1 package mycalculator;
2 /*
3 *
4 * 3---3 会有异常
5 *
6 *
7 *
8 * */
9 import java.awt.*;
10 import java.awt.event.*;
11 import javax.swing.*;
12 import java.util.*;
13
14 public class Calculator extends JFrame implements ActionListener, KeyListener,
15 MouseListener {
16 final int WIDTH = 440, HEIGHT = 350;
17 GridLayout gridLayout = new GridLayout(4, 4, 5, 5); // 勿忘初始化 不初始化不会报错，但面板是空的
18 BorderLayout borderLayout = new BorderLayout();
19 FlowLayout flowLayout = new FlowLayout();
20 Container container;
21 // Container cont;
22 JPanel panel, buttonPanel;
23 JButton[] buttons;
24 String[] name;
25 JTextField textField;
26 boolean cleared = true;
27
28 public Calculator() {
29 super("Calculator");
30 container = getContentPane();
31 // Cont = getContentPane();
32 // Cont.setLayout(borderLayout);
33 buttonPanel = new JPanel();
34 panel = new JPanel();
35 // container = new Container();
36 // Cont.add(container, borderLayout.CENTER);
37 // panel.setSize(380,380);
38 buttonPanel.setLayout(gridLayout);
39 textField = new JTextField(15);
40 textField.setFont(textField.getFont().deriveFont(Font.BOLD,
41 (float) 32.0));
42 textField.setEditable(false);
43 textField.setHorizontalAlignment(JTextField.RIGHT);
44 textField.setBackground(Color.GRAY);
45 textField.setForeground(Color.WHITE);
46 panel.add(textField);
47 // textField.setSize(getBounds().width,getBounds().height/3);
48 // textField.setFont(textField.getFont().deriveFont(99));
49 /*
50 * container.setLayout(borderLayout); container.add(textField,
51 * borderLayout.NORTH); container.add(cont, borderLayout.CENTER);
52 */
53 container.setLayout(borderLayout);
54 // container.add(textField);
55 container.add(panel, borderLayout.NORTH);
56 container.add(buttonPanel, borderLayout.CENTER);
57 // container.setSize(getBounds().width,getBounds().height);
58 // cont.setSize(getBounds().width,getBounds().height/3*2);
59 buttons = new JButton[16];
60 name = new String[] { "7", "8", "9", "/", "4", "5", "6", "*", "1", "2",
61 "3", "-", "0", ".", "=", "+" };
62 for (int index = 0; index <= 15; index++) {
63 buttons[index] = new JButton(name[index]);
64 buttons[index].addActionListener(this);
65 buttons[index].setBackground(Color.GRAY);
66 buttons[index].setForeground(Color.WHITE);
67 buttons[index].addKeyListener(this);
68 buttons[index].addMouseListener(this);
69 buttons[index].setFont(buttons[index].getFont().deriveFont(
70 Font.BOLD, (float) 32.0));
71 // buttons[index].setSize(200, 200);
72 buttonPanel.add(buttons[index]);
73 }
74 this.addKeyListener(this);
75 setSize(WIDTH, HEIGHT);
76 Toolkit kit = Toolkit.getDefaultToolkit(); // 定义工具包
77 Dimension screenSize = kit.getScreenSize(); // 获取屏幕的尺寸
78 int screenWidth = screenSize.width; // 获取屏幕的宽
79 int screenHeight = screenSize.height; // 获取屏幕的高
80 setLocation(screenWidth / 2 - WIDTH / 2, screenHeight / 2 - HEIGHT / 2);// 设置窗口居中显示
81 // setLocation(600, 250);
82 setVisible(true);
83 setFocusable(true);
84 }
85
86 String calculate(String str) {
87 String result = "Wrong Expression";
88 String temp = "";
89 if (str.charAt(0) != ‘-‘
90 && !(str.charAt(0) <= ‘9‘ && str.charAt(0) >= ‘0‘)) {
91 return result;
92 }
93 LinkedList<Double> list = new LinkedList<Double>();
94 LinkedList<Character> optList = new LinkedList<Character>();
95 Double doubleTemp;
96 boolean isFormerOpt = true;
97 for (int index = 0; index <= str.length() - 1; index++) {
98 if (index == 0) {
99 isFormerOpt = true;
100 } else {
101 if (str.charAt(index - 1) > ‘9‘ || str.charAt(index - 1) < ‘0‘) {
102 isFormerOpt = true;
103 } else {
104 isFormerOpt = false;
105 }
106 }
107 if (str.charAt(index) != ‘+‘ && str.charAt(index) != ‘*‘
108 && str.charAt(index) != ‘/‘
109 && (!(str.charAt(index) == ‘-‘ && isFormerOpt == false))) {
110 temp += str.charAt(index);
111 } else {
112 doubleTemp = new Double(temp);
113 list.add(doubleTemp);
114 temp = "";
115 optList.add(str.charAt(index));
116 }
117 }
118 doubleTemp = new Double(temp);
119 list.add(doubleTemp);
120 temp = "";
121 /*
122 * for (int index = 0; index <= list.size() - 1; index++) {
123 * System.out.println(list.get(index)); } for (int index = 0; index <=
124 * optList.size() - 1; index++) {
125 * System.out.println(optList.get(index)); }
126 */
127 boolean isThereHigherOpt = true;
128 while (isThereHigherOpt == true) {
129 /*
130 * for (Iterator<Character> it = optList.iterator(); it.hasNext();)
131 * { if (it.next() == ‘*‘ || it.next() == ‘/‘) { isThereHigherOpt =
132 * true; int index = optList.indexOf(it.next());
133 *
134 * break; } }
135 */
136 isThereHigherOpt = false;
137 for (int index = 0; index <= optList.size() - 1; index++) {
138 if (optList.get(index) == ‘*‘) {
139 Double t = list.get(index) * list.get(index + 1);
140 list.remove(index + 1);
141 list.set(index, t);
142 optList.remove(index);
143 isThereHigherOpt = true;
144 break;
145 }
146 if (optList.get(index) == ‘/‘) {
147 Double t = list.get(index) / list.get(index + 1);
148 list.remove(index + 1);
149 list.set(index, t);
150 optList.remove(index);
151 isThereHigherOpt = true;
152 break;
153 }
154 }
155 }
156 while (optList.isEmpty() == false) {
157 for (int index = 0; index <= optList.size() - 1; index++) {
158 if (optList.get(index) == ‘+‘) {
159 Double t = list.get(index) + list.get(index + 1);
160 list.remove(index + 1);
161 list.set(index, t);
162 optList.remove(index);
163 break;
164 }
165 if (optList.get(index) == ‘-‘) {
166 Double t = list.get(index) + 0.0 - list.get(index + 1);
167 list.remove(index + 1);
168 list.set(index, t);
169 optList.remove(index);
170 break;
171 }
172 }
173 }
174 /*
175 * System.out.println("/////////////////////////////////"); for (int
176 * index = 0; index <= optList.size() - 1; index++) { //
177 * System.out.println(index); System.out.println(list.get(index));
178 * System.out.println(optList.get(index));
179 * System.out.println(list.get(index + 1)); }
180 */
181 if (list.size() == 1) {
182 result = list.get(0).toString();
183 }
184 return result;
185 }
186
187 void addText(char ch) {
188 if (cleared == true && ((ch <= ‘9‘ && ch >= ‘0‘))) {
189 textField.setText("");
190 cleared = false;
191 }
192 String str = textField.getText();
193 if (ch != ‘=‘) {
194 if (str.length() > 0) {
195 if (str.charAt(str.length() - 1) <= ‘9‘
196 && str.charAt(str.length() - 1) >= ‘0‘) {
197 if (ch != ‘.‘) {
198 textField.setText(str + ch);
199 } else {
200 boolean isTherePoint = false;
201 int i = str.length() - 1;
202 while (i >= 0) {
203 if (str.charAt(i) == ‘*‘ || str.charAt(i) == ‘/‘
204 || str.charAt(i) == ‘+‘
205 || str.charAt(i) == ‘-‘) {
206 break;
207 }
208 if (str.charAt(i) == ‘.‘) {
209 isTherePoint = true;
210 break;
211 }
212 i--;
213 }
214 if (isTherePoint == false) {
215 textField.setText(str + ch);
216 }
217 }
218 } else {
219 if ((ch <= ‘9‘ && ch >= ‘0‘) || ch == ‘-‘) {
220 textField.setText(str + ch);
221 }
222 }
223 } else {
224 if (ch == ‘-‘ || (ch <= ‘9‘ && ch >= ‘0‘))
225 textField.setText(str + ch);
226 }
227 cleared = false;
228 } else {
229 if (cleared == true) {
230 textField.setText("");
231 } else {
232 str = textField.getText();
233 //System.out.println(str);
234 textField.setText("");
235 if (str.length() > 0) {
236 if (str.charAt(str.length() - 1) <= ‘9‘
237 && str.charAt(str.length() - 1) >= ‘0‘) {
238 textField.setText(calculate(str));
239 } else {
240 textField.setText("Wrong Expression");
241 }
242 }
243 }
244 cleared = true;
245 }
246 }
247
248 public void actionPerformed(ActionEvent event) {
249 Object source = event.getSource();
250 if (source.getClass() == JButton.class) {
251 JButton button = (JButton) source;
252 char ch = button.getText().charAt(0);
253 addText(ch);
254 }
255 }
256
257 public void keyPressed(KeyEvent e) {
258 }
259
260 public void keyReleased(KeyEvent e) {
261 }
262
263 public void keyTyped(KeyEvent e) {
264 char ch = e.getKeyChar();
265 if (ch == ‘ ‘) {
266 System.exit(EXIT_ON_CLOSE);
267 }
268 if (ch == KeyEvent.VK_ENTER) {
269 buttons[14].setBackground(Color.LIGHT_GRAY);
270 for (int i = 0; i <= name.length - 1; i++) {
271 if (i != 14) {
272 buttons[i].setBackground(Color.GRAY);
273 }
274 }
275 addText(‘=‘);
276 return;
277 }
278 for (int index = 0; index <= name.length - 1; index++) {
279 if (ch == name[index].charAt(0)) {
280 // System.out.println(ch);
281 buttons[index].setBackground(Color.LIGHT_GRAY);
282 for (int i = 0; i <= name.length - 1; i++) {
283 if (i != index) {
284 buttons[i].setBackground(Color.GRAY);
285 }
286 }
287 addText(ch);
288 break;
289 }
290 }
291 }
292
293 public void mouseClicked(MouseEvent event) {
294 }
295
296 public void mouseEntered(MouseEvent event) {
297 Object source = event.getSource();
298 if (source.getClass() == JButton.class) {
299 JButton button = (JButton) source;
300 // System.out.println("hey");
301 button.setBackground(Color.LIGHT_GRAY);
302 }
303 }
304
305 public void mousePressed(MouseEvent event) {
306 }
307
308 public void mouseReleased(MouseEvent event) {
309 }
310
311 public void mouseExited(MouseEvent event) {
312 Object source = event.getSource();
313 if (source.getClass() == JButton.class) {
314 JButton button = (JButton) source;
315 // System.out.println("hey");
316 button.setBackground(Color.GRAY);
317 }
318 }
319
320 public static void main(String[] args) {
321 Calculator c = new Calculator();
322 // c.addKeyListener(c);
323 c.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
324 }
325 }
计算9/3-1*2+-1
的结果=0。
时间： 2024-11-12 18:36:46