1  //设一个班有n名学生,期末考试5门,编写程序评定学生奖学金

  2 514 //要求打印输出一二等奖学金学生的学号,姓名和各科成绩

  3 515 //总成绩超过全班总平均成绩20%一等奖学金,超过总平均成绩10%发二等奖学金

  4 516 package calsswork3;

  5 517

  6 518 import java.util.Scanner;

  7 519

  8 520 public class student {

  9 521      private String name;

 10 522      private int id;

 11 523      private int java;

 12 524      private int c;

 13 525      private int datastruct;

 14 526      private int math;

 15 527      private int english;

 16 528   public String getName() {

 17 529     return name;

 18 530   }

 19 531   public void setName(String name) {

 20 532     this.name = name;

 21 533   }

 22 534   public int getJava() {

 23 535     return java;

 24 536   }

 25 537   public void setJava(int java) {

 26 538     this.java = java;

 27 539   }

 28 540   public int getId() {

 29 541     return id;

 30 542   }

 31 543   public void setId(int id) {

 32 544     this.id = id;

 33 545   }

 34 546   public int getC() {

 35 547     return c;

 36 548   }

 37 549   public void setC(int c) {

 38 550     this.c = c;

 39 551   }

 40 552   public int getDatastruct() {

 41 553     return datastruct;

 42 554   }

 43 555   public void setDatastruct(int datastruct) {

 44 556     this.datastruct = datastruct;

 45 557   }

 46 558   public int getMath() {

 47 559     return math;

 48 560   }

 49 561   public void setMath(int math) {

 50 562     this.math = math;

 51 563   }

 52 564   public int getEnglish() {

 53 565     return english;

 54 566   }

 55 567   public void setEnglish(int english) {

 56 568     this.english = english;

 57 569   }

 58 570   public void set(String name, int id, int java, int c, int datastruct, int math, int english) {

 59 571     this.name = name;

 60 572     this.id = id;

 61 573     this.java = java;

 62 574     this.c = c;

 63 575     this.datastruct = datastruct;

 64 576     this.math = math;

 65 577     this.english = english;

 66 578   }

 67 579

 68 580   public student() {

 69 581     Scanner in =new Scanner(System.in);

 70 582     String name=in.next();

 71 583     int id=in.nextInt();

 72 584     int java=in.nextInt();

 73 585     int c=in.nextInt();

 74 586     int datastruct=in.nextInt();

 75 587     int math=in.nextInt();

 76 588     int english=in.nextInt();

 77 589     set(name, id, java, c, datastruct, math, english);

 78 590   }

 79 591

 80 592

 81 593 }

 82 594 package calsswork3;

 83 595

 84 596 import java.util.Scanner;

 85 597

 86 598 public class studentmanage {

 87 599     private int n;

 88 600   private student[] ss;

 89 601   private int []sumsocre;

 90 602   public studentmanage() {

 91 603     System.out.println("请输入班级人数N");

 92 604     Scanner in=new Scanner(System.in);

 93 605     int n=in.nextInt();

 94 606     this.ss=new student[n];

 95 607     this.sumsocre=new int[n];

 96 608   }

 97 609   public void init() {

 98 610     for(int i=0;i<ss.length;++i) {

 99 611       System.out.println("请输入第"+(i+1)+"个学生的信息(依次输入姓名,学号和java,c语言,数据结构,数学,英语成绩)");

100 612       ss[i]=new student();

101 613       }

102 614

103 615   }

104 616   private int sum() {

105 617     int total=0;

106 618        for(int i=0;i<sumsocre.length;++i) {

107 619          sumsocre[i]=ss[i].getC()+ss[i].getDatastruct()+ss[i].getMath()+ss[i].getEnglish();

108 620            total+=sumsocre[i];

109 621        }

110 622        return total;

111 623   }

112 624   private double avg() {

113 625     int total=sum();

114 626     double avgscore=total*1.0/ss.length;

115 627     return avgscore;

116 628   }

117 629   public void jiangxuejin() {

118 630     double a=avg();

119 631     double b=a*1.2;

120 632     double c=a*1.1;

121 633     System.out.println("获得一等奖学金的同学为:");

122 634     System.out.println("名字\t学号\t\tjava\t\tc\t\t数据结构\t\t离散数学\t\t英语");

123 635     for(int i=0;i<sumsocre.length;++i) {

124 636       if(sumsocre[i]>=b) {

125 637         System.out.println(ss[i].getName()+"\t"+ss[i].getId()+"\t\t"+ss[i].getJava()+"\t\t"+ss[i].getC()+"\t\t"+ss[i].getDatastruct()+"\t\t"+ss[i].getMath()+"\t\t"+ss[i].getEnglish());

126 638       }

127 639

128 640     }

129 641     System.out.println("获得二等奖学金的同学为:");

130 642     System.out.println("名字\t学号\t\tjava\t\tc\t\t数据结构\t\t离散数学\t\t英语");

131 643     for(int i=0;i<sumsocre.length;++i) {

132 644       if(sumsocre[i]>=c&&sumsocre[i]<b) {

133 645         System.out.println(ss[i].getName()+"\t"+ss[i].getId()+"\t\t"+ss[i].getJava()+"\t\t"+ss[i].getC()+"\t\t"+ss[i].getDatastruct()+"\t\t"+ss[i].getMath()+"\t\t"+ss[i].getEnglish());

134 646       }

135 647     }

136 648   }

137 649   public void showss() {

138 650     System.out.println("名字\t学号\t\tjava\t\tc\t\t数据结构\t\t离散数学\t\t英语");

139 651     for(int i=0;i<ss.length;++i) {

140 652

141 653       System.out.println(ss[i].getName()+"\t"+ss[i].getId()+"\t\t"+ss[i].getJava()+"\t\t"+ss[i].getC()+"\t\t"+ss[i].getDatastruct()+"\t\t"+ss[i].getMath()+"\t\t"+ss[i].getEnglish());

142 654     }

143 655   }

144 656 }

145 657 package calsswork3;

146 658

147 659 public class studenttest {

148 660

149 661   public static void main(String[] args) {

150 662     studentmanage manager=new studentmanage();

151 663     manager.init();

152 664     System.out.println("全部学生信息:");

153 665     manager.showss();

154 666         manager.jiangxuejin();

155 667   }

156 668

157 669 }

158 670 //学生信息管理系统

159 671 package classwork_5;

160 672

161 673 public class student {

162 674        private String name;//名字

163 675        private int id;//学号

164 676        private String state;//是否在籍

165 677        private double gpa;//在校绩点成绩

166 678   public student() {

167 679

168 680   }

169 681   public student(String name, int id, String state, double gpa) {

170 682     this.name = name;

171 683     this.id = id;

172 684     this.state = state;

173 685     this.gpa = gpa;

174 686   }

175 687   public String getName() {

176 688     return name;

177 689   }

178 690   public void setName(String name) {

179 691     this.name = name;

180 692   }

181 693   public int getId() {

182 694     return id;

183 695   }

184 696   public void setId(int id) {

185 697     this.id = id;

186 698   }

187 699   public String getState() {

188 700     return state;

189 701   }

190 702   public void setState(String state) {

191 703     this.state = state;

192 704   }

193 705   public double getGpa() {

194 706     return gpa;

195 707   }

196 708   public void setGpa(double d) {

197 709     this.gpa = d;

198 710   }

199 711

200 712 }

201 713 package classwork_5;

202 714

203 715 import java.util.Scanner;

204 716

205 717 public class stumanager {

206 718   private student[] stu;

207 719   private Scanner in = new Scanner(System.in);

208 720

209 721   // 初始化,先往学生管理系统里面存入一些学生信息

210 722   public void init() {

211 723     stu = new student[20];

212 724     student stu0 = new student();

213 725     stu0.setName("张三");

214 726     stu0.setId(110120130);

215 727     stu0.setState("在籍");

216 728     stu0.setGpa(4.5);

217 729     stu[0] = stu0;

218 730   }

219 731

220 732   public void menu() {

221 733     System.out.println("*******欢迎使用学生管理系统*******");

222 734     System.out.println("请根据提示选择");

223 735     System.out.println("1.添加学生信息");

224 736     System.out.println("2.删除学生信息");

225 737     System.out.println("3.修改学生信息");

226 738     System.out.println("4.查询学生并输出");

227 739     System.out.println("5.所有学生信息");

228 740

229 741     int choice = in.nextInt();

230 742     switch (choice) {

231 743     case 1:

232 744       addstu();

233 745       break;

234 746     case 2:

235 747       delstu();

236 748       break;

237 749     case 3:

238 750       amendstu();

239 751       break;

240 752     case 4:

241 753       findstu();

242 754       break;

243 755     case 5:

244 756       show();

245 757       break;

246 758     default:

247 759     }

248 760   }

249 761

250 762   public void iscontinuemenu() {

251 763     System.out.println("是否返回到主菜单(y/n)");

252 764     String iscon = in.next();

253 765     if ("y".equals(iscon)) {

254 766       menu();

255 767     }

256 768   }

257 769

258 770   private void addstu() {

259 771     System.out.println("增加学生信息");

260 772     student st = new student();

261 773     System.out.println("请输入学生名");

262 774     String name = in.next();

263 775     System.out.println("请输入学生学号");

264 776     int id = in.nextInt();

265 777     System.out.println("请输入学生的入学年份");

266 778     int year = in.nextInt();

267 779     String y = "";

268 780     if (year <= 2020&&year>=2017) {

269 781       y = "在籍";

270 782     } else {

271 783       y = "不在籍";

272 784     }

273 785     System.out.println("请输入学生绩点");

274 786     double gpa = in.nextDouble();

275 787     st.setName(name);

276 788     st.setId(id);

277 789     st.setState(y);

278 790     st.setGpa(gpa);

279 791     // 寻找增加的位置,第一个为null的位置

280 792     int pos = -1;

281 793     for (int i = 0; i < stu.length; ++i) {

282 794       if (stu[i] == null) {

283 795         pos = i;

284 796         break;

285 797       }

286 798     }

287 799     stu[pos] = st;

288 800     iscontinuemenu();

289 801   }

290 802     //删除学生信息,根据名字删除

291 803   private void delstu() {

292 804     System.out.println("请输入要删除的名字");

293 805     String name=in.next();

294 806     //定位要删除的书的位置

295 807     int pos=-1;

296 808     for(int i=0;i<stu.length;++i) {

297 809       if(stu[i].getName().equals(name)) {

298 810         pos=i;

299 811         break;

300 812       }

301 813     }

302 814

303 815     //寻找空位置

304 816     int start=pos+1;

305 817     int firstnullpos=-1;

306 818     for(int i=0;i<stu.length;++i) {

307 819       if(stu[i]==null) {

308 820         firstnullpos=i;

309 821         break;

310 822       }

311 823     }

312 824     int end=firstnullpos-1;

313 825     if(firstnullpos==-1) {//信息系统已满,不存在为null的元素

314 826       end=stu.length-1;

315 827     }

316 828     //移动

317 829     for(int i=start;i<=end;++i) {

318 830       stu[i-1]=stu[i];

319 831

320 832     }

321 833     stu[end]=null;

322 834     iscontinuemenu();

323 835   }

324 836   //修改学生信息amend

325 837   private void amendstu() {

326 838     System.out.println("请输入要修改学生的名字");

327 839     String name=in.next();

328 840     int pos=-1,i;

329 841     for( i=0;i<stu.length;++i) {

330 842       if(stu[i].getName().equals(name)) {

331 843         pos=i;

332 844         break;

333 845       }

334 846     }

335 847     System.out.println("请输入新名字,学号,绩点");

336 848     String name1=in.next();

337 849     int id=in.nextInt();

338 850     double gpa=in.nextDouble();

339 851     stu[i].setName(name1);

340 852     stu[i].setId(id);

341 853     stu[i].setGpa(gpa);

342 854     System.out.println("已修改完毕请返回主菜单查看");

343 855     iscontinuemenu();

344 856   }

345 857   //查询学生信息,根据学号查询

346 858   private void findstu() {

347 859     System.out.println("请输入要查询学生的学号");

348 860     int id=in.nextInt();

349 861     int pos=-1,i;

350 862     for( i=0;i<stu.length;++i) {

351 863       if(stu[i].getId()==id) {

352 864         pos=i;

353 865         break;

354 866       }

355 867     }

356 868     if(pos==-1) {

357 869       System.out.println("学号输入有误,暂无此人");

358 870     }

359 871     else {

360 872       System.out.println(stu[i].getName() + "\t\t" + stu[i].getId() + "\t\t" + stu[i].getState() + "\t\t" + stu[i].getGpa());

361 873     }

362 874     iscontinuemenu();

363 875   }

364 876   // 查看所有学生信息

365 877   private void show() {

366 878     System.out.println("姓名\t\t学号\t\t\t在籍状态\t\t在校成绩");

367 879

368 880     for (student x : stu) {

369 881       if (x != null) {

370 882         System.out.println(x.getName() + "\t\t" + x.getId() + "\t\t" + x.getState() + "\t\t" + x.getGpa());

371 883       }

372 884     }

373 885     iscontinuemenu();

374 886   }

375 887

376 888 }

377 889 package classwork_5;

378 890

379 891 public class stuman_test {

380 892

381 893   public static void main(String[] args) {

382 894      stumanager a=new stumanager();

383 895      a.init();

384 896      a.menu();

385 897   }

386 898

387 899 }