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：
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 else
103 {
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 JButton
163 {
164 public myJButton(String name,int size)
165 {
166 // TODO Auto-generated constructor stub
167 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 }
View Code
编程是一种快乐，享受代码带给我的乐趣！！！
