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import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.GridLayout;
import java.awt.Point;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.text.DecimalFormat;
import javax.swing.*;
public class Calculator extends JFrame implements ActionListener, ItemListener {

private JButton buttons[];
private JButton btClear, btTransfer;
private JTextField resultArea;
private JPanel resultPanel, buttonsPanel, transferPanel;
int cmbIndex = 1;
private String string[] = { "7", "8", "9", "/", "6", "5", "4", "*", "3",
"2", "1", "-", "0", ".", "=", "+" };
private String s = "", shu1 = "", shu2 = "", shu3 = "";
private static int fo = 0;
JComboBox cmbox;
private boolean ff = true;
public Calculator() {
super("½øÖƼÆËãÆ÷");
Container container = getContentPane();
container.setLayout(new FlowLayout());

resultPanel = new JPanel();
resultArea = new JTextField(13);
resultPanel.add(resultArea);
btClear = new JButton("C");
resultPanel.add(btClear);

transferPanel = new JPanel();
cmbox = new JComboBox();
cmbox.addItem("10½øÖÆת»»Îª2½øÖÆ");
cmbox.addItem("10½øÖÆת»»Îª8½øÖÆ");
cmbox.addItem("10½øÖÆת»»Îª16½øÖÆ");
cmbox.addItem("2½øÖÆת»»Îª8½øÖÆ");
cmbox.addItem("2½øÖÆת»»Îª10½øÖÆ");
cmbox.addItem("2½øÖÆת»»Îª16½øÖÆ");
cmbox.addItem("8½øÖÆת»»Îª2½øÖÆ");
cmbox.addItem("8½øÖÆת»»Îª10½øÖÆ");
cmbox.addItem("8½øÖÆת»»Îª16½øÖÆ");
cmbox.addItem("16½øÖÆת»»Îª2½øÖÆ");
cmbox.addItem("16½øÖÆת»»Îª8½øÖÆ");
cmbox.addItem("16½øÖÆת»»Îª10½øÖÆ");
transferPanel.add(cmbox);
btTransfer = new JButton("ת");
transferPanel.add(btTransfer);

buttonsPanel = new JPanel();
buttonsPanel.setLayout(new GridLayout(4, 4, 10, 10));
butto