public class Tes
{
static TestField tf1;static TestField tf2;static Choice choice;static TestField tf3;
public static void main(String[]args)
{
Frame frame=new Frame("计算器");
frame.setSize(300,200);
frame.setLocation(300,200);
frame.addWindowListener(new Listener());
final TestField tf1=new TestField(8);
final Choice choice=new Choice();
choice.addItem("+");
choice.addItem("-");
choice.addItem("*");
choice.addItem("/");
final TestField tf2=new TestField(8);
Lable lable =new Lable("=");
final TestField tf3=new TestField(8);
Button button=new Button("计算器");
frame.add(tf1);
frame.add(choice);
frame.add(tf2);
frame.add(Lable);
frame.add(tf3);
frame.add(button);
frame.setLayout(new flowLayout());
{
@override
public void actionperformed(ActionEvent argo)
{
String s1=tf1.get Test();
String s2=tf2.getTest();
String ch=Choice.getSelectedItem();
double d1=Double.parseDouble(s1);
double d2=Double.parseDouble(s2);
double d=0;
if(ch.equals("+"))
{
d=d1+d2;
}
else if(ch.equals("-"))
{
d=d1*d2;
}
else
{
d=d1/d2;
}
tf3.setTest(d+"");
}
})
frame.setVisible(true);
}
}
原文：http://www.cnblogs.com/zql0514/p/4856710.html