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トップに関する質問コードをどう直せばいいか教えて下さい。

編集履歴

質問編集履歴

4

2020/04/19 10:55

投稿

TTTTkuma
TTTTkuma

スコア7

test CHANGED
File without changes
test CHANGED
@@ -2,6 +2,22 @@
2
2
 
3
3
  どう改善すればよろしいでしょうか？助言くださると助かります。
4
4
 
5
+ テキストファイル内の文書は
6
+
7
+
8
+
9
+ Sam 001 1999/01/07
10
+
11
+ Jennifer 002 1998/04/05
12
+
13
+ Bob 003 1999/03/14
14
+
15
+ Jonathan 004 1998/09/07
16
+
17
+ となります。
18
+
19
+
20
+
5
21
  ```java
6
22
 
7
23
 

3

2020/04/19 10:55

投稿

TTTTkuma
TTTTkuma

スコア7

test CHANGED
@@ -1 +1 @@
1
- コンパイルエラーの原因とコードをどう修正すれば良いのか教えて下さい。
1
+ コードをどう直せばいいか教えて下さい。
test CHANGED
File without changes

2

2020/04/19 10:50

投稿

TTTTkuma
TTTTkuma

スコア7

test CHANGED
File without changes
test CHANGED
@@ -1,19 +1,17 @@
1
- javaで以下のコードをコンパイルしようとするとコンパイルエラーが起き、Exception in thread "main" java.io.FileNotFoundException: D:\java\member.txtとでます。
1
+ StudentTestクラスにてテキストファイルstudent.txtをからデータを読み込み、テキストファイルの各行をStudentオブジェクトに変換してバイナリファイルstudent.datに書き込み、そのStudentに書き込まれたデータが正しいか確認したいのですが上手くいきません。
2
-
2
+
3
- 何故こうなるのでしょうか？
3
+ どう改善すればよろしいでしょうか？助言くださると助かります。
4
4
 
5
5
  ```java
6
6
 
7
7
 
8
8
 
9
- package filetest;
9
+ package studenttest;
10
10
 
11
11
  import java.io.BufferedReader;
12
12
 
13
13
  import java.io.BufferedWriter;
14
14
 
15
- import java.io.DataInputStream;
16
-
17
15
  import java.io.File;
18
16
 
19
17
  import java.io.FileInputStream;
@@ -38,7 +36,7 @@
38
36
 
39
37
  import java.util.logging.Logger;
40
38
 
41
- public class FileTest {
39
+ public class StudentTest {
42
40
 
43
41
 
44
42
 
@@ -68,7 +66,9 @@
68
66
 
69
67
 
70
68
 
71
-
69
+ readStudents("D:\students.txt","big5");
70
+
71
+
72
72
 
73
73
  }
74
74
 
@@ -84,8 +84,6 @@
84
84
 
85
85
  input = new ObjectInputStream(new FileInputStream(filename));
86
86
 
87
-
88
-
89
87
  while (true) {
90
88
 
91
89
  Object o = input.readObject();
@@ -102,9 +100,7 @@
102
100
 
103
101
  input.close();
104
102
 
105
- } catch (Exception e) {
103
+ } catch (IOException | ClassNotFoundException e) {
106
-
107
-
108
104
 
109
105
  input.close();
110
106
 
@@ -114,21 +110,19 @@
114
110
 
115
111
  private static void writeObjectStream(String filename) throws FileNotFoundException, IOException {
116
112
 
117
-
118
-
119
- ObjectOutputStream output = new ObjectOutputStream(new FileOutputStream(filename));
113
+ try (ObjectOutputStream output = new ObjectOutputStream(new FileOutputStream(filename))) {
120
-
114
+
121
- output.writeObject(new Date(1992, 3, 23));
115
+ output.writeObject(new Date(1992, 3, 23));
122
-
116
+
123
- output.writeObject(new Date(1997, 5, 3));
117
+ output.writeObject(new Date(1997, 5, 3));
124
-
118
+
125
- output.writeObject(new Date(2010, 7, 16));
119
+ output.writeObject(new Date(2010, 7, 16));
126
-
120
+
127
- output.writeObject("hello");
121
+ output.writeObject("hello");
128
-
122
+
129
- output.writeObject(new Member("John", new Date(1997, 5, 3)));
123
+ output.writeObject(new Student("John","213" , new Date(1997, 5, 3)));
130
-
124
+
131
- output.close();
125
+ }
132
126
 
133
127
  }
134
128
 
@@ -140,19 +134,17 @@
140
134
 
141
135
  OutputStreamWriter writer = new OutputStreamWriter(stream, encoding);
142
136
 
143
- BufferedWriter output = new BufferedWriter(writer);
137
+ try (BufferedWriter output = new BufferedWriter(writer)) {
144
-
145
-
146
-
138
+
147
- output.write("Abc");
139
+ output.write("Abc");
148
-
140
+
149
- output.write("物件導向");
141
+ output.write("オブジェクト指向");
150
-
142
+
151
- output.close();
143
+ }
152
144
 
153
145
  } catch (IOException ex) {
154
146
 
155
- Logger.getLogger(FileTest.class.getName()).log(Level.SEVERE, null, ex);
147
+ Logger.getLogger(StudentTest.class.getName()).log(Level.SEVERE, null, ex);
156
148
 
157
149
  }
158
150
 
@@ -160,37 +152,51 @@
160
152
 
161
153
  private static void readMembers(String filename, String encoding) throws FileNotFoundException, IOException {
162
154
 
163
- BufferedReader input = new BufferedReader(new InputStreamReader(new FileInputStream(filename), encoding));
155
+ try (BufferedReader input = new BufferedReader(new InputStreamReader(new FileInputStream(filename), encoding))) {
164
-
156
+
165
- Member members[] = new Member[3];
157
+ Student students[] = new Student[3];
166
-
158
+
167
- int index = 0;
159
+ int index = 0;
168
-
160
+
169
- while (true) {
161
+ while (true) {
170
-
162
+
171
- String line = input.readLine();
163
+ String line = input.readLine();
172
-
164
+
173
- if (line == null) {
165
+ if (line == null) {
174
-
166
+
175
- break;
167
+ break;
176
-
168
+
177
- }
169
+ }
170
+
171
+
172
+
178
-
173
+ String tokens[] = line.split(",");
174
+
175
+
176
+
179
-
177
+ String name = tokens[0], id = tokens[1], birthday = tokens[2];
178
+
180
-
179
+ String births[] = birthday.split("/");
180
+
181
+
182
+
183
+ int yy = Integer.parseInt(births[0]), mm=Integer.parseInt(births[1]),dd=Integer.parseInt(births[2]);
184
+
185
+
186
+
181
- members[index] = new Member(name, new Date(yy, mm, dd));
187
+ students[index] = new Student(name, id, new Date(yy, mm, dd));
182
-
188
+
183
- index++;
189
+ index++;
184
-
185
-
186
-
190
+
191
+
192
+
187
- }
193
+ }
188
-
194
+
189
- System.out.println("--------------");
195
+ System.out.println("--------------");
190
-
196
+
191
- for(Member member : members) System.out.println(member);
197
+ for(Student member : students) System.out.println(member);
192
-
198
+
193
- input.close();
199
+ }
194
200
 
195
201
  }
196
202
 
@@ -202,55 +208,55 @@
202
208
 
203
209
  InputStreamReader reader = new InputStreamReader(stream, encoding);
204
210
 
205
- BufferedReader input = new BufferedReader(reader);
211
+ try (BufferedReader input = new BufferedReader(reader)) {
206
-
207
- BufferedReader(new InputStreamReader(new FileInputStream(filename), encoding));
212
+
208
-
209
- while (true) {
213
+ while (true) {
210
-
214
+
211
- String line = input.readLine();
215
+ String line = input.readLine();
212
-
216
+
213
- if (line == null) {
217
+ if (line == null) {
214
-
218
+
215
- break;
219
+ break;
216
-
220
+
217
- }
221
+ }
218
-
222
+
219
- System.out.println(line);
223
+ System.out.println(line);
220
-
224
+
221
- }
225
+ }
222
-
226
+
223
- input.close();
227
+ }
224
228
 
225
229
  }
226
230
 
227
231
  private static void readByReaderDefaultEncoding(String filename) throws FileNotFoundException, IOException {
228
232
 
229
- FileReader reader = new FileReader(filename);
233
+ try (FileReader reader = new FileReader(filename)) {
230
-
234
+
231
- while (reader.ready()) {
235
+ while (reader.ready()) {
232
-
233
-
234
-
236
+
237
+
238
+
235
- char[] chIn = new char[10];
239
+ char[] chIn = new char[10];
236
-
237
-
238
-
240
+
241
+
242
+
239
- int nResult = reader.read(chIn);
243
+ int nResult = reader.read(chIn);
240
-
244
+
241
- if (nResult == -1) {
245
+ if (nResult == -1) {
242
-
246
+
243
- break;
247
+ break;
244
-
248
+
245
- }
249
+ }
246
-
247
-
248
-
250
+
251
+
252
+
253
+
254
+
249
- System.out.println(chIn);
255
+ System.out.println(chIn);
250
-
256
+
251
- }
257
+ }
252
-
258
+
253
- reader.close();
259
+ }
254
260
 
255
261
  }
256
262
 
@@ -260,41 +266,53 @@
260
266
 
261
267
  System.out.println("main started");
262
268
 
263
- FileInputStream fis = new FileInputStream(filename);
269
+ try (FileInputStream fis = new FileInputStream(filename)) {
264
-
270
+
265
- System.out.println("input is " + fis);
271
+ System.out.println("input is " + fis);
266
-
272
+
267
- while (fis.available() > 0) {
273
+ while (fis.available() > 0) {
268
-
274
+
275
+
276
+
269
- byte[] b = new byte[1];
277
+ byte[] b = new byte[1];
270
-
278
+
279
+
280
+
271
- int nResult = fis.read(b);
281
+ int nResult = fis.read(b);
272
-
282
+
273
- if (nResult == -1) {
283
+ if (nResult == -1) {
274
-
284
+
275
- break;
285
+ break;
276
-
286
+
277
- }
287
+ }
278
-
279
-
280
-
288
+
289
+
290
+
281
- System.out.print(new String(b));
291
+ System.out.print(new String(b));
282
-
292
+
283
- }
293
+ }
284
-
294
+
285
- fis.close();
295
+ }
286
296
 
287
297
  } catch (FileNotFoundException ex) {
288
298
 
289
- Logger.getLogger(FileTest.class.getName()).log(Level.SEVERE, null, ex);
299
+ Logger.getLogger(StudentTest.class.getName()).log(Level.SEVERE, null, ex);
290
300
 
291
301
  } catch (IOException ex) {
292
302
 
293
- Logger.getLogger(FileTest.class.getName()).log(Level.SEVERE, null, ex);
303
+ Logger.getLogger(StudentTest.class.getName()).log(Level.SEVERE, null, ex);
294
-
304
+
295
- }
305
+ }
296
-
306
+
297
- }
307
+ }
308
+
309
+ private static void readStudents(String dstudentstxt, String big5) {
310
+
311
+ throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
312
+
313
+ }
314
+
315
+ }
298
316
 
299
317
 
300
318
 
@@ -304,7 +322,47 @@
304
322
 
305
323
 
306
324
 
307
- package filetest;
325
+ package studenttest;
326
+
327
+ public class Student {
328
+
329
+ String name;
330
+
331
+ String id;
332
+
333
+ Date birthday;
334
+
335
+ public Student(String n,String i, Date d) {
336
+
337
+ name = n;
338
+
339
+ id = i;
340
+
341
+ birthday = d;
342
+
343
+
344
+
345
+ }
346
+
347
+ @Override
348
+
349
+ public String toString() {
350
+
351
+ return name + ": " + id +": " + birthday;
352
+
353
+ }
354
+
355
+ }
356
+
357
+
358
+
359
+ ```
360
+
361
+ ```java
362
+
363
+
364
+
365
+ package studenttest;
308
366
 
309
367
  import java.io.Serializable;
310
368
 
@@ -333,37 +391,3 @@
333
391
 
334
392
 
335
393
  ```
336
-
337
- ```java
338
-
339
-
340
-
341
- package filetest;
342
-
343
- import java.io.Serializable;
344
-
345
- public class Member implements Serializable {
346
-
347
- String name;
348
-
349
- Date birthday;
350
-
351
- public Member(String n, Date d) {
352
-
353
- name = n;
354
-
355
- birthday = d;
356
-
357
- }
358
-
359
- public String toString() {
360
-
361
- return name + ": " + birthday;
362
-
363
- }
364
-
365
- }
366
-
367
-
368
-
369
- ```

1

2020/04/19 10:50

投稿

TTTTkuma
TTTTkuma

スコア7

test CHANGED
File without changes
test CHANGED
@@ -234,7 +234,7 @@
234
234
 
235
235
  char[] chIn = new char[10];
236
236
 
237
- chIn 中，若已達檔案底端則回傳-1
237
+
238
238
 
239
239
  int nResult = reader.read(chIn);
240
240