一个简单计算器java程序，不知道为什么除法总是算错（不是全概率是高概率应该说，麻烦大大帮忙看看，非常感激
package com.calculator;
import java.awt.BorderLayout;
import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.border.TitledBorder;
import javax.swing.JTextField;
import java.awt.FlowLayout;
import javax.swing.BoxLayout;
import java.awt.GridLayout;
import com.jgoodies.forms.layout.FormLayout;
import com.jgoodies.forms.layout.ColumnSpec;
import com.jgoodies.forms.factories.FormFactory;
import com.jgoodies.forms.layout.RowSpec;
import javax.swing.GroupLayout;
import javax.swing.GroupLayout.Alignment;
import javax.swing.JButton;
import java.awt.Dimension;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.Component;
import java.awt.Point;
public class Calculator_ extends JFrame {
private JPanel contentPane;
private JTextField tf;
private JButton b7;
private JButton b8;
private JButton b9;
private JButton b4;
private JButton b5;
private JButton b6;
private JPanel panel_1;
private JButton b1;
private JButton b2;
private JButton b3;
private JButton b0;
private JButton bpoint;
private JButton badd;
private JButton bcut;
private JButton bmul;
private JButton bdiv;
private JButton bresult;
private JButton bempty;
StringBuilder sb=new StringBuilder("");
StringBuilder sb2=new StringBuilder("");
char c;
double d;
/**
* 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_() {
setTitle("calculator");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 384, 279);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(contentPane);
contentPane.setLayout(null);
JPanel panel = new JPanel();
panel.setBounds(0, 0, 432, 55);
contentPane.add(panel);
panel.setLayout(new BorderLayout(0, 0));
tf = new JTextField();
tf.setEditable(false);
panel.add(tf);
tf.setColumns(10);
panel_1 = new JPanel();
panel_1.setBounds(436, 53, -434, 260);
contentPane.add(panel_1);
b7 = new JButton("7");
b7.addMouseListener(new MouseAdapter() {
public void mouseClicked(MouseEvent e) {
sb.append("7");
tf.setText(sb.toString());
}
});
b7.setBounds(0, 53, 80, 46);
contentPane.add(b7);
b8 = new JButton("8");
b8.addMouseListener(new MouseAdapter() {
public void mouseClicked(MouseEvent e) {
sb.append("8");
tf.setText(sb.toString());
}
});
b8.setBounds(78, 53, 80, 46);
contentPane.add(b8);
b9 = new JButton("9");
b9.addMouseListener(new MouseAdapter() {
public void mouseClicked(MouseEvent arg0) {
sb.append("9");
tf.setText(sb.toString());
}
});
b9.setBounds(158, 53, 80, 46);
contentPane.add(b9);
b4 = new JButton("4");
b4.addMouseListener(new MouseAdapter() {
public void mouseClicked(MouseEvent e) {
sb.append("4");
tf.setText(sb.toString());
}
});
b4.setBounds(0, 97, 80, 46);
contentPane.add(b4);
b5 = new JButton("5");
b5.addMouseListener(new MouseAdapter() {
public void mouseClicked(MouseEvent e) {
sb.append("5");
tf.setText(sb.toString());
}
});
b5.setBounds(78, 97, 80, 46);
contentPane.add(b5);
b6 = new JButton("6");
b6.addMouseListener(new MouseAdapter() {
public void mouseClicked(MouseEvent arg0) {
sb.append("6");
tf.setText(sb.toString());
}
});
b6.setBounds(158, 97, 80, 46);
contentPane.add(b6);
b1 = new JButton("1");
b1.addMouseListener(new MouseAdapter() {
public void mouseClicked(MouseEvent e) {
sb.append("1");
tf.setText(sb.toString());
}
});
b1.setBounds(0, 144, 80, 46);
contentPane.add(b1);
b2 = new JButton("2");
b2.addMouseListener(new MouseAdapter() {
public void mouseClicked(MouseEvent e) {
sb.append("2");
tf.setText(sb.toString());
}
});
b2.setBounds(78, 144, 80, 46);
contentPane.add(b2);
b3 = new JButton("3");
b3.addMouseListener(new MouseAdapter() {
public void mouseClicked(MouseEvent e) {
sb.append("3");
tf.setText(sb.toString());
}
});
b3.setBounds(158, 144, 80, 46);
contentPane.add(b3);
b0 = new JButton("0");
b0.addMouseListener(new MouseAdapter() {
public void mouseClicked(MouseEvent e) {
sb.append("0");
tf.setText(sb.toString());
}
});
b0.setBounds(0, 189, 158, 46);
contentPane.add(b0);
bpoint = new JButton(".");
bpoint.addMouseListener(new MouseAdapter() {
public void mouseClicked(MouseEvent e) {
sb.append(".");
tf.setText(sb.toString());
}
});
bpoint.setBounds(158, 189, 80, 46);
contentPane.add(bpoint);
badd = new JButton("+");
badd.addMouseListener(new MouseAdapter() {
public void mouseClicked(MouseEvent e) {
sb2=sb;
sb=new StringBuilder("");
c='+';
tf.setText("");
}
});
badd.setBounds(236, 97, 66, 46);
contentPane.add(badd);
bcut = new JButton("-");
bcut.addMouseListener(new MouseAdapter() {
public void mouseClicked(MouseEvent e) {
sb2=sb;
sb=new StringBuilder("");
c='-';
tf.setText("");
}
});
bcut.setBounds(236, 144, 66, 46);
contentPane.add(bcut);
bmul = new JButton("*");
bmul.addMouseListener(new MouseAdapter() {
public void mouseClicked(MouseEvent e) {
sb2=sb;
sb=new StringBuilder("");
c='*';
tf.setText("");
}
});
bmul.setBounds(301, 97, 66, 46);
contentPane.add(bmul);
bdiv = new JButton("/");
bdiv.addMouseListener(new MouseAdapter() {
public void mouseClicked(MouseEvent e) {
sb2=sb;
sb=new StringBuilder("");
c='/';
tf.setText("");
}
});
bdiv.setBounds(301, 144, 66, 46);
contentPane.add(bdiv);
bempty = new JButton("empty");
bempty.addMouseListener(new MouseAdapter() {
public void mouseClicked(MouseEvent e) {
sb=new StringBuilder("");
sb2=new StringBuilder("");
tf.setText("");
}
});
bempty.setBounds(236, 53, 131, 46);
contentPane.add(bempty);
bresult = new JButton("=");
bresult.addMouseListener(new MouseAdapter() {
public void mouseClicked(MouseEvent arg0) {
try {
switch (c) {
case '+':
d = Double.parseDouble(sb.toString())
+ Double.parseDouble(sb2.toString());
break;
case '-':
d = Double.parseDouble(sb.toString())
- Double.parseDouble(sb2.toString());
break;
case '*':
d = Double.parseDouble(sb.toString())
* Double.parseDouble(sb2.toString());
break;
case '/':
d = Double.parseDouble(sb.toString().trim())
/ Double.parseDouble(sb2.toString().trim());
break;
}
tf.setText("" + d);
} catch (NumberFormatException e) {
tf.setText("输入数据格式出错，请清空重新输入");
}
}
});
bresult.setBounds(236, 189, 131, 45);
contentPane.add(bresult);
}
}
