下面是我写的java计算器的代码,可是生成的计算器中,按键反映都是 "0.0 ",高手帮忙啊!
到底是怎么会事啊?
import java.awt.*;
import java.awt.event.*;
public class Calculator extends Frame implements ActionListener {
private double a=0,b=0,sum=0;
int flag=0,count=0,p=1;
char mode= '? ';//运算符
private TextField display =new TextField();
private Button one =new Button( "1 ");
private Button two =new Button( "2 ");
private Button three =new Button( "3 ");
private Button four =new Button( "4 ");
private Button five =new Button( "5 ");
private Button six =new Button( "6 ");
private Button seven =new Button( "7 ");
private Button eight =new Button( "8 ");
private Button nine =new Button( "9 ");
private Button zero =new Button( "0 ");
private Button point =new Button( ". ");
private Button add =new Button( "+ ");
private Button sub =new Button( "- ");
private Button mul =new Button( "* ");
private Button div =new Button( "/ ");
private Button result =new Button( "= ");
private Button clr =new Button( "CLR ");
private Button quit =new Button( "quit ");
private Label lable =new Label( "计算器 ");
private class WindowCloser extends WindowAdapter
{
public void windowClosing(WindowEvent e)
{
System.exit(0);
}
}
private void setup()//布局管理
{
Panel top= new Panel();
top.setLayout(new GridLayout(2,1));
top.add(lable);
top.add(display);
Panel number=new Panel();
number.setLayout(new GridLayout(6,3));
number.add(one);
number.add(two);
number.add(three);
number.add(four);
number.add(five);
number.add(six);
number.add(seven);
number.add(eight);
number.add(nine);
number.add(zero);
number.add(add);
number.add(sub);
number.add(point);
number.add(mul);
number.add(div);
number.add(result);
number.add(clr);
number.add(quit);
setLayout(new BorderLayout());
add( "North ",top);
add( "South ",number);
}
public Calculator()
{//构造方法
super( "计算器 ");
setup();
one.addActionListener(this);
two.addActionListener(this);
three.addActionListener(this);
four.addActionListener(this);
five.addActionListener(this);
six.addActionListener(this);
seven.addActionListener(this);
eight.addActionListener(this);