title: Java Swing calculator
body: <p>I'm a Java Noob and working on the GUI Calculator and I just ended up here..
  I've got the buttons and I need to bind those numbers and store somewhere between the operators ( + - * / ) to show on my JTextArea .. How do I get the values from the buttons and apply the formula? </p>
  
  <p>thanks you for your time... :)</p>
  
  <pre><code>import java.awt.event.ActionEvent;
  import java.awt.event.ActionListener;
  
  import javax.swing.JButton;
  import javax.swing.JFrame;
  import javax.swing.JPanel;
  import javax.swing.JTextArea;
  
  public class Compute implements ActionListener{
  
      public String firstNumber;
      public String secondNumber;
      public String resultNumber;
      public double result = 0.0;
  
      JFrame frame;
      JPanel panel;
      JButton btn_0,btn_1,btn_2,btn_3,btn_4,btn_5,btn_6,btn_7,btn_8,btn_9,btn_C,btn_Add,btn_Sub,btn_Mul,btn_Div,btn_E;
      JTextArea area;
  
      public Compute() {
          area = new JTextArea();
          frame = new JFrame();
          panel = new JPanel();
          btn_0 = new JButton("0");
          btn_0.addActionListener(this);
          btn_1 = new JButton("1");
          btn_1.addActionListener(this);
          btn_2 = new JButton("2");
          btn_2.addActionListener(this);
          btn_3 = new JButton("3");
          btn_3.addActionListener(this);
          btn_4 = new JButton("4");
          btn_4.addActionListener(this);
          btn_5 = new JButton("5");
          btn_5.addActionListener(this);
          btn_6 = new JButton("6");
          btn_6.addActionListener(this);
          btn_7 = new JButton("7");
          btn_7.addActionListener(this);
          btn_8 = new JButton("8");
          btn_8.addActionListener(this);
          btn_9 = new JButton("9");
          btn_9.addActionListener(this);
          btn_C = new JButton("C");
          btn_C.addActionListener(this);
          btn_Add = new JButton("+");
          btn_Add.addActionListener(this);
          btn_Sub = new JButton("-");
          btn_Sub.addActionListener(this);
          btn_Mul = new JButton("x");
          btn_Mul.addActionListener(this);
          btn_Div = new JButton("/");
          btn_Div.addActionListener(this);
          btn_E = new JButton("=");
          btn_E.addActionListener(this);
          frame.setLayout(null);
          frame.setSize(300,400);
          frame.setTitle("GUI_Calculator");
          frame.setLocationRelativeTo(null);
          frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  
          frame.add(btn_C).setBounds(90, 50, 40, 40);
          frame.add(btn_E).setBounds(130, 50, 40, 40);
          frame.add(btn_0).setBounds(50, 50, 40, 40);
          frame.add(btn_1).setBounds(50, 90, 40, 40);
          frame.add(btn_2).setBounds(90, 90, 40, 40);
          frame.add(btn_3).setBounds(130, 90, 40, 40);
          frame.add(btn_4).setBounds(50, 130, 40, 40);
          frame.add(btn_5).setBounds(90, 130, 40, 40);
          frame.add(btn_6).setBounds(130,130, 40, 40);
          frame.add(btn_7).setBounds(50, 170, 40, 40);
          frame.add(btn_8).setBounds(90, 170, 40, 40);
          frame.add(btn_9).setBounds(130, 170, 40, 40);
          frame.add(btn_Add).setBounds(170, 170, 40, 40);
          frame.add(btn_Sub).setBounds(170, 130, 40, 40);
          frame.add(btn_Mul).setBounds(170, 90, 40, 40);
          frame.add(btn_Div).setBounds(170, 50, 40, 40);
  
          frame.add(area).setBounds(50, 20, 160, 25);
  
  
          frame.setVisible(true);
      }
  
      public static void main(String[] args) {
  
          new Compute();
      }
  
  
      @Override
      public void actionPerformed(ActionEvent e) {
  
  
          if(e.getSource() == btn_0)
          {
              area.append("0");
          }
          if(e.getSource() == btn_C)
          {
              area.setText(null);
          }
          if(e.getSource() == btn_1)
          {
              area.append("1");
          }
          if(e.getSource() == btn_2)
          {
              area.append("2");
          }
          if(e.getSource() == btn_3)
          {
              area.append("3");
          }
          if(e.getSource() == btn_4)
          {
              area.append("4");
          }
          if(e.getSource() == btn_5)
          {
              area.append("5");
          }
          if(e.getSource() == btn_6)
          {
              area.append("6");
          }
          if(e.getSource() == btn_7)
          {
              area.append("7");
          }
          if(e.getSource() == btn_8)
          {
              area.append("8");
          }
          if(e.getSource() == btn_9)
          {
              area.append("9");
          }
          if(e.getSource() == btn_E)
          {
          }
  
  
      }
  
  
  
  
  
  
  }
  </code></pre>