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....

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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);
   }
 }