devbox
笔触狂放9
这个屌丝很懒，什么也没留下！
关注作者
热门标签
热门文章
当前位置:   article > 正文

Java:实现简单的计算器(加减乘除)_java编写简易计算器实现加减乘除

作者：笔触狂放9 | 2024-03-20 18:38:27

赞

踩

java编写简易计算器实现加减乘除

基本要求：

1、采用Java Application方式建立应用程序框架
2、仿照Windows计算器，利用多种布局方式实现界面设计
3、完成简单的整数加、减、乘、除运算

简单计算器的界面如下：

 代码：

  1. import java.awt.BorderLayout;
  2. import java.awt.Color;
  3. import java.awt.Container;
  4. import java.awt.Dimension;
  5. import java.awt.Font;
  6. import java.awt.GridLayout;
  7. import java.awt.event.ActionEvent;
  8. import java.awt.event.ActionListener;
  9. import java.awt.event.WindowAdapter;
  10. import java.awt.event.WindowEvent;
  11.  
  12. import javax.swing.*;
  13.  
  14. public class Gui_Calculator {
  15. 	JFrame jFrame;//
  16. 	JLabel text,text2,text3,text4;//操作数1,运算符,操作数2,结果
  17. 	JButton b0,b1,b2,b3,b4,b5,b6,b7,b8,b9;//数字
  18. 	JButton b_add,b_sub,b_mul,b_div;//+,-,*,/
  19. 	JButton b_del,b_equal;//删除,=
  20. 	JPanel jPanel,jPanel2;//jPanel放操作数1,运算符,操作数2,结果 jPanel2放按钮
  21. 	Container contentPane;//
  22. 	Font font=new Font("微软黑体",Font.PLAIN,25);//设置字体为25磅的普通微软黑体
  23. 	double outcome=0;//初始化结果为零
  24. 	public Gui_Calculator() {
  25. 		jFrame=new JFrame("计算器");
  26. 		jFrame.setBounds(300, 200, 300, 400);//位置及大小
  27. 		jFrame.addWindowListener(new WindowAdapter(){//关闭窗口的监听
  28. 			public void windowClosing(WindowEvent e){
  29. 				System.out.println("系统退出！");
  30. 				System.exit(1);
  31. 			}
  32. 		});
  33. 		contentPane=jFrame.getContentPane();
  34. 		//文本框右对齐
  35. 		text=new JLabel(" ",SwingConstants.RIGHT);
  36. 		text.setFont(font);
  37. 		text2=new JLabel(" ",SwingConstants.RIGHT);
  38. 		text2.setFont(font);
  39. 		text3=new JLabel(" ",SwingConstants.RIGHT);
  40. 		text3.setFont(font);
  41. 		text4=new JLabel(" ",SwingConstants.RIGHT);
  42. 		text4.setFont(font);
  43. 		//数字button的创建及监听 b0~b9:内容与b0类似
  44. 		b0=new JButton("0");
  45. 		b0.setFont(font);
  46. 		b0.addActionListener(new ActionListener() {
  47. 			public void actionPerformed(ActionEvent e) {
  48. 				if(text2.getText()==" ") {//没有运算符 填写操作数1
  49. 					if(text.getText()==" ") {
  50. 						text.setText("");
  51. 					}
  52. 					text.setText(text.getText()+"0");
  53. 				}
  54. 				else {//有运算符 填写操作数2
  55. 					if(text4.getText()==" ") {
  56. 						if(text3.getText()==" ") {
  57. 							text3.setText("");
  58. 						}
  59. 						text3.setText(text3.getText()+"0");
  60. 					}
  61. 				}
  62. 				if(text4.getText()!=" ") {//有运算结果 重新填写操作数1并清空运算符、操作数2、结果
  63. 					text.setText("0");
  64. 					text2.setText(" ");
  65. 					text3.setText(" ");
  66. 					text4.setText(" ");
  67. 				}
  68. 				
  69. 			}
  70. 		});
  71. 		
  72. 		b1=new JButton("1");
  73. 		b1.setFont(font);
  74. 		b1.addActionListener(new ActionListener() {
  75. 			public void actionPerformed(ActionEvent e) {
  76. 				if(text2.getText()==" ") {
  77. 					if(text.getText()==" ") {
  78. 						text.setText("");
  79. 					}
  80. 					text.setText(text.getText()+"1");
  81. 				}
  82. 				else {
  83. 					if(text4.getText()==" ") {
  84. 						if(text3.getText()==" ") {
  85. 							text3.setText("");
  86. 						}
  87. 						text3.setText(text3.getText()+"1");
  88. 					}
  89. 				}
  90. 				if(text4.getText()!=" ") {
  91. 					text.setText("1");
  92. 					text2.setText(" ");
  93. 					text3.setText(" ");
  94. 					text4.setText(" ");
  95. 				}
  96. 			}
  97. 		});
  98. 		
  99. 		b2=new JButton("2");
  100. 		b2.setFont(font);
  101. 		b2.addActionListener(new ActionListener() {
  102. 			public void actionPerformed(ActionEvent e) {
  103. 				if(text2.getText()==" ") {
  104. 					if(text.getText()==" ") {
  105. 						text.setText("");
  106. 					}
  107. 					text.setText(text.getText()+"2");
  108. 				}
  109. 				else {
  110. 					if(text4.getText()==" ") {
  111. 						if(text3.getText()==" ") {
  112. 							text3.setText("");
  113. 						}
  114. 						text3.setText(text3.getText()+"2");
  115. 					}
  116. 				}
  117. 				if(text4.getText()!=" ") {
  118. 					text.setText("2");
  119. 					text2.setText(" ");
  120. 					text3.setText(" ");
  121. 					text4.setText(" ");
  122. 				}
  123. 			}
  124. 		});
  125. 		
  126. 		b3=new JButton("3");
  127. 		b3.setFont(font);
  128. 		b3.addActionListener(new ActionListener() {
  129. 			public void actionPerformed(ActionEvent e) {
  130. 				if(text2.getText()==" ") {
  131. 					if(text.getText()==" ") {
  132. 						text.setText("");
  133. 					}
  134. 					text.setText(text.getText()+"3");
  135. 				}
  136. 				else {
  137. 					if(text4.getText()==" ") {
  138. 						if(text3.getText()==" ") {
  139. 							text3.setText("");
  140. 						}
  141. 						text3.setText(text3.getText()+"3");
  142. 					}
  143. 				}
  144. 				if(text4.getText()!=" ") {
  145. 					text.setText("3");
  146. 					text2.setText(" ");
  147. 					text3.setText(" ");
  148. 					text4.setText(" ");
  149. 				}
  150. 			}
  151. 		});
  152. 		
  153. 		b4=new JButton("4");
  154. 		b4.setFont(font);
  155. 		b4.addActionListener(new ActionListener() {
  156. 			public void actionPerformed(ActionEvent e) {
  157. 				if(text2.getText()==" ") {
  158. 					if(text.getText()==" ") {
  159. 						text.setText("");
  160. 					}
  161. 					text.setText(text.getText()+"4");
  162. 				}
  163. 				else {
  164. 					if(text4.getText()==" ") {
  165. 						if(text3.getText()==" ") {
  166. 							text3.setText("");
  167. 						}
  168. 						text3.setText(text3.getText()+"4");
  169. 					}
  170. 				}
  171. 				if(text4.getText()!=" ") {
  172. 					text.setText("4");
  173. 					text2.setText(" ");
  174. 					text3.setText(" ");
  175. 					text4.setText(" ");
  176. 				}
  177. 			}
  178. 		});
  179. 		
  180. 		b5=new JButton("5");
  181. 		b5.setFont(font);
  182. 		b5.addActionListener(new ActionListener() {
  183. 			public void actionPerformed(ActionEvent e) {
  184. 				if(text2.getText()==" ") {
  185. 					if(text.getText()==" ") {
  186. 						text.setText("");
  187. 					}
  188. 					text.setText(text.getText()+"5");
  189. 				}
  190. 				else {
  191. 					if(text4.getText()==" ") {
  192. 						if(text3.getText()==" ") {
  193. 							text3.setText("");
  194. 						}
  195. 						text3.setText(text3.getText()+"5");
  196. 					}
  197. 				}
  198. 				if(text4.getText()!=" ") {
  199. 					text.setText("5");
  200. 					text2.setText(" ");
  201. 					text3.setText(" ");
  202. 					text4.setText(" ");
  203. 				}
  204. 			}
  205. 		});
  206. 		
  207. 		b6=new JButton("6");
  208. 		b6.setFont(font);
  209. 		b6.addActionListener(new ActionListener() {
  210. 			public void actionPerformed(ActionEvent e) {
  211. 				if(text2.getText()==" ") {
  212. 					if(text.getText()==" ") {
  213. 						text.setText("");
  214. 					}
  215. 					text.setText(text.getText()+"6");
  216. 				}
  217. 				else {
  218. 					if(text4.getText()==" ") {
  219. 						if(text3.getText()==" ") {
  220. 							text3.setText("");
  221. 						}
  222. 						text3.setText(text3.getText()+"6");
  223. 					}
  224. 				}
  225. 				if(text4.getText()!=" ") {
  226. 					text.setText("6");
  227. 					text2.setText(" ");
  228. 					text3.setText(" ");
  229. 					text4.setText(" ");
  230. 				}
  231. 			}
  232. 		});
  233. 		
  234. 		b7=new JButton("7");
  235. 		b7.setFont(font);
  236. 		b7.addActionListener(new ActionListener() {
  237. 			public void actionPerformed(ActionEvent e) {
  238. 				if(text2.getText()==" ") {
  239. 					if(text.getText()==" ") {
  240. 						text.setText("");
  241. 					}
  242. 					text.setText(text.getText()+"7");
  243. 				}
  244. 				else {
  245. 					if(text4.getText()==" ") {
  246. 						if(text3.getText()==" ") {
  247. 							text3.setText("");
  248. 						}
  249. 						text3.setText(text3.getText()+"7");
  250. 					}
  251. 				}
  252. 				if(text4.getText()!=" ") {
  253. 					text.setText("7");
  254. 					text2.setText(" ");
  255. 					text3.setText(" ");
  256. 					text4.setText(" ");
  257. 				}
  258. 			}
  259. 		});
  260. 		
  261. 		b8=new JButton("8");
  262. 		b8.setFont(font);
  263. 		b8.addActionListener(new ActionListener() {
  264. 			public void actionPerformed(ActionEvent e) {
  265. 				if(text2.getText()==" ") {
  266. 					if(text.getText()==" ") {
  267. 						text.setText("");
  268. 					}
  269. 					text.setText(text.getText()+"8");
  270. 				}
  271. 				else {
  272. 					if(text4.getText()==" ") {
  273. 						if(text3.getText()==" ") {
  274. 							text3.setText("");
  275. 						}
  276. 						text3.setText(text3.getText()+"8");
  277. 					}
  278. 				}
  279. 				if(text4.getText()!=" ") {
  280. 					text.setText("8");
  281. 					text2.setText(" ");
  282. 					text3.setText(" ");
  283. 					text4.setText(" ");
  284. 				}
  285. 			}
  286. 		});
  287. 		
  288. 		b9=new JButton("9");
  289. 		b9.setFont(font);
  290. 		b9.addActionListener(new ActionListener() {
  291. 			public void actionPerformed(ActionEvent e) {
  292. 				if(text2.getText()==" ") {
  293. 					if(text.getText()==" ") {
  294. 						text.setText("");
  295. 					}
  296. 					text.setText(text.getText()+"9");
  297. 				}
  298. 				else {
  299. 					if(text4.getText()==" ") {
  300. 						if(text3.getText()==" ") {
  301. 							text3.setText("");
  302. 						}
  303. 						text3.setText(text3.getText()+"9");
  304. 					}
  305. 				}
  306. 				if(text4.getText()!=" ") {
  307. 					text.setText("9");
  308. 					text2.setText(" ");
  309. 					text3.setText(" ");
  310. 					text4.setText(" ");
  311. 				}
  312. 			}
  313. 		});
  314. 		//运算符button的创建及监听 b_add:+,b_sub:-,b_mul:*,b_div:/
  315. 		b_add=new JButton("+");
  316. 		b_add.setFont(font);
  317. 		b_add.addActionListener(new ActionListener() {
  318. 			public void actionPerformed(ActionEvent e) {
  319. 				if(text3.getText()==" ") {
  320. 					if(text.getText()!=" ") {
  321. 						text2.setText("+");
  322. 					}
  323. 				}
  324. 				if(text4.getText()!="不能除零！！！"&&text4.getText()!=" ") {
  325. 					text.setText(""+outcome);
  326. 					text2.setText("+");
  327. 					text3.setText(" ");
  328. 					text4.setText(" ");
  329. 				}
  330. 			}
  331. 		});
  332. 		
  333. 		b_sub=new JButton("-");
  334. 		b_sub.setFont(font);
  335. 		b_sub.addActionListener(new ActionListener() {
  336. 			public void actionPerformed(ActionEvent e) {
  337. 				if(text3.getText()==" ") {
  338. 					if(text.getText()!=" ") {
  339. 						text2.setText("-");
  340. 					}
  341. 				}
  342. 				if(text4.getText()!="不能除零！！！"&&text4.getText()!=" ") {
  343. 					text.setText(""+outcome);
  344. 					text2.setText("-");
  345. 					text3.setText(" ");
  346. 					text4.setText(" ");
  347. 				}
  348. 			}
  349. 		});
  350. 		
  351. 		b_mul=new JButton("*");
  352. 		b_mul.setFont(font);
  353. 		b_mul.addActionListener(new ActionListener() {
  354. 			public void actionPerformed(ActionEvent e) {
  355. 				if(text3.getText()==" ") {
  356. 					if(text.getText()!=" ") {
  357. 						text2.setText("*");
  358. 					}
  359. 				}
  360. 				if(text4.getText()!="不能除零！！！"&&text4.getText()!=" ") {
  361. 					text.setText(""+outcome);
  362. 					text2.setText("*");
  363. 					text3.setText(" ");
  364. 					text4.setText(" ");
  365. 				}
  366. 			}
  367. 		});
  368. 		
  369. 		b_div=new JButton("/");
  370. 		b_div.setFont(font);
  371. 		b_div.addActionListener(new ActionListener() {
  372. 			public void actionPerformed(ActionEvent e) {
  373. 				if(text3.getText()==" ") {
  374. 					if(text.getText()!=" ") {
  375. 						text2.setText("/");
  376. 					}
  377. 				}
  378. 				if(text4.getText()!="不能除零！！！"&&text4.getText()!=" ") {
  379. 					text.setText(""+outcome);
  380. 					text2.setText("/");
  381. 					text3.setText(" ");
  382. 					text4.setText(" ");
  383. 				}
  384. 			}
  385. 		});
  386. 		//删除button的创建及监听 b_del
  387. 		b_del=new JButton("CE");
  388. 		b_del.setFont(font);
  389. 		b_del.addActionListener(new ActionListener() {
  390. 			public void actionPerformed(ActionEvent e) {
  391. 				text.setText(" ");
  392. 				text2.setText(" ");
  393. 				text3.setText(" ");
  394. 				text4.setText(" ");
  395. 			}
  396. 		});
  397. 		//等于button的创建及监听 b_equal
  398. 		b_equal=new JButton("=");
  399. 		b_equal.setFont(font);
  400. 		b_equal.addActionListener(new ActionListener() {
  401. 			public void actionPerformed(ActionEvent e) {
  402. 				if(text3.getText()!=" ") {//有操作数2 进行运算
  403. 					switch (text2.getText()){
  404. 					case "+"://加
  405. 						outcome=Double.valueOf(text.getText().trim())+Double.valueOf(text3.getText().trim());
  406. 						text4.setText("="+outcome);
  407. 						break;
  408. 					case "-"://减
  409. 						outcome=Double.valueOf(text.getText().trim())-Double.valueOf(text3.getText().trim());
  410. 						text4.setText("="+outcome);
  411. 						break;
  412. 					case "*"://乘
  413. 						outcome=Double.valueOf(text.getText().trim())*Double.valueOf(text3.getText().trim());
  414. 						text4.setText("="+outcome);
  415. 						break;
  416. 					case "/"://除
  417. 						if(Integer.valueOf(text3.getText())==0) {//除数为零
  418. 							text4.setText("不能除零！！！");
  419. 						}
  420. 						else {//除数不为零
  421. 							outcome=Double.valueOf(text.getText().trim())/Double.valueOf(text3.getText().trim());
  422. 							text4.setText("="+outcome);
  423. 						}
  424. 						break;
  425. 					}
  426. 				}
  427. 				if(text2.getText()==" "&&text.getText()!=" ") {//没有运算符 有操作数1 直接等于操作数1
  428. 					outcome=Double.valueOf(text.getText());
  429. 					text4.setText("="+outcome);
  430. 				}
  431. 			}
  432. 		});
  433. 		
  434. 		jPanel=new JPanel();
  435. 		jPanel2=new JPanel();
  436. 		jPanel.setLayout(new GridLayout(4,1));
  437. 		jPanel2.setLayout(new GridLayout(4,4));
  438. 		//添加组件
  439. 		jPanel.add(text);
  440. 		jPanel.add(text2);
  441. 		jPanel.add(text3);
  442. 		jPanel.add(text4);
  443. 		jPanel2.add(b_add);
  444. 		jPanel2.add(b_sub);
  445. 		jPanel2.add(b_mul);
  446. 		jPanel2.add(b_div);
  447. 		jPanel2.add(b9);
  448. 		jPanel2.add(b0);
  449. 		jPanel2.add(b_del);
  450. 		jPanel2.add(b_equal);
  451. 		jPanel2.add(b5);
  452. 		jPanel2.add(b6);
  453. 		jPanel2.add(b7);
  454. 		jPanel2.add(b8);
  455. 		jPanel2.add(b1);
  456. 		jPanel2.add(b2);
  457. 		jPanel2.add(b3);
  458. 		jPanel2.add(b4);
  459. 		contentPane.add(jPanel,BorderLayout.NORTH);
  460. 		contentPane.add(jPanel2);
  461. 		jFrame.show();
  462. 	}
  463. 	public static void main(String[] args) {
  464. 		new Gui_Calculator();
  465. 	}
  466. }

该计算器的功能简单只能实现加、减、乘、除以及求出结果后的连续运算的简单功能

声明：本文内容由网友自发贡献，不代表【wpsshop博客】立场，版权归原作者所有，本站不承担相应法律责任。如您发现有侵权的内容，请联系我们。转载请注明出处：https://www.wpsshop.cn/w/笔触狂放9/article/detail/275759
推荐阅读
相关标签

Copyright © 2003-2013 www.wpsshop.cn 版权所有，并保留所有权利。

  

闽ICP备14008679号