package shx;
import java.awt.BorderLayout;
import java.awt.GridLayout;
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.JTextField;
public class Jsq implements ActionListener {
private JFrame frame;
private JButton[] bus;
private JTextField jtx;
private JButton bu;
private char[] strs;
private String d_one = "";
private String operator;
public static void main(String[] args) {
new Jsq();
}
public Jsq() {
frame = new JFrame("计算器");
jtx = new JTextField(14);
bus = new JButton[16];
strs = "789/456*123-0.+=".toCharArray();
for (int i = 0; i < 16; i++) {
bus[i] = new JButton(strs[i] + "");
bus[i].addActionListener(this);
}
bu = new JButton("C");
bu.addActionListener(this);
init(); }
public void init() {
JPanel jp1 = new JPanel();
jp1.add(jtx); jp1.add(bu);
frame.add(jp1, BorderLayout.NORTH);
JPanel jp2 = new JPanel();
jp2.setLayout(new GridLayout(4, 4));
for (int i = 0; i < 16; i++) {
jp2.add(bus[i]);
}
frame.add(jp2, BorderLayout.CENTER);
frame.pack();
frame.setLocation(300, 400);
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
public void actionPerformed(ActionEvent arg0) {
String conn = arg0.getActionCommand();
if ("C".equals(conn)) {
d_one = "";
operator = "";
jtx.setText("");
return;
}
if(".".equals(conn)){
return;
}
if (("+-*/".indexOf(conn)) != -1) {
if("".equals(d_one) && "".equals(jtx.getText()))
return;
d_one = jtx.getText(); operator = conn;
jtx.setText("");
return;
}
if ("=".equals(conn)) {
if("".equals(d_one) && "".equals(jtx.getText()))
return;
double db = 0;
if ("+".equals(operator)) {
db = Double.parseDouble(d_one) + Double.parseDouble(jtx.getText());
jtx.setText(db + "");
}
if ("-".equals(operator)) {
db = Double.parseDouble(d_one) - Double.parseDouble(jtx.getText());
jtx.setText(db + "");
}
if ("*".equals(operator)) {
db = Double.parseDouble(d_one) * Double.parseDouble(jtx.getText());
jtx.setText(db + "");
}
if ("/".equals(operator)) {
db = Double.parseDouble(d_one) / Double.parseDouble(jtx.getText());
jtx.setText(db + "");
}
d_one = db + "";
return;
}
jtx.setText(jtx.getText() + conn);
}
}
