第一个Java程序——计算器
第一次写的，一边写一边修改，很简单的整数计算器，拿来抛砖引玉吧
1 /* 2 *简单的计算器 3 *没有写注释，不过很简单的小程序估计也没人看吧┑(￣Д ￣)┍ 4 */ 5 6 package com.Calculator; 7 8 import javax.swing.SwingUtilities; 9 import java.awt.BorderLayout; 10 import javax.swing.JPanel; 11 import javax.swing.JFrame; 12 import java.awt.FlowLayout; 13 import java.awt.GridBagLayout; 14 import java.awt.GridLayout; 15 import java.awt.Toolkit; 16 17 import javax.swing.JButton; 18 import java.awt.Dimension; 19 import java.awt.Font; 20 import javax.swing.JTextField; 21 import java.awt.GridBagConstraints; 22 23 public class CalculatorDeom extends JFrame { 24 25 26 public String st1=""; // @jve:decl-index=0: 27 public String st2=""; // @jve:decl-index=0: 28 public int mao=0; 29 // @jve:decl-index=0: 30 31 private static final long serialVersionUID = 1L; 32 private JPanel jContentPane = null; 33 private JPanel jPanel = null; 34 private JPanel jPanel1 = null; 35 private JButton jButton = null; 36 private JTextField jTextField = null; 37 private JButton jButton1 = null; 38 private JButton jButton2 = null; 39 private JButton jButton3 = null; 40 private JButton jButton4 = null; 41 private JButton jButton5 = null; 42 private JButton jButton6 = null; 43 private JButton jButton7 = null; 44 private JButton jButton8 = null; 45 private JButton jButton9 = null; 46 private JButton jButton10 = null; 47 private JButton jButton11 = null; 48 private JButton jButton12 = null; 49 private JButton jButton13 = null; 50 private JButton jButton14 = null; 51 private JButton jButton15 = null; 52 53 /** 54 * This method initializes jPanel 55 * 56 * @return javax.swing.JPanel 57 */ 58 private JPanel getJPanel() { 59 if (jPanel == null) { 60 jPanel = new JPanel(); 61 jPanel.setLayout(new FlowLayout()); 62 jPanel.add(getJTextField(), null); 63 } 64 return jPanel; 65 } 66 67 /** 68 * This method initializes jPanel1 69 * 70 * @return javax.swing.JPanel 71 */ 72 private JPanel getJPanel1() { 73 if (jPanel1 == null) { 74 GridLayout gridLayout = new GridLayout(); 75 gridLayout.setRows(4); 76 gridLayout.setHgap(10); 77 gridLayout.setVgap(10); 78 gridLayout.setColumns(4); 79 jPanel1 = new JPanel(); 80 jPanel1.setLayout(gridLayout); 81 jPanel1.add(getJButton(), null); 82 jPanel1.add(getJButton1(), null); 83 jPanel1.add(getJButton2(), null); 84 jPanel1.add(getJButton3(), null); 85 jPanel1.add(getJButton4(), null); 86 jPanel1.add(getJButton5(), null); 87 jPanel1.add(getJButton6(), null); 88 jPanel1.add(getJButton7(), null); 89 jPanel1.add(getJButton8(), null); 90 jPanel1.add(getJButton9(), null); 91 jPanel1.add(getJButton10(), null); 92 jPanel1.add(getJButton11(), null); 93 jPanel1.add(getJButton12(), null); 94 jPanel1.add(getJButton13(), null); 95 jPanel1.add(getJButton14(), null); 96 jPanel1.add(getJButton15(), null); 97 } 98 return jPanel1; 99 } 100 101 /** 102 * This method initializes jButton 103 * 104 * @return javax.swing.JButton 105 */ 106 private JButton getJButton() { 107 if (jButton == null) { 108 jButton = new JButton(); 109 jButton.setPreferredSize(new Dimension(70, 50)); 110 jButton.setText("1"); 111 jButton.setFont(new Font("Times New Roman", Font.BOLD, 18)); 112 jButton.addActionListener(new java.awt.event.ActionListener() { 113 public void actionPerformed(java.awt.event.ActionEvent e) { 114 st1=st1+jButton.getText(); 115 jTextField.setText(st1); 116 } 117 }); 118 } 119 return jButton; 120 } 121 122 /** 123 * This method initializes jTextField 124 * 125 * @return javax.swing.JTextField 126 */ 127 private JTextField getJTextField() { 128 if (jTextField == null) { 129 jTextField = new JTextField(); 130 jTextField.setColumns(21); 131 jTextField.setEditable(false); 132 133 jTextField.setFont(new Font("Times New Roman", Font.PLAIN, 18)); 134 jTextField.setPreferredSize(new Dimension(279, 60)); 135 } 136 return jTextField; 137 } 138 139 /** 140 * This method initializes jButton1 141 * 142 * @return javax.swing.JButton 143 */ 144 private JButton getJButton1() { 145 if (jButton1 == null) { 146 jButton1 = new JButton(); 147 jButton1.setFont(new Font("Times New Roman", Font.BOLD, 18)); 148 jButton1.setText("2"); 149 jButton1.setPreferredSize(new Dimension(70, 50)); 150 jButton1.addActionListener(new java.awt.event.ActionListener() { 151 public void actionPerformed(java.awt.event.ActionEvent e) { 152 st1=st1+jButton1.getText(); 153 jTextField.setText(st1); 154 } 155 }); 156 } 157 return jButton1; 158 } 159 160 /** 161 * This method initializes jButton2 162 * 163 * @return javax.swing.JButton 164 */ 165 private JButton getJButton2() { 166 if (jButton2 == null) { 167 jButton2 = new JButton(); 168 jButton2.setFont(new Font("Times New Roman", Font.BOLD, 18)); 169 jButton2.setText("3"); 170 jButton2.setPreferredSize(new Dimension(70, 50)); 171 jButton2.addActionListener(new java.awt.event.ActionListener() { 172 public void actionPerformed(java.awt.event.ActionEvent e) { 173 st1=st1+jButton2.getText(); 174 jTextField.setText(st1); 175 } 176 }); 177 } 178 return jButton2; 179 } 180 181 /** 182 * This method initializes jButton3 183 * 184 * @return javax.swing.JButton 185 */ 186 private JButton getJButton3() { 187 if (jButton3 == null) { 188 jButton3 = new JButton(); 189 jButton3.setFont(new Font("Times New Roman", Font.BOLD, 18)); 190 jButton3.setText("÷"); 191 jButton3.setPreferredSize(new Dimension(70, 50)); 192 jButton3.addActionListener(new java.awt.event.ActionListener() { 193 public void actionPerformed(java.awt.event.ActionEvent e) { 194 st2=st1; 195 st1=""; 196 jTextField.setText(st1); 197 mao=4; 198 } 199 }); 200 } 201 return jButton3; 202 } 203 204 /** 205 * This method initializes jButton4 206 * 207 * @return javax.swing.JButton 208 */ 209 private JButton getJButton4() { 210 if (jButton4 == null) { 211 jButton4 = new JButton(); 212 jButton4.setFont(new Font("Times New Roman", Font.BOLD, 18)); 213 jButton4.setText("4"); 214 jButton4.setPreferredSize(new Dimension(70, 50)); 215 jButton4.addActionListener(new java.awt.event.ActionListener() { 216 public void actionPerformed(java.awt.event.ActionEvent e) { 217 st1=st1+jButton4.getText(); 218 jTextField.setText(st1); 219 } 220 }); 221 } 222 return jButton4; 223 } 224 225 /** 226 * This method initializes jButton5 227 * 228 * @return javax.swing.JButton 229 */ 230 private JButton getJButton5() { 231 if (jButton5 == null) { 232 jButton5 = new JButton(); 233 jButton5.setFont(new Font("Times New Roman", Font.BOLD, 18)); 234 jButton5.setText("5"); 235 jButton5.setPreferredSize(new Dimension(70, 50)); 236 jButton5.addActionListener(new java.awt.event.ActionListener() { 237 public void actionPerformed(java.awt.event.ActionEvent e) { 238 st1=st1+jButton5.getText(); 239 jTextField.setText(st1); 240 } 241 }); 242 } 243 return jButton5; 244 } 245 246 /** 247 * This method initializes jButton6 248 * 249 * @return javax.swing.JButton 250 */ 251 private JButton getJButton6() { 252 if (jButton6 == null) { 253 jButton6 = new JButton(); 254 jButton6.setFont(new Font("Times New Roman", Font.BOLD, 18)); 255 jButton6.setText("6"); 256 jButton6.setPreferredSize(new Dimension(70, 50)); 257 jButton6.addActionListener(new java.awt.event.ActionListener() { 258 public void actionPerformed(java.awt.event.ActionEvent e) { 259 st1=st1+jButton6.getText(); 260 jTextField.setText(st1); 261 } 262 }); 263 } 264 return jButton6; 265 } 266 267 /** 268 * This method initializes jButton7 269 * 270 * @return javax.swing.JButton 271 */ 272 private JButton getJButton7() { 273 if (jButton7 == null) { 274 jButton7 = new JButton(); 275 jButton7.setFont(new Font("Times New Roman", Font.BOLD, 18)); 276 jButton7.setText("×"); 277 jButton7.setPreferredSize(new Dimension(70, 50)); 278 jButton7.addActionListener(new java.awt.event.ActionListener() { 279 public void actionPerformed(java.awt.event.ActionEvent e) { 280 st2=st1; 281 st1=""; 282 jTextField.setText(st1); 283 mao=3; 284 } 285 }); 286 } 287 return jButton7; 288 } 289 290 /** 291 * This method initializes jButton8 292 * 293 * @return javax.swing.JButton 294 */ 295 private JButton getJButton8() { 296 if (jButton8 == null) { 297 jButton8 = new JButton(); 298 jButton8.setFont(new Font("Times New Roman", Font.BOLD, 18)); 299 jButton8.setText("7"); 300 jButton8.setPreferredSize(new Dimension(70, 50)); 301 jButton8.addActionListener(new java.awt.event.ActionListener() { 302 public void actionPerformed(java.awt.event.ActionEvent e) { 303 st1=st1+jButton8.getText(); 304 jTextField.setText(st1); 305 } 306 }); 307 } 308 return jButton8; 309 } 310 311 /** 312 * This method initializes jButton9 313 * 314 * @return javax.swing.JButton 315 */ 316 private JButton getJButton9() { 317 if (jButton9 == null) { 318 jButton9 = new JButton(); 319 jButton9.setFont(new Font("Times New Roman", Font.BOLD, 18)); 320 jButton9.setText("8"); 321 jButton9.setPreferredSize(new Dimension(70, 50)); 322 jButton9.addActionListener(new java.awt.event.ActionListener() { 323 public void actionPerformed(java.awt.event.ActionEvent e) { 324 st1=st1+jButton9.getText(); 325 jTextField.setText(st1); 326 } 327 }); 328 } 329 return jButton9; 330 } 331 332 /** 333 * This method initializes jButton10 334 * 335 * @return javax.swing.JButton 336 */ 337 private JButton getJButton10() { 338 if (jButton10 == null) { 339 jButton10 = new JButton(); 340 jButton10.setFont(new Font("Times New Roman", Font.BOLD, 18)); 341 jButton10.setText("9"); 342 jButton10.setPreferredSize(new Dimension(70, 50)); 343 jButton10.addActionListener(new java.awt.event.ActionListener() { 344 public void actionPerformed(java.awt.event.ActionEvent e) { 345 st1=st1+jButton10.getText(); 346 jTextField.setText(st1); 347 } 348 }); 349 } 350 return jButton10; 351 } 352 353 /** 354 * This method initializes jButton11 355 * 356 * @return javax.swing.JButton 357 */ 358 private JButton getJButton11() { 359 if (jButton11 == null) { 360 jButton11 = new JButton(); 361 jButton11.setFont(new Font("Times New Roman", Font.BOLD, 18)); 362 jButton11.setText("+"); 363 jButton11.setPreferredSize(new Dimension(70, 50)); 364 jButton11.addActionListener(new java.awt.event.ActionListener() { 365 public void actionPerformed(java.awt.event.ActionEvent e) { 366 st2=st1; 367 st1=""; 368 jTextField.setText(st1); 369 mao=1; 370 } 371 }); 372 } 373 return jButton11; 374 } 375 376 /** 377 * This method initializes jButton12 378 * 379 * @return javax.swing.JButton 380 */ 381 private JButton getJButton12() { 382 if (jButton12 == null) { 383 jButton12 = new JButton(); 384 jButton12.setFont(new Font("Times New Roman", Font.BOLD, 18)); 385 jButton12.setText("0"); 386 jButton12.setPreferredSize(new Dimension(70, 50)); 387 jButton12.addActionListener(new java.awt.event.ActionListener() { 388 public void actionPerformed(java.awt.event.ActionEvent e) { 389 st1=st1+jButton12.getText(); 390 jTextField.setText(st1); 391 } 392 }); 393 } 394 return jButton12; 395 } 396 397 /** 398 * This method initializes jButton13 399 * 400 * @return javax.swing.JButton 401 */ 402 private JButton getJButton13() { 403 if (jButton13 == null) { 404 jButton13 = new JButton(); 405 jButton13.setFont(new Font("Times New Roman", Font.BOLD, 18)); 406 jButton13.setText("C"); 407 jButton13.setPreferredSize(new Dimension(70, 50)); 408 jButton13.addActionListener(new java.awt.event.ActionListener() { 409 public void actionPerformed(java.awt.event.ActionEvent e) { 410 st1=""; 411 st2=""; 412 mao=0; 413 jTextField.setText(st1); 414 } 415 416 }); 417 } 418 return jButton13; 419 } 420 421 /** 422 * This method initializes jButton14 423 * 424 * @return javax.swing.JButton 425 */ 426 private JButton getJButton14() { 427 if (jButton14 == null) { 428 jButton14 = new JButton(); 429 jButton14.setFont(new Font("Times New Roman", Font.BOLD, 18)); 430 jButton14.setText("="); 431 jButton14.setPreferredSize(new Dimension(70, 50)); 432 jButton14.addActionListener(new java.awt.event.ActionListener() { 433 public void actionPerformed(java.awt.event.ActionEvent e) { 434 if (mao==1) { 435 int i=(Integer.valueOf(st2).intValue())+(Integer.valueOf(st1).intValue()); 436 st2=String.valueOf(i); 437 jTextField.setText(st2); 438 st1=""; 439 mao=0; 440 }if (mao==2) { 441 int i=(Integer.valueOf(st2).intValue())-(Integer.valueOf(st1).intValue()); 442 st2=String.valueOf(i); 443 jTextField.setText(st2); 444 st1=""; 445 mao=0; 446 }if (mao==3) { 447 int i=(Integer.valueOf(st2).intValue())*(Integer.valueOf(st1).intValue()); 448 st2=String.valueOf(i); 449 jTextField.setText(st2); 450 st1=""; 451 mao=0; 452 }if (mao==4) { 453 try { 454 int i=(Integer.valueOf(st2).intValue())/(Integer.valueOf(st1).intValue()); 455 st2=String.valueOf(i); 456 jTextField.setText(st2); 457 st1=""; 458 mao=0; 459 } catch (Exception e2) { 460 // TODO: handle exception 461 jTextField.setText("By/Zore"); 462 } 463 } 464 } 465 }); 466 } 467 return jButton14; 468 } 469 470 /** 471 * This method initializes jButton15 472 * 473 * @return javax.swing.JButton 474 */ 475 private JButton getJButton15() { 476 if (jButton15 == null) { 477 jButton15 = new JButton(); 478 jButton15.setFont(new Font("Times New Roman", Font.BOLD, 18)); 479 jButton15.setText("-"); 480 jButton15.setPreferredSize(new Dimension(70, 50)); 481 jButton15.addActionListener(new java.awt.event.ActionListener() { 482 public void actionPerformed(java.awt.event.ActionEvent e) { 483 st2=st1; 484 st1=""; 485 jTextField.setText(st1); 486 mao=2; 487 } 488 }); 489 } 490 return jButton15; 491 } 492 493 /** 494 * @param args 495 */ 496 public static void main(String[] args) { 497 // TODO Auto-generated method stub 498 SwingUtilities.invokeLater(new Runnable() { 499 public void run() { 500 CalculatorDeom thisClass = new CalculatorDeom(); 501 thisClass.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 502 thisClass.setVisible(true); 503 } 504 }); 505 } 506 507 /** 508 * This is the default constructor 509 */ 510 public CalculatorDeom() { 511 super(); 512 initialize(); 513 } 514 515 /** 516 * This method initializes this 517 * 518 * @return void 519 */ 520 private void initialize() { 521 this.setSize(336, 351); 522 Toolkit tk = Toolkit.getDefaultToolkit(); 523 Dimension ds = tk.getScreenSize(); 524 int x = (int)(ds.getWidth()-336)/2; 525 int y = (int)(ds.getHeight()-351)/2; 526 this.setLocation(x, y); 527 this.setResizable(false); 528 this.setContentPane(getJContentPane()); 529 this.setTitle("JFrame"); 530 this.setVisible(true); 531 } 532 533 /** 534 * This method initializes jContentPane 535 * 536 * @return javax.swing.JPanel 537 */ 538 private JPanel getJContentPane() { 539 if (jContentPane == null) { 540 jContentPane = new JPanel(); 541 jContentPane.setLayout(new FlowLayout()); 542 jContentPane.add(getJPanel(), null); 543 jContentPane.add(getJPanel1(), null); 544 } 545 return jContentPane; 546 } 547 548 } // @jve:decl-index=0:visual-constraint="10,10"
一个多小时的时间，难免有很多错误，等完成作业了在尝试着改进下吧~~