import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.lang.*;
import javax.swing.*;
import java.util.*;
public class CalculatorA {
private JFrame jf;
private JButton[] jbs;
private JTextField jtf;
private JButton clear;
private double num1,num2,jieguo;
private char c;
/**
* 构造方法实例化属性
*
*/
public CalculatorA(){
jf=new JFrame("我的计算器v1.0");
jtf=new JTextField(20);
clear=new JButton("clear");
jbs=new JButton[16];
String str="123+456-789*0./=";
for(int i=0; i<str.length(); i++){
jbs[i]=new JButton(str.charAt(i)+"");
}
init();
addEventHandler();
// setFont();
// setColor();
showMe();
}
/**
* 布局图形界面
*
*/
public void init(){
// jf.setLayout(manager)
JPanel jp1=new JPanel();
jp1.add(jtf);
JPanel jp2=new JPanel();
jp2.setLayout(new GridLayout(4,4));
for(int i=0; i<16; i++){
jp2.add(jbs[i]);
}
JPanel jp3=new JPanel();
jp3.add(clear);
jf.add(jp1,BorderLayout.NORTH);
jf.add(jp2,BorderLayout.CENTER);
jf.add(jp3,BorderLayout.SOUTH);
}
public void setFont(){
}
public void setColor(){
}
public void addEventHandler(){
ActionListener lis=new ActionListener(){
public void actionPerformed(ActionEvent e){
// TODO Auto-generated method stub
JButton jb=(JButton)e.getSource();
// String key=(String)e.getActionCommand();
String str =jb.getText().trim();//把字符串的首尾空格去掉!
// String str2=e.getActionCommand().trim();//返回事件源的文本内容
if("0123456789.".indexOf(str)!=-1){//如果是数字或点号
jtf.setText(jtf.getText()+str);
return;
}
if("+-*/".indexOf(str)!=-1){
num1=Double.parseDouble(jtf.getText());
jtf.setText("");
c=str.charAt(0);
jtf.setText("");
return ;
}
if(str.equals("=")){
num2=Double.parseDouble(jtf.getText());
// jtf.setText("");
switch(c){
case '+': jieguo=num1+num2;break;
case '-': jieguo=num1-num2;break;
case '*': jieguo=num1*num2; break;
case '/': jieguo=num1/num2;break;
}
jtf.setText(Double.toString(jieguo));
return;
}
if(e.getActionCommand().equals("clear")){
jtf.setText("");
return;
}
}
};
for(int i=0; i<jbs.length; i++){
jbs[i].addActionListener(lis);
}
clear.addActionListener(lis);
}
public void showMe(){
jf.pack();
jf.setVisible(true);
jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
public static void main(String[] args){
new CalculatorA();
}
}