1 package dialog_color;  2   3 import java.awt.BorderLayout;  4 import java.awt.Color;  5 import java.awt.Container;  6 import java.awt.FlowLayout;  7 import java.awt.Font;  8 import java.awt.GridLayout;  9 import java.awt.Insets; 10 import java.awt.event.ActionEvent; 11 import java.awt.event.ActionListener; 12 import java.math.BigInteger; 13 import java.util.ArrayList; 14 import java.util.List; 15 import java.util.Stack; 16 import java.util.regex.Matcher; 17 import java.util.regex.Pattern; 18  19 import javax.swing.BorderFactory; 20 import javax.swing.ImageIcon; 21 import javax.swing.JButton; 22 import javax.swing.JFrame; 23 import javax.swing.JLabel; 24 import javax.swing.JPanel; 25 import javax.swing.JTextField; 26 import javax.swing.UIManager; 27  /*简易计算器*/  28 public class Simple_jisuanqi { 29   public static  void main(String args []) { 30  31        Caculate mycacu = new Caculate(); 32      //  Container con =mycacu.getContentPane(); 33        mycacu.setTitle("GXjun计算器"); 34         35   } 36 } 37 class Caculate extends JFrame implements ActionListener 38 { 39      Container  mycon;    //设置重量级容器 40      JPanel  jpanel_1,jpanel_2,jpanel_3;    //设置轻量级布局 41      myJButton button []= new myJButton [20]; 42      JTextField mytext; 43      JLabel label; 44     GridLayout grid = new GridLayout(4,4); 45     Caculate(){          //构造函数 46         mycon = getContentPane(); 47         jpanel_1 = new JPanel();  /*默认的格式为FlowLayout*/ 48         jpanel_2 =new JPanel(); 49         jpanel_3 = new JPanel(); 50         jpanel_2.setLayout(grid); 51         mytext = new JTextField(14); 52         mytext.setEditable(false);   //设置成为不能 53         mytext.setFont(new Font("Arial",Font.BOLD,22)); 54        /* for(int i=0;i<20;i++) 55          button[i]=new myJButton(null);*/ 56         button[0] = new myJButton(" 后退  ",22); 57         button[0].addActionListener(this); 58         button[1] = new myJButton("  归零  ",22); 59         button[1].addActionListener(this); 60         jpanel_1.add(button[0]); 61         jpanel_1.add(mytext); 62         jpanel_1.add(button[1]); 63         label = new JLabel(new ImageIcon("C:\\Users\\Administrator.USERSWO-MKA59UH\\Desktop\\java\\bin\\dialog_color\\a.jpg")); 64        // label = new JLabel(new ImageIcon("D:\\2\\2.gif")); 65         jpanel_3.add(label); 66         for(int i=2;i<12;i++) 67             button[i]=new myJButton(" "+i+" ",26); 68         char str[][]={{‘7‘,‘8‘,‘9‘,‘/‘},{‘4‘,‘5‘,‘6‘,‘*‘},{‘1‘,‘2‘,‘3‘,‘-‘},{‘0‘,‘.‘,‘+‘,‘=‘}}; 69         for(int i=0;i<4;i++) 70           for(int j=0;j<4;j++){ 71               button[2+i*4+j] =new myJButton("  "+str[i][j]+"  ",26); 72               button[2+i*4+j].addActionListener(this); 73               jpanel_2.add(button[2+i*4+j]); 74             } 75        mycon.add(jpanel_1,BorderLayout.CENTER); 76        mycon.add(jpanel_3,BorderLayout.NORTH); 77        mycon.add(jpanel_2,BorderLayout.SOUTH); 78          init(); 79    } 80    void init() /*相关组件的一系列的初始化*/ 81    { 82      setBounds(100, 100, 477, 280); 83      setVisible(true); 84      setResizable(false); 85      setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);  86    } 87    String str ="";    88 @Override 89 public void actionPerformed(ActionEvent e) { 90     // TODO Auto-generated method stub 91     //System.out.println(e.getActionCommand()); 92      if(e.getSource()==button[0]||e.getSource()==button[1]) 93       { 94             if(e.getSource()==button[0]){ 95               System.out.println(str); 96             if(!str.isEmpty()){      97               str=str.substring(0, str.length()-1) ; //后退一格  98              } 99             }100             else str="";101       }102      else103      {104       if(e.getSource()==button[17]){ 105         //等于号的时候，又该如何处理？  正则表达式106         //System.out.println(e.getActionCommand());107          /*System.out.println(sove_calc(str));*/108           Double judge=sove_calc(str.trim());109           if(judge==Double.MAX_VALUE)110           {111               mytext.setText("error!");112               validate();113               return;114           }115           else str=judge.toString();116       }117       else{118           str+=e.getActionCommand().toString().trim();119       }120      }121      if(str.isEmpty())  mytext.setText("0");122      else mytext.setText(str);123         validate();124 }125 private Double sove_calc(String str)126 {127     /*怎么提起出字符串里面的运算符号呢*/128     Pattern mypa = Pattern.compile("\\+|\\-|\\*|\\/");129       Matcher mtma = mypa.matcher(str);130       List<String> listhoge = new ArrayList();131       while(mtma.find()) listhoge.add(mtma.group());132        String [] hoge = listhoge.toArray(new String [0]);  //获取运算符号133    /*突然遇到一个问题怎么从字符串提起浮点型数据呢？*/134      Pattern mypart = Pattern.compile("\\.\\d|\\d+(\\.\\d+)?");    135      Matcher mtmatcher =mypart.matcher(str);136      List<String> listval = new ArrayList();137      while(mtmatcher.find())138        listval.add(mtmatcher.group());139      String [] val=listval.toArray(new String[0]); 140      double sum=Double.parseDouble(val[0]);141     for( int i=0;i<hoge.length;i++)142     {143          System.out.println(hoge[i].charAt(0));144        switch(hoge[i].charAt(0))145        {146          case ‘+‘:  sum += Double.parseDouble(val[i+1]); break;147          case ‘-‘:  sum -= Double.parseDouble(val[i+1]); break;148          case ‘*‘:  sum *= Double.parseDouble(val[i+1]); break;149          case ‘/‘:150          {151             Double tem=Double.parseDouble(val[i+1]);152             if(tem.equals(0))  return Double.MAX_VALUE;153             sum/=tem;154             break;155          }156          default :  System.out.println("error!"); break;157        }158    }159   return sum;160 }161 }162 class  myJButton extends JButton163 {164   public myJButton(String name,int size) 165   {166         // TODO Auto-generated constructor stub167       super(name);168       setFont(new Font("仿宋",Font.BOLD,size));169     setMargin(new Insets(2,2,2,2));170     setBorder(BorderFactory.createRaisedBevelBorder());171     setBackground(Color.LIGHT_GRAY);172   }     173 }