1 /*
2 * Copyright (c) 2022, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23 /*
24 * @test
25 * @bug 8194743
26 * @summary Test valid placements of super()/this() in constructors
27 * @enablePreview
28 */
29
30 import java.util.concurrent.atomic.AtomicReference;
31
32 public class SuperInitGood {
33
34 SuperInitGood(Object obj) {
35 }
36
37 SuperInitGood(int x) {
38 }
39
40 // Default constructor provided by compiler
41 static class Test0 {
42 }
43
44 // No explicit calls to this()/super()
45 static class Test1 {
46 Test1() {
47 }
48 Test1(int a) {
49 this.hashCode();
50 }
51 }
52
53 // Explicit calls to this()/super()
54 static class Test2<T> {
55 static int i;
56 Test2() {
57 this(0);
58 }
59 Test2(int i) {
60 Test2.i = i;
61 super();
62 }
63 Test2(T obj) {
64 this(java.util.Objects.hashCode(obj));
65 }
66 public T get() {
67 return null;
68 }
69 }
70
71 // Explicit this()/super() with stuff in front
72 static class Test3 {
73 int x;
74 final int y;
75 final int z;
76
77 Test3() {
78 new Object().hashCode();
79 new Object().hashCode();
80 super();
81 this.x = new Object().hashCode();
82 this.y = new Object().hashCode() % 17;
83 this.z = this.x + this.y;
84 }
85 }
86
87 // Reference within constructor to outer class that's also my superclass
88 class Test5 extends SuperInitGood {
89 Test5(Object obj) {
90 if (obj == null)
91 throw new IllegalArgumentException();
92 super(SuperInitGood.this); // NOT a 'this' reference
93 }
94 }
95
96 // Initialization blocks
97 class Test6 {
98 final long startTime;
99 final int x;
100 {
101 this.x = 12;
102 }
103 Test6() {
104 long now = System.nanoTime();
105 long then = now + 1000000L;
106 while (System.nanoTime() < then) {
107 try {
108 Thread.sleep(1);
109 } catch (InterruptedException e) {
110 Thread.currentThread().interrupt();
111 break;
112 }
113 }
114 super();
115 this.startTime = now;
116 }
117 }
118
119 // Mix up inner classes, proxies, and super() calls
120 // Copied mostly from UnverifiableInitForNestedLocalClassTest.java
121 public static void test7(final String arg) {
122 final String inlined = " inlined ";
123 class LocalClass {
124 String m() {
125 return "LocalClass " + arg + inlined;
126 }
127
128 class SubClass extends LocalClass {
129 @Override
130 String m() {
131 return "SubClass " + arg + inlined;
132 }
133 }
134
135 class SubSubClass extends SubClass {
136 @Override
137 String m() {
138 return "SubSubClass " + arg + inlined;
139 }
140 }
141
142 class AnotherLocal {
143 class AnotherSub extends LocalClass {
144 AnotherSub() {
145 }
146 AnotherSub(int x) {
147 this((char)x);
148 }
149 AnotherSub(char y) {
150 super();
151 }
152 @Override
153 String m() {
154 return "AnotherSub " + arg + inlined;
155 }
156 }
157 }
158 }
159 }
160
161 // Anonymous inner class
162 public static void test8() {
163 new Test2<Byte>(null) {
164 @Override
165 public Byte get() {
166 return (byte)-1;
167 }
168 };
169 }
170
171 // Qualified super() invocation
172 public static class Test9 extends Test5 {
173
174 public Test9(SuperInitGood implicit, Object obj) {
175 obj.hashCode();
176 implicit.super(obj);
177 }
178 }
179
180 // Copied from WhichImplicitThis6
181 public static class Test10 {
182 private int i;
183 public Test10(int i) {}
184 public class Sub extends Test10 {
185 public Sub() {
186 super(i); // i is not inherited, so it is the enclosing i
187 }
188 }
189 }
190
191 // Two constructors where only one invokes super()
192 public static class Test11 {
193 public Test11() {
194 }
195 public Test11(int x) {
196 super();
197 }
198 }
199
200 // Nested version of the previous test
201 public static class Test12 {
202 Test12() {
203 class Sub {
204 public Sub() {
205 }
206 public Sub(int j) {
207 super();
208 }
209 }
210 }
211 }
212
213 // Nested super()'s requiring initialization code appended
214 public static class Test13 extends SuperInitGood {
215 final int x = new Object().hashCode();
216 Test13() {
217 super(new Object() {
218 public void foo() {
219 class Bar {
220 final int y = new Object().hashCode();
221 Bar() {
222 super();
223 }
224 Bar(int ignored) {
225 }
226 }
227 }
228 });
229 }
230 }
231
232 // Initializer in initializer block
233 public static class Test14 {
234 final int x; // initialized in constructor
235 final int y; // initialized in initialization block
236 final int z = 13; // initialized with intializer value
237 public Test14() {
238 this(0);
239 }
240 public Test14(boolean z) {
241 this.x = z ? 1 : 0;
242 }
243 public Test14(int x) {
244 super();
245 this.x = x;
246 }
247 {
248 this.y = -1;
249 }
250 }
251
252 // Qualified super() invocation with superclass instance
253 public static class Test15 {
254
255 final String name;
256
257 public Test15(String name) {
258 this.name = name;
259 }
260
261 public class Test15b extends Test15 {
262
263 public Test15b(String name) {
264 super(name);
265 }
266
267 public String getName() {
268 return Test15.this.name;
269 }
270 }
271 }
272
273 public static class Test15c extends Test15.Test15b {
274 public Test15c(Test15 a, String name) {
275 a.super(name);
276 }
277 }
278
279 // Mixing up outer instances, proxies, and initializers
280 public static class Test16 {
281
282 final String x = String.valueOf(new Object().hashCode());
283
284 public void run() {
285
286 final String y = String.valueOf(new Object().hashCode());
287
288 class Sub {
289
290 final String z;
291
292 Sub(String z, int ignored) {
293 this(z, (float)ignored);
294 }
295
296 Sub(String z, float ignored) {
297 this.z = z;
298 }
299
300 Sub(String z, byte ignored) {
301 super();
302 this.z = z;
303 }
304
305 Sub(String z, char ignored) {
306 this(z, (int)ignored);
307 }
308
309 String x() {
310 return x;
311 }
312
313 String y() {
314 return y;
315 }
316
317 String z() {
318 return z;
319 }
320 }
321
322 final String z = String.valueOf(new Object().hashCode());
323
324 final Sub[] subs = new Sub[] {
325 new Sub(z, 1),
326 new Sub(z, -1),
327 new Sub(z, (float)0),
328 new Sub(z, (byte)0),
329 new Sub(z, (char)0)
330 };
331
332 for (int i = 0; i < subs.length; i++) {
333 //System.err.println("i = " + i);
334 final Sub sub = subs[i];
335 final String subx = sub.x();
336 final String suby = sub.y();
337 final String subz = sub.z();
338 if (!x.equals(subx))
339 throw new RuntimeException("x=" + x + " but sub[" + i + "].x()=" + subx);
340 if (!y.equals(suby))
341 throw new RuntimeException("y=" + y + " but sub[" + i + "].y()=" + suby);
342 if (!z.equals(subz))
343 throw new RuntimeException("z=" + z + " but sub[" + i + "].z()=" + subz);
344 }
345 }
346 }
347
348 // Records
349 public class Test17 {
350
351 record Rectangle(float length, float width) { }
352
353 record StringHolder(String string) {
354 StringHolder {
355 java.util.Objects.requireNonNull(string);
356 }
357 }
358
359 record ValueHolder(int value) {
360 ValueHolder(float x) {
361 if (Float.isNaN(x))
362 throw new IllegalArgumentException();
363 this((int)x);
364 }
365 }
366 }
367
368 // Exceptions thrown by initializer block
369 public static class Test18 extends AtomicReference<Object> {
370
371 {
372 if ((this.get().hashCode() % 3) == 0)
373 throw new MyException();
374 }
375
376 public Test18(Object obj) throws MyException {
377 super(obj);
378 }
379
380 public Test18(boolean fail) throws MyException {
381 Object obj;
382 for (obj = new Object(); true; obj = new Object()) {
383 if (((obj.hashCode() % 3) == 0) != fail)
384 continue;
385 break;
386 }
387 this(obj);
388 }
389
390 public static class MyException extends Exception {
391 }
392 }
393
394 // super()/this() within outer try block but inside inner class
395 public static class Test19 {
396 public Test19(int x) {
397 try {
398 new Test1(x) {
399 @Override
400 public int hashCode() {
401 return x ^ super.hashCode();
402 }
403 };
404 } catch (StackOverflowError e) {
405 // ignore
406 }
407 }
408 }
409
410 // local class declared before super(), but not used until after super()
411 public static class Test20 {
412 public Test20() {
413 class Foo {
414 Foo() {
415 Test20.this.hashCode();
416 }
417 }
418 super();
419 new Foo();
420 }
421 }
422
423 // local class inside super() parameter list
424 public static class Test21 extends AtomicReference<Object> {
425 private int x;
426 public Test21() {
427 super(switch ("foo".hashCode()) {
428 default -> {
429 class Nested {{ System.out.println(x); }} // class is NOT instantiated - OK
430 yield "bar";
431 }
432 });
433 }
434 }
435
436 public static void main(String[] args) {
437 new Test0();
438 new Test1();
439 new Test1(7);
440 new Test2<Byte>();
441 new Test2<>(args);
442 new Test3();
443 new SuperInitGood(3).new Test5(3);
444 new SuperInitGood(3).new Test6();
445 SuperInitGood.test7("foo");
446 SuperInitGood.test8();
447 new Test9(new SuperInitGood(5), "abc");
448 new Test10(7);
449 new Test11(9);
450 new Test12();
451 new Test13();
452 Test14 t14 = new Test14();
453 assert t14.x == 0 && t14.y == -1 && t14.z == 13;
454 t14 = new Test14(7);
455 assert t14.x == 7 && t14.y == -1 && t14.z == 13;
456 new Test15c(new Test15("foo"), "bar");
457 new Test16().run();
458 new Test17.StringHolder("foo");
459 try {
460 new Test17.StringHolder(null);
461 throw new Error();
462 } catch (NullPointerException e) {
463 // expected
464 }
465 try {
466 new Test18(true);
467 assert false : "expected exception";
468 } catch (Test18.MyException e) {
469 // expected
470 }
471 try {
472 new Test18(false);
473 } catch (Test18.MyException e) {
474 assert false : "unexpected exception: " + e;
475 }
476 new Test19(123);
477 new Test20();
478 new Test21();
479 }
480 }