| 253 |
|
* @throws IllegalArgumentException {@inheritDoc} |
| 254 |
|
*/ |
| 255 |
|
public void putAll(Map<? extends K, ? extends V> m) { |
| 256 |
< |
Iterator<? extends Entry<? extends K, ? extends V>> i = m.entrySet().iterator(); |
| 257 |
< |
while (i.hasNext()) { |
| 258 |
< |
Entry<? extends K, ? extends V> e = i.next(); |
| 259 |
< |
put(e.getKey(), e.getValue()); |
| 260 |
< |
} |
| 256 |
> |
for (Map.Entry<? extends K, ? extends V> e : m.entrySet()) |
| 257 |
> |
put(e.getKey(), e.getValue()); |
| 258 |
|
} |
| 259 |
|
|
| 260 |
|
/** |
| 385 |
|
// Comparison and hashing |
| 386 |
|
|
| 387 |
|
/** |
| 388 |
< |
* {@inheritDoc} |
| 388 |
> |
* Compares the specified object with this map for equality. Returns |
| 389 |
> |
* <tt>true</tt> if the given object is also a map and the two maps |
| 390 |
> |
* represent the same mappings. More formally, two maps <tt>m1</tt> and |
| 391 |
> |
* <tt>m2</tt> represent the same mappings if |
| 392 |
> |
* <tt>m1.entrySet().equals(m2.entrySet())</tt>. This ensures that the |
| 393 |
> |
* <tt>equals</tt> method works properly across different implementations |
| 394 |
> |
* of the <tt>Map</tt> interface. |
| 395 |
|
* |
| 396 |
|
* <p>This implementation first checks if the specified object is this map; |
| 397 |
|
* if so it returns <tt>true</tt>. Then, it checks if the specified |
| 401 |
|
* contains each mapping that this map contains. If the specified map |
| 402 |
|
* fails to contain such a mapping, <tt>false</tt> is returned. If the |
| 403 |
|
* iteration completes, <tt>true</tt> is returned. |
| 404 |
+ |
* |
| 405 |
+ |
* @param o object to be compared for equality with this map |
| 406 |
+ |
* @return <tt>true</tt> if the specified object is equal to this map |
| 407 |
|
*/ |
| 408 |
|
public boolean equals(Object o) { |
| 409 |
|
if (o == this) |
| 439 |
|
} |
| 440 |
|
|
| 441 |
|
/** |
| 442 |
< |
* {@inheritDoc} |
| 442 |
> |
* Returns the hash code value for this map. The hash code of a map is |
| 443 |
> |
* defined to be the sum of the hash codes of each entry in the map's |
| 444 |
> |
* <tt>entrySet()</tt> view. This ensures that <tt>m1.equals(m2)</tt> |
| 445 |
> |
* implies that <tt>m1.hashCode()==m2.hashCode()</tt> for any two maps |
| 446 |
> |
* <tt>m1</tt> and <tt>m2</tt>, as required by the general contract of |
| 447 |
> |
* {@link Object#hashCode}. |
| 448 |
|
* |
| 449 |
|
* <p>This implementation iterates over <tt>entrySet()</tt>, calling |
| 450 |
< |
* <tt>hashCode()</tt> on each element (entry) in the set, and |
| 451 |
< |
* adding up the results. |
| 450 |
> |
* {@link Map.Entry#hashCode hashCode()} on each element (entry) in the |
| 451 |
> |
* set, and adding up the results. |
| 452 |
|
* |
| 453 |
+ |
* @return the hash code value for this map |
| 454 |
|
* @see Map.Entry#hashCode() |
| 443 |
– |
* @see Object#hashCode() |
| 455 |
|
* @see Object#equals(Object) |
| 456 |
|
* @see Set#equals(Object) |
| 457 |
|
*/ |
| 471 |
|
* <tt>", "</tt> (comma and space). Each key-value mapping is rendered as |
| 472 |
|
* the key followed by an equals sign (<tt>"="</tt>) followed by the |
| 473 |
|
* associated value. Keys and values are converted to strings as by |
| 474 |
< |
* <tt>String.valueOf(Object)</tt>.<p> |
| 474 |
> |
* {@link String#valueOf(Object)}. |
| 475 |
|
* |
| 476 |
< |
* This implementation creates an empty string buffer, appends a left |
| 466 |
< |
* brace, and iterates over the map's <tt>entrySet</tt> view, appending |
| 467 |
< |
* the string representation of each <tt>map.entry</tt> in turn. After |
| 468 |
< |
* appending each entry except the last, the string <tt>", "</tt> is |
| 469 |
< |
* appended. Finally a right brace is appended. A string is obtained |
| 470 |
< |
* from the stringbuffer, and returned. |
| 471 |
< |
* |
| 472 |
< |
* @return a String representation of this map |
| 476 |
> |
* @return a string representation of this map |
| 477 |
|
*/ |
| 478 |
|
public String toString() { |
| 475 |
– |
StringBuilder sb = new StringBuilder(); |
| 476 |
– |
sb.append("{"); |
| 477 |
– |
|
| 479 |
|
Iterator<Entry<K,V>> i = entrySet().iterator(); |
| 480 |
< |
boolean hasNext = i.hasNext(); |
| 481 |
< |
while (hasNext) { |
| 480 |
> |
if (! i.hasNext()) |
| 481 |
> |
return "{}"; |
| 482 |
> |
|
| 483 |
> |
StringBuilder sb = new StringBuilder(); |
| 484 |
> |
sb.append('{'); |
| 485 |
> |
for (;;) { |
| 486 |
|
Entry<K,V> e = i.next(); |
| 487 |
|
K key = e.getKey(); |
| 488 |
< |
V value = e.getValue(); |
| 489 |
< |
if (key == this) |
| 490 |
< |
sb.append("(this Map)"); |
| 491 |
< |
else |
| 492 |
< |
sb.append(key); |
| 493 |
< |
sb.append("="); |
| 494 |
< |
if (value == this) |
| 495 |
< |
sb.append("(this Map)"); |
| 491 |
< |
else |
| 492 |
< |
sb.append(value); |
| 493 |
< |
hasNext = i.hasNext(); |
| 494 |
< |
if (hasNext) |
| 495 |
< |
sb.append(", "); |
| 496 |
< |
} |
| 497 |
< |
|
| 498 |
< |
sb.append("}"); |
| 499 |
< |
return sb.toString(); |
| 488 |
> |
V value = e.getValue(); |
| 489 |
> |
sb.append(key == this ? "(this Map)" : key); |
| 490 |
> |
sb.append('='); |
| 491 |
> |
sb.append(value == this ? "(this Map)" : value); |
| 492 |
> |
if (! i.hasNext()) |
| 493 |
> |
return sb.append('}').toString(); |
| 494 |
> |
sb.append(", "); |
| 495 |
> |
} |
| 496 |
|
} |
| 497 |
|
|
| 498 |
|
/** |
| 513 |
|
* Test for equality, checking for nulls. |
| 514 |
|
*/ |
| 515 |
|
private static boolean eq(Object o1, Object o2) { |
| 516 |
< |
return (o1 == null ? o2 == null : o1.equals(o2)); |
| 516 |
> |
return o1 == null ? o2 == null : o1.equals(o2); |
| 517 |
|
} |
| 518 |
|
|
| 519 |
|
// Implementation Note: SimpleEntry and SimpleImmutableEntry |
| 530 |
|
* facilitates the process of building custom map |
| 531 |
|
* implementations. For example, it may be convenient to return |
| 532 |
|
* arrays of <tt>SimpleEntry</tt> instances in method |
| 533 |
< |
* <tt>Map.entrySet().toArray</tt> |
| 533 |
> |
* <tt>Map.entrySet().toArray</tt>. |
| 534 |
> |
* |
| 535 |
> |
* @since 1.6 |
| 536 |
|
*/ |
| 537 |
< |
public static class SimpleEntry<K,V> implements Entry<K,V> { |
| 537 |
> |
public static class SimpleEntry<K,V> |
| 538 |
> |
implements Entry<K,V>, java.io.Serializable |
| 539 |
> |
{ |
| 540 |
> |
private static final long serialVersionUID = -8499721149061103585L; |
| 541 |
> |
|
| 542 |
|
private final K key; |
| 543 |
|
private V value; |
| 544 |
|
|
| 604 |
|
} |
| 605 |
|
|
| 606 |
|
public int hashCode() { |
| 607 |
< |
return ((key == null) ? 0 : key.hashCode()) ^ |
| 608 |
< |
((value == null) ? 0 : value.hashCode()); |
| 607 |
> |
return (key == null ? 0 : key.hashCode()) ^ |
| 608 |
> |
(value == null ? 0 : value.hashCode()); |
| 609 |
|
} |
| 610 |
|
|
| 611 |
|
/** |
| 623 |
|
} |
| 624 |
|
|
| 625 |
|
/** |
| 626 |
< |
* An Entry maintaining an immutable key and value, This class |
| 626 |
> |
* An Entry maintaining an immutable key and value. This class |
| 627 |
|
* does not support method <tt>setValue</tt>. This class may be |
| 628 |
|
* convenient in methods that return thread-safe snapshots of |
| 629 |
|
* key-value mappings. |
| 630 |
+ |
* |
| 631 |
+ |
* @since 1.6 |
| 632 |
|
*/ |
| 633 |
< |
public static class SimpleImmutableEntry<K,V> implements Entry<K,V> { |
| 633 |
> |
public static class SimpleImmutableEntry<K,V> |
| 634 |
> |
implements Entry<K,V>, java.io.Serializable |
| 635 |
> |
{ |
| 636 |
> |
private static final long serialVersionUID = 7138329143949025153L; |
| 637 |
> |
|
| 638 |
|
private final K key; |
| 639 |
|
private final V value; |
| 640 |
|
|
| 701 |
|
} |
| 702 |
|
|
| 703 |
|
public int hashCode() { |
| 704 |
< |
return ((key == null) ? 0 : key.hashCode()) ^ |
| 705 |
< |
((value == null) ? 0 : value.hashCode()); |
| 704 |
> |
return (key == null ? 0 : key.hashCode()) ^ |
| 705 |
> |
(value == null ? 0 : value.hashCode()); |
| 706 |
|
} |
| 707 |
|
|
| 708 |
|
/** |
