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modules/base/src/main/java/javafx/util/Pair.java

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rev 9268 : 8140503: JavaFX "Pair" Hash Code Collisions


   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package javafx.util;
  27 
  28 import java.io.Serializable;

  29 import javafx.beans.NamedArg;
  30 
  31  /**
  32   * <p>A convenience class to represent name-value pairs.</p>
  33   * @since JavaFX 2.0
  34   */
  35 public class Pair<K,V> implements Serializable{
  36 
  37     /**
  38      * Key of this <code>Pair</code>.
  39      */
  40     private K key;
  41 
  42     /**
  43      * Gets the key for this pair.
  44      * @return key for this pair
  45      */
  46     public K getKey() { return key; }
  47 
  48     /**


  72      *
  73      * <p>The default name/value delimiter '=' is always used.</p>
  74      *
  75      *  @return <code>String</code> representation of this <code>Pair</code>
  76      */
  77     @Override
  78     public String toString() {
  79         return key + "=" + value;
  80     }
  81 
  82     /**
  83      * <p>Generate a hash code for this <code>Pair</code>.</p>
  84      *
  85      * <p>The hash code is calculated using both the name and
  86      * the value of the <code>Pair</code>.</p>
  87      *
  88      * @return hash code for this <code>Pair</code>
  89      */
  90     @Override
  91     public int hashCode() {
  92         // name's hashCode is multiplied by an arbitrary prime number (13)
  93         // in order to make sure there is a difference in the hashCode between
  94         // these two parameters:
  95         //  name: a  value: aa
  96         //  name: aa value: a
  97         return key.hashCode() * 13 + (value == null ? 0 : value.hashCode());
  98     }
  99 
 100      /**
 101       * <p>Test this <code>Pair</code> for equality with another
 102       * <code>Object</code>.</p>
 103       *
 104       * <p>If the <code>Object</code> to be tested is not a
 105       * <code>Pair</code> or is <code>null</code>, then this method
 106       * returns <code>false</code>.</p>
 107       *
 108       * <p>Two <code>Pair</code>s are considered equal if and only if
 109       * both the names and values are equal.</p>
 110       *
 111       * @param o the <code>Object</code> to test for
 112       * equality with this <code>Pair</code>
 113       * @return <code>true</code> if the given <code>Object</code> is
 114       * equal to this <code>Pair</code> else <code>false</code>
 115       */
 116      @Override
 117      public boolean equals(Object o) {


   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package javafx.util;
  27 
  28 import java.io.Serializable;
  29 import java.util.Objects;
  30 import javafx.beans.NamedArg;
  31 
  32  /**
  33   * <p>A convenience class to represent name-value pairs.</p>
  34   * @since JavaFX 2.0
  35   */
  36 public class Pair<K,V> implements Serializable{
  37 
  38     /**
  39      * Key of this <code>Pair</code>.
  40      */
  41     private K key;
  42 
  43     /**
  44      * Gets the key for this pair.
  45      * @return key for this pair
  46      */
  47     public K getKey() { return key; }
  48 
  49     /**


  73      *
  74      * <p>The default name/value delimiter '=' is always used.</p>
  75      *
  76      *  @return <code>String</code> representation of this <code>Pair</code>
  77      */
  78     @Override
  79     public String toString() {
  80         return key + "=" + value;
  81     }
  82 
  83     /**
  84      * <p>Generate a hash code for this <code>Pair</code>.</p>
  85      *
  86      * <p>The hash code is calculated using both the name and
  87      * the value of the <code>Pair</code>.</p>
  88      *
  89      * @return hash code for this <code>Pair</code>
  90      */
  91     @Override
  92     public int hashCode() {
  93         return Objects.hash(key, value);





  94     }
  95 
  96      /**
  97       * <p>Test this <code>Pair</code> for equality with another
  98       * <code>Object</code>.</p>
  99       *
 100       * <p>If the <code>Object</code> to be tested is not a
 101       * <code>Pair</code> or is <code>null</code>, then this method
 102       * returns <code>false</code>.</p>
 103       *
 104       * <p>Two <code>Pair</code>s are considered equal if and only if
 105       * both the names and values are equal.</p>
 106       *
 107       * @param o the <code>Object</code> to test for
 108       * equality with this <code>Pair</code>
 109       * @return <code>true</code> if the given <code>Object</code> is
 110       * equal to this <code>Pair</code> else <code>false</code>
 111       */
 112      @Override
 113      public boolean equals(Object o) {
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