java设计之简单的JAVA计算器

       做这个东西主要是为了练习一下以前学习过的java Swing,所以那些复杂的算法就没有加载到里面去........

       先展示一下效果....，额，当然不是这个样子....

       ---》

代码：

    

package dialog_color;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.math.BigInteger;
import java.util.ArrayList;
import java.util.List;
import java.util.Stack;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import javax.swing.BorderFactory;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.UIManager;
 /*简易计算器*/ 
public class Simple_jisuanqi {
  public static  void main(String args []) {

       Caculate mycacu = new Caculate();
     //  Container con =mycacu.getContentPane();
       mycacu.setTitle("GXjun计算器");
       
  }
}
class Caculate extends JFrame implements ActionListener
{
     Container  mycon;    //设置重量级容器
     JPanel  jpanel_1,jpanel_2,jpanel_3;    //设置轻量级布局
     myJButton button []= new myJButton [20];
     JTextField mytext;
     JLabel label;
    GridLayout grid = new GridLayout(4,4);
    Caculate(){          //构造函数
        mycon = getContentPane();
        jpanel_1 = new JPanel();  /*默认的格式为FlowLayout*/
        jpanel_2 =new JPanel();
        jpanel_3 = new JPanel();
        jpanel_2.setLayout(grid);
        mytext = new JTextField(14);
        mytext.setEditable(false);   //设置成为不能
        mytext.setFont(new Font("Arial",Font.BOLD,22));
       /* for(int i=0;i<20;i++)
         button[i]=new myJButton(null);*/
        button[0] = new myJButton(" 后退  ",22);
        button[0].addActionListener(this);
        button[1] = new myJButton("  归零  ",22);
        button[1].addActionListener(this);
        jpanel_1.add(button[0]);
        jpanel_1.add(mytext);
        jpanel_1.add(button[1]);
        label = new JLabel(new ImageIcon("C:\Users\Administrator.USERSWO-MKA59UH\Desktop\java\bin\dialog_color\a.jpg"));
       // label = new JLabel(new ImageIcon("D:\2\2.gif"));
        jpanel_3.add(label);
        for(int i=2;i<12;i++)
            button[i]=new myJButton(" "+i+" ",26);
        char str[][]={{'7','8','9','/'},{'4','5','6','*'},{'1','2','3','-'},{'0','.','+','='}};
        for(int i=0;i<4;i++)
          for(int j=0;j<4;j++){
              button[2+i*4+j] =new myJButton("  "+str[i][j]+"  ",26);
              button[2+i*4+j].addActionListener(this);
              jpanel_2.add(button[2+i*4+j]);
            }
       mycon.add(jpanel_1,BorderLayout.CENTER);
       mycon.add(jpanel_3,BorderLayout.NORTH);
       mycon.add(jpanel_2,BorderLayout.SOUTH);
         init();
   }
   void init() /*相关组件的一系列的初始化*/
   {
     setBounds(100, 100, 477, 280);
     setVisible(true);
     setResizable(false);
     setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
   }
   String str ="";   
@Override
public void actionPerformed(ActionEvent e) {
    // TODO Auto-generated method stub
    //System.out.println(e.getActionCommand());
     if(e.getSource()==button[0]||e.getSource()==button[1])
      {
            if(e.getSource()==button[0]){
              System.out.println(str);
            if(!str.isEmpty()){     
              str=str.substring(0, str.length()-1) ; //后退一格 
             }
            }
            else str="";
      }
     else
     {
      if(e.getSource()==button[17]){ 
        //等于号的时候，又该如何处理？  正则表达式
        //System.out.println(e.getActionCommand());
         /*System.out.println(sove_calc(str));*/
          Double judge=sove_calc(str.trim());
          if(judge==Double.MAX_VALUE)
          {
              mytext.setText("error!");
              validate();
              return;
          }
          else str=judge.toString();
      }
      else{
          str+=e.getActionCommand().toString().trim();
      }
     }
     if(str.isEmpty())  mytext.setText("0");
     else mytext.setText(str);
        validate();
}
private Double sove_calc(String str)
{
    /*怎么提起出字符串里面的运算符号呢*/
    Pattern mypa = Pattern.compile("\+|\-|\*|\/");
      Matcher mtma = mypa.matcher(str);
      List<String> listhoge = new ArrayList();
      while(mtma.find()) listhoge.add(mtma.group());
       String [] hoge = listhoge.toArray(new String [0]);  //获取运算符号
   /*突然遇到一个问题怎么从字符串提起浮点型数据呢？*/
     Pattern mypart = Pattern.compile("\.\d|\d+(\.\d+)?");    
     Matcher mtmatcher =mypart.matcher(str);
     List<String> listval = new ArrayList();
     while(mtmatcher.find())
       listval.add(mtmatcher.group());
     String [] val=listval.toArray(new String[0]); 
     double sum=Double.parseDouble(val[0]);
    for( int i=0;i<hoge.length;i++)
    {
         System.out.println(hoge[i].charAt(0));
       switch(hoge[i].charAt(0))
       {
         case '+':  sum += Double.parseDouble(val[i+1]); break;
         case '-':  sum -= Double.parseDouble(val[i+1]); break;
         case '*':  sum *= Double.parseDouble(val[i+1]); break;
         case '/':
         {
            Double tem=Double.parseDouble(val[i+1]);
            if(tem.equals(0))  return Double.MAX_VALUE;
            sum/=tem;
            break;
         }
         default :  System.out.println("error!"); break;
       }
   }
  return sum;
}
}
class  myJButton extends JButton
{
  public myJButton(String name,int size) 
  {
        // TODO Auto-generated constructor stub
      super(name);
      setFont(new Font("仿宋",Font.BOLD,size));
    setMargin(new Insets(2,2,2,2));
    setBorder(BorderFactory.createRaisedBevelBorder());
    setBackground(Color.LIGHT_GRAY);
  }     
}