButton button1;
   JButton button2;
   JButton button3;
   JButton button4;
   JButton button5;
   JButton button6;
   JButton button7;
   JButton button8;
   JButton button9;
   String result = "0";
   JLabel numberGrid;
   JLabel resultLabel;
   JLabel operationsLabel;
   JButton plus;
   JButton minus;
   JButton times;
   JButton division;
   JButton equals;
   JButton log;
   JButton ac;
   JLabel equalsLabel;
   Font font;
   int timesClicked = 0;
   double a;
   double b;
   double answer = 0;
   int operation;

   public Frame()
   {
      JFrame frame = new JFrame();

      frame.setSize(1000, 825);
      frame.setLocationRelativeTo(null);
      frame.setResizable(false);
      frame.setDefaultCloseOperation(EXIT_ON_CLOSE);

      font = new Font("SANS_SERIF", Font.PLAIN, 24);

      layeredPane = frame.getLayeredPane();
      layeredPane.setVisible(true);
      layeredPane.setLayout(null);

      numberGrid = new JLabel();
      numberGrid.setBorder(BorderFactory.createLineBorder((Color.black), 12));
      numberGrid.setBounds(0,200,600,600);
      numberGrid.setLayout(new GridLayout(3,3));
      layeredPane.add(numberGrid, 0);

      resultLabel = new JLabel(result);
      resultLabel.setBorder(BorderFactory.createLineBorder((Color.white), 12));
      resultLabel.setBounds(0,0,1000,200);
      resultLabel.setOpaque(true);
      resultLabel.setFont(font);
      layeredPane.add(resultLabel);

      operationsLabel = new JLabel();
      operationsLabel.setBorder(BorderFactory.createLineBorder((Color.black), 12));
      operationsLabel.setBounds(600,200,400,400);
      operationsLabel.setBackground(Color.gray);
      operationsLabel.setOpaque(true);
      operationsLabel.setLayout(new GridLayout(2, 2));
      layeredPane.add(operationsLabel);

      equalsLabel = new JLabel();
      equalsLabel.setOpaque(true);
      equalsLabel.setBounds(600,600,400,200);
      equalsLabel.setLayout(new BorderLayout());
      equalsLabel.setBorder(BorderFactory.createLineBorder((Color.black), 12));
      layeredPane.add(equalsLabel);

      button1 = new JButton("1");
      button1.addActionListener(this);
      button1.setFont(font);
      numberGrid.add(button1);

      button2 = new JButton("2");
      button2.addActionListener(this);
      button2.setFont(font);
      numberGrid.add(button2);

      button3 = new JButton("3");
      button3.addActionListener(this);
      button3.setFont(font);
      numberGrid.add(button3);

      button4 = new JButton("4");
      button4.addActionListener(this);
      button4.setFont(font);
      numberGrid.add(button4);

      button5 = new JButton("5");
      button5.addActionListener(this);
      button5.setFont(font);
      numberGrid.add(button5);

      button6 = new JButton("6");
      button6.addActionListener(this);
      button6.setFont(font);
      numberGrid.add(button6);

      button7 = new JButton("7");
      button7.addActionListener(this);
      button7.setFont(font);
      numberGrid.add(button7);

      button8 = new JButton("8");
      button8.addActionListener(this);
      button8.setFont(font);
      numberGrid.add(button8);

      button9 = new JButton("9");
      button9.addActionListener(this);
      button9.setFont(font);
      numberGrid.add(button9);

      plus = new JButton("+");
      plus.addActionListener(this);
      plus.setFont(font);
      operationsLabel.add(plus);

      minus = new JButton("-");
      minus.addActionListener(this);
      minus.setFont(font);
      operationsLabel.add(minus);

      times = new JButton("X");
      times.addActionListener(this);
      times.setFont(font);
      operationsLabel.add(times);

      division = new JButton("/");
      division.addActionListener(this);
      division.setFont(font);
      operationsLabel.add(division);

      log = new JButton("log(a|b)");
      log.addActionListener(this);
      log.setFont(font);
      operationsLabel.add(log);

      ac = new JButton("AC");
      ac.addActionListener(this);
      ac.setFont(font);
      operationsLabel.add(ac);

      equals = new JButton("=");
      equals.addActionListener(this);
      equals.setFont(font);
      equalsLabel.add(equals);

      frame.setVisible(true);
   }

   public void actionPerformed(ActionEvent e)
   {
      if(e.getSource() instanceof JButton)
      {
         JButton tempButton = (JButton)e.getSource();

         if(!(tempButton == plus || tempButton == minus || tempButton == division || tempButton == times || tempButton == equals || tempButton == log || tempButton == ac))
         {
            resultLabel.setText(tempButton.getText());

            if(timesClicked == 0)
            {
               a = (double)Integer.parseInt(tempButton.getText());
               timesClicked++;
            }

            else if(timesClicked >= 1)
            {
               b = (double)Integer.parseInt(tempButton.getText());
               timesClicked++;
            }
         }

         if(tempButton == plus || tempButton == minus || tempButton == times || tempButton == division || tempButton == log || tempButton == ac)
         {
            switch(tempButton.getText())
            {
               case "+": operation = 1;
               break;
               case "-": operation = 2;
               break;
               case "X": operation = 3;
               break;
               case "/": operation = 4;
               break;
               case "log(a|b)": operation = 5;
               break;
               default: break;
            }
         }

         if(tempButton == equals)
         {
            switch(operation)
            {
               case 1: answer = a + b;
               break;
               case 2: answer = a - b;
               break;
               case 3: answer = a*b;
               break;
               case 4: answer = a/b;
               break;
               case 5: answer = (Math.log(a))/(Math.log(b));
               break;
            }

            resultLabel.setText("" + answer);

            a = answer;
            b = 0;
         }

         if(tempButton == ac)
         {
            timesClicked = 0;
            answer = 0;
            a = 0;
            resultLabel.setText("Reset");
         }
      }
   }
}