回答編集履歴
4
Point5を追加
test
CHANGED
|
@@ -316,4 +316,22 @@
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316
316
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317
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}
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318
318
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319
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+
class Point5 {
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320
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+
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321
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+
String x="aaa";
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322
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323
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double y = 2;
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324
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325
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public Point5(String x,double y)
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326
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327
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{
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328
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329
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this.x = x;
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330
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331
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this.y = y;
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332
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333
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}
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334
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+
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335
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}
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336
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+
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319
337
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```
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3
回答を追加
test
CHANGED
|
File without changes
|
2
回答を追加
test
CHANGED
|
@@ -93,3 +93,227 @@
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93
93
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}
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94
94
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95
95
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```
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96
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+
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97
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+
---
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98
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99
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+
2017/12/31追記
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100
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+
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101
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+
質問文のコメント欄の内容を受けて回答を追加。
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102
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+
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103
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+
引数の判定部分は分かりやすいようにif文にしてますが、Mapで判定するのがベターです。
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104
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+
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105
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+
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106
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107
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+
```Java
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108
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+
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109
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+
import java.lang.reflect.Constructor;
|
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110
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+
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111
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+
import java.lang.reflect.Field;
|
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112
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+
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113
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+
import java.lang.reflect.InvocationTargetException;
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114
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+
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115
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+
import java.util.ArrayList;
|
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116
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+
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117
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+
import java.util.List;
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118
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+
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119
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+
import java.util.Scanner;
|
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120
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+
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121
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+
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122
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+
|
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123
|
+
public class Q107070 {
|
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124
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+
|
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125
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+
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126
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+
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127
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+
public static void main(String[] args) throws InstantiationException, IllegalAccessException,
|
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128
|
+
|
|
129
|
+
IllegalArgumentException, InvocationTargetException, NoSuchMethodException, SecurityException {
|
|
130
|
+
|
|
131
|
+
try {
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132
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+
|
|
133
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+
Class<?> c = inputFindClass();
|
|
134
|
+
|
|
135
|
+
Constructor<?>[] ctors = c.getDeclaredConstructors();
|
|
136
|
+
|
|
137
|
+
Constructor<?> ctor = ctors[0];
|
|
138
|
+
|
|
139
|
+
List<Object> params= getParams(ctor.getParameterTypes());
|
|
140
|
+
|
|
141
|
+
// コンストラクタを呼び出してインスタンスを生成
|
|
142
|
+
|
|
143
|
+
Object obj = ctor.newInstance(params.toArray());
|
|
144
|
+
|
|
145
|
+
for (Field fieled : c.getDeclaredFields()) {
|
|
146
|
+
|
|
147
|
+
fieled.setAccessible(true);
|
|
148
|
+
|
|
149
|
+
String fieldName = fieled.getName();
|
|
150
|
+
|
|
151
|
+
Class<?> fieldType = fieled.getType();
|
|
152
|
+
|
|
153
|
+
String fieldTypeStr = fieldType.getName();
|
|
154
|
+
|
|
155
|
+
System.out.print("Type : " + fieldTypeStr + ", Name : " + fieldName + ", Value : ");
|
|
156
|
+
|
|
157
|
+
try {
|
|
158
|
+
|
|
159
|
+
Object value = fieled.get(obj);
|
|
160
|
+
|
|
161
|
+
System.out.println(value);
|
|
162
|
+
|
|
163
|
+
} catch (IllegalArgumentException | IllegalAccessException e) {
|
|
164
|
+
|
|
165
|
+
System.err.println(e);
|
|
166
|
+
|
|
167
|
+
}
|
|
168
|
+
|
|
169
|
+
}
|
|
170
|
+
|
|
171
|
+
} catch (ClassNotFoundException e) {
|
|
172
|
+
|
|
173
|
+
System.err.println("クラスが見つかりません．");
|
|
174
|
+
|
|
175
|
+
System.err.println(e);
|
|
176
|
+
|
|
177
|
+
}
|
|
178
|
+
|
|
179
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+
}
|
|
180
|
+
|
|
181
|
+
|
|
182
|
+
|
|
183
|
+
public static Class<?> inputFindClass() throws ClassNotFoundException {
|
|
184
|
+
|
|
185
|
+
System.out.println("フィールドとフィールドの値を表示します．");
|
|
186
|
+
|
|
187
|
+
System.out.println("検査するクラスを入力してください");
|
|
188
|
+
|
|
189
|
+
System.out.print(">");
|
|
190
|
+
|
|
191
|
+
try (Scanner sc = new Scanner(System.in)) {
|
|
192
|
+
|
|
193
|
+
String className = sc.nextLine();
|
|
194
|
+
|
|
195
|
+
return Class.forName(className);
|
|
196
|
+
|
|
197
|
+
}
|
|
198
|
+
|
|
199
|
+
}
|
|
200
|
+
|
|
201
|
+
|
|
202
|
+
|
|
203
|
+
public static List<Object> getParams(Class<?> parameterTypes[]) throws InstantiationException,IllegalAccessException {
|
|
204
|
+
|
|
205
|
+
List<Object>params = new ArrayList<>();
|
|
206
|
+
|
|
207
|
+
for(Class<?> p:parameterTypes){
|
|
208
|
+
|
|
209
|
+
if (p.isPrimitive()){
|
|
210
|
+
|
|
211
|
+
if (p.equals(boolean.class)) {
|
|
212
|
+
|
|
213
|
+
params.add(false);
|
|
214
|
+
|
|
215
|
+
continue;
|
|
216
|
+
|
|
217
|
+
}
|
|
218
|
+
|
|
219
|
+
if (p.equals(byte.class)) {
|
|
220
|
+
|
|
221
|
+
params.add(0);
|
|
222
|
+
|
|
223
|
+
continue;
|
|
224
|
+
|
|
225
|
+
}
|
|
226
|
+
|
|
227
|
+
if (p.equals(short.class)) {
|
|
228
|
+
|
|
229
|
+
params.add(0);
|
|
230
|
+
|
|
231
|
+
continue;
|
|
232
|
+
|
|
233
|
+
}
|
|
234
|
+
|
|
235
|
+
if (p.equals(int.class)) {
|
|
236
|
+
|
|
237
|
+
params.add(0);
|
|
238
|
+
|
|
239
|
+
continue;
|
|
240
|
+
|
|
241
|
+
}
|
|
242
|
+
|
|
243
|
+
if (p.equals(char.class)) {
|
|
244
|
+
|
|
245
|
+
params.add('\u0000');
|
|
246
|
+
|
|
247
|
+
continue;
|
|
248
|
+
|
|
249
|
+
}
|
|
250
|
+
|
|
251
|
+
if (p.equals(float.class)) {
|
|
252
|
+
|
|
253
|
+
params.add(0f);
|
|
254
|
+
|
|
255
|
+
continue;
|
|
256
|
+
|
|
257
|
+
}
|
|
258
|
+
|
|
259
|
+
if (p.equals(double.class)) {
|
|
260
|
+
|
|
261
|
+
params.add(0d);
|
|
262
|
+
|
|
263
|
+
continue;
|
|
264
|
+
|
|
265
|
+
}
|
|
266
|
+
|
|
267
|
+
}
|
|
268
|
+
|
|
269
|
+
params.add(p.newInstance());
|
|
270
|
+
|
|
271
|
+
}
|
|
272
|
+
|
|
273
|
+
return params;
|
|
274
|
+
|
|
275
|
+
}
|
|
276
|
+
|
|
277
|
+
}
|
|
278
|
+
|
|
279
|
+
|
|
280
|
+
|
|
281
|
+
class Point {
|
|
282
|
+
|
|
283
|
+
double x1, y1, x;
|
|
284
|
+
|
|
285
|
+
double y = 2.0;
|
|
286
|
+
|
|
287
|
+
}
|
|
288
|
+
|
|
289
|
+
class Point2 {
|
|
290
|
+
|
|
291
|
+
double x1=2, y1, x;
|
|
292
|
+
|
|
293
|
+
double y = 2.0;
|
|
294
|
+
|
|
295
|
+
public Point2(double v) { this.x1 = v; }
|
|
296
|
+
|
|
297
|
+
}
|
|
298
|
+
|
|
299
|
+
class Point3 {
|
|
300
|
+
|
|
301
|
+
int x1, y1, x;
|
|
302
|
+
|
|
303
|
+
int y = 2;
|
|
304
|
+
|
|
305
|
+
public Point3(int v) { this.x1 = v; }
|
|
306
|
+
|
|
307
|
+
}
|
|
308
|
+
|
|
309
|
+
class Point4 {
|
|
310
|
+
|
|
311
|
+
String x1="aaa", y1, x;
|
|
312
|
+
|
|
313
|
+
int y = 2;
|
|
314
|
+
|
|
315
|
+
public Point4(String v) { this.x1 = v; }
|
|
316
|
+
|
|
317
|
+
}
|
|
318
|
+
|
|
319
|
+
```
|
1
複数例外catchに変更
test
CHANGED
|
@@ -18,45 +18,33 @@
|
|
|
18
18
|
|
|
19
19
|
try {
|
|
20
20
|
|
|
21
|
-
|
|
21
|
+
Class<?> c = inputFindClass();
|
|
22
22
|
|
|
23
|
-
|
|
23
|
+
// コンストラクタを呼び出してインスタンスを生成
|
|
24
24
|
|
|
25
|
-
|
|
25
|
+
Object obj = c.getDeclaredConstructor().newInstance();
|
|
26
26
|
|
|
27
|
-
|
|
27
|
+
for (Field fieled : c.getDeclaredFields()) {
|
|
28
28
|
|
|
29
|
-
|
|
29
|
+
fieled.setAccessible(true);
|
|
30
30
|
|
|
31
|
-
|
|
31
|
+
String fieldName = fieled.getName();
|
|
32
32
|
|
|
33
|
-
|
|
33
|
+
Class<?> fieldType = fieled.getType();
|
|
34
34
|
|
|
35
|
-
|
|
35
|
+
String fieldTypeStr = fieldType.getName();
|
|
36
36
|
|
|
37
|
-
|
|
37
|
+
System.out.print("Type : " + fieldTypeStr + ", Name : " + fieldName + ", Value : ");
|
|
38
38
|
|
|
39
|
-
|
|
39
|
+
try {
|
|
40
40
|
|
|
41
|
-
|
|
41
|
+
Object value = fieled.get(obj);
|
|
42
42
|
|
|
43
|
-
|
|
43
|
+
System.out.println(value);
|
|
44
44
|
|
|
45
|
-
|
|
45
|
+
} catch (IllegalArgumentException | IllegalAccessException e) {
|
|
46
46
|
|
|
47
|
-
System.out.print("Type : " + fieldTypeStr + ", Name : " + fieldName + ", Value : ");
|
|
48
|
-
|
|
49
|
-
try {
|
|
50
|
-
|
|
51
|
-
Object value = fieled.get(obj);
|
|
52
|
-
|
|
53
|
-
System.out.println(value);
|
|
54
|
-
|
|
55
|
-
} catch (Exception e) {
|
|
56
|
-
|
|
57
|
-
|
|
47
|
+
System.err.println(e);
|
|
58
|
-
|
|
59
|
-
}
|
|
60
48
|
|
|
61
49
|
}
|
|
62
50
|
|
|
@@ -72,6 +60,26 @@
|
|
|
72
60
|
|
|
73
61
|
}
|
|
74
62
|
|
|
63
|
+
|
|
64
|
+
|
|
65
|
+
public static Class<?> inputFindClass() throws ClassNotFoundException {
|
|
66
|
+
|
|
67
|
+
System.out.println("フィールドとフィールドの値を表示します．");
|
|
68
|
+
|
|
69
|
+
System.out.println("検査するクラスを入力してください");
|
|
70
|
+
|
|
71
|
+
System.out.print(">");
|
|
72
|
+
|
|
73
|
+
try (Scanner sc = new Scanner(System.in)) {
|
|
74
|
+
|
|
75
|
+
String className = sc.nextLine();
|
|
76
|
+
|
|
77
|
+
return Class.forName(className);
|
|
78
|
+
|
|
79
|
+
}
|
|
80
|
+
|
|
81
|
+
}
|
|
82
|
+
|
|
75
83
|
}
|
|
76
84
|
|
|
77
85
|
|
|
@@ -80,7 +88,7 @@
|
|
|
80
88
|
|
|
81
89
|
double x1, y1, x;
|
|
82
90
|
|
|
83
|
-
double y = 2.0;//値を取得できてるのかの確認値
|
|
91
|
+
double y = 2.0;// 値を取得できてるのかの確認値
|
|
84
92
|
|
|
85
93
|
}
|
|
86
94
|
|