package keshe;
import java.util.*;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
class Calculater extends JFrame implements ActionListener{
JTextField x;
String preOperater = "";
double sum = 0 ;
public Calculater(String title){
super(title);
this.setBounds(150,150,650,200);
this.setDefaultCloseOperation(EXIT_ON_CLOSE);
x = new JTextField(50);
this.getContentPane().add(x,"North");
String buttoned[]={"0","1","2","3",
"+/-",".","C","退格","求倒 ",
"4","5","6","7","+","-",
"*","/","%","8","9","=",
"sqrt","pow","log","cos","tan"," exp"};
JPanel p = new JPanel();
p.setLayout(new GridLayout(3,9,10,10));
for(int k=0;k<buttoned.length;k++) {
JButton b=new JButton(buttoned[k]);

}
else if(Command.equals("log")){
log();
}
else if(Command.equals("cos")){
cos();
}
else if(Command.equals("tan")){
tan();
}
else if(Command.equals("exp")){
exp();
}
else if(Command.equals("求倒")){
qiudao();
}
else if(Command.equals("C")){
clear();
}
else{
doOperation();
x.setText("");
}}
catch(Exception ex) {sum=0; x.setText("");}
}
void xiaoshu(){
String s=x.getText();
if(s.indexOf(".")==-1){
x.setText(s+".");
}
}
void fuhao(){
String s=x.getText();
if(s.indexOf("-")==-1){
x.setText("-"+x.getText());
}
}
void backspace(){
String s=x.getText();
if(s.length()>0){
x.setText(s.substring(0,s.length()-1));
}
}
void dengyu(){
doOperation();
x.setText(""+sum);
preOperater="";
}
void sqrt(){
double m=Double.parseDouble(x.getText());
if (m<0)
x.setText("负数不能开根号");
else
x.setText(""+Math.sqrt(m));
}
void log(){
double m=Double.parseDouble(x.getText());
if (m<0)
x.setText("负数不能进行自然对数运算");
else
x.setText(""+Math.log(m));
}
void cos(){
double m=Double.parseDouble(x.getText());
x.setText(""+Math.cos(m));
}
void tan(){
double m=Double.parseDouble(x.getText());
x.setText(""+Math.tan(m));
}
void exp(){
double m=Double.parseDouble(x.getText());
x.setText(""+Math.exp(m));
}

void qiudao(){
if (Double.parseDouble(x.getText())==0)
x.setText("除数不能为零");
else{
x.setText(""+1/(Double.parseDouble(x.getText())));
preOperater="";
}
}
void clear(){
sum=0;
x.setText("");
preOperater="";
}
void doOperation(){
double m=Double.parseDouble(x.getText());
if(preOperater.equals("")) sum=m;
if(preOperater.equals("+")) sum=sum+m;
if(preOperater.equals("-")) sum=sum-m;
if(preOperater.equals("*")) sum=sum*m;
if(preOperater.equals("/")) sum=sum/m;
if(preOperater.equals("%")) sum=sum%m;
if(preOperater.equals("pow")) sum=Math.pow(sum, m);
}
// }
public static void main(String a[]){
new Calculater("计算器");
}
}

我实行1+1出现的结果