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  * Copyright (c) 1994, 2013, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.  Oracle designates this
  * particular file as subject to the "Classpath" exception as provided
  * by Oracle in the LICENSE file that accompanied this code.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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  */
 
 package java.lang;
 
+import jdk.internal.HotSpotIntrinsicCandidate;
+
 /**
  * The Boolean class wraps a value of the primitive type
  * {@code boolean} in an object. An object of type
  * {@code Boolean} contains a single field whose type is
  * {@code boolean}.
  * <p>
  * In addition, this class provides many methods for
  * converting a {@code boolean} to a {@code String} and a
  * {@code String} to a {@code boolean}, as well as other
  * constants and methods useful when dealing with a
  * {@code boolean}.
  *
  * @author  Arthur van Hoff
- * @since   JDK1.0
+ * @since   1.0
  */
 public final class Boolean implements java.io.Serializable,
                                       Comparable<Boolean>
 {
     /**
      * The {@code Boolean} object corresponding to the primitive
      * value {@code true}.
      */
     public static final Boolean TRUE = new Boolean(true);
 
     /**
      * The {@code Boolean} object corresponding to the primitive
      * value {@code false}.
      */
     public static final Boolean FALSE = new Boolean(false);
 
     /**
      * The Class object representing the primitive type boolean.
      *
-     * @since   JDK1.1
+     * @since   1.1
      */
     @SuppressWarnings("unchecked")
     public static final Class<Boolean> TYPE = (Class<Boolean>) Class.getPrimitiveClass("boolean");
 
     /**
      * The value of the Boolean.
      *
      * @serial
      */
     private final boolean value;
 
     /** use serialVersionUID from JDK 1.0.2 for interoperability */
     private static final long serialVersionUID = -3665804199014368530L;
 
     /**
      * Allocates a {@code Boolean} object representing the
      * {@code value} argument.
      *
-     * <p><b>Note: It is rarely appropriate to use this constructor.
-     * Unless a <i>new</i> instance is required, the static factory
-     * {@link #valueOf(boolean)} is generally a better choice. It is
-     * likely to yield significantly better space and time performance.</b>
-     *
      * @param   value   the value of the {@code Boolean}.
+     *
+     * @deprecated
+     * It is rarely appropriate to use this constructor. The static factory
+     * {@link #valueOf(boolean)} is generally a better choice, as it is
+     * likely to yield significantly better space and time performance.
+     * Also consider using the final fields {@link #TRUE} and {@link #FALSE}
+     * if possible.
      */
+    @Deprecated(since="9")
     public Boolean(boolean value) {
         this.value = value;
     }
 
     /**
      * Allocates a {@code Boolean} object representing the value
      * {@code true} if the string argument is not {@code null}
      * and is equal, ignoring case, to the string {@code "true"}.
-     * Otherwise, allocate a {@code Boolean} object representing the
-     * value {@code false}. Examples:<p>
-     * {@code new Boolean("True")} produces a {@code Boolean} object
-     * that represents {@code true}.<br>
-     * {@code new Boolean("yes")} produces a {@code Boolean} object
-     * that represents {@code false}.
+     * Otherwise, allocates a {@code Boolean} object representing the
+     * value {@code false}.
      *
      * @param   s   the string to be converted to a {@code Boolean}.
+     *
+     * @deprecated
+     * It is rarely appropriate to use this constructor.
+     * Use {@link #parseBoolean(String)} to convert a string to a
+     * {@code boolean} primitive, or use {@link #valueOf(String)}
+     * to convert a string to a {@code Boolean} object.
      */
+    @Deprecated(since="9")
     public Boolean(String s) {
         this(parseBoolean(s));
     }
 
     /**
      * Parses the string argument as a boolean.  The {@code boolean}
      * returned represents the value {@code true} if the string argument
      * is not {@code null} and is equal, ignoring case, to the string
-     * {@code "true"}. <p>
+     * {@code "true"}.
+     * Otherwise, a false value is returned, including for a null
+     * argument.<p>
      * Example: {@code Boolean.parseBoolean("True")} returns {@code true}.<br>
      * Example: {@code Boolean.parseBoolean("yes")} returns {@code false}.
      *
      * @param      s   the {@code String} containing the boolean
      *                 representation to be parsed
      * @return     the boolean represented by the string argument
      * @since 1.5
      */
     public static boolean parseBoolean(String s) {
-        return ((s != null) && s.equalsIgnoreCase("true"));
+        return "true".equalsIgnoreCase(s);
     }
 
     /**
      * Returns the value of this {@code Boolean} object as a boolean
      * primitive.
      *
      * @return  the primitive {@code boolean} value of this object.
      */
+    @HotSpotIntrinsicCandidate
     public boolean booleanValue() {
         return value;
     }
 
     /**
      * Returns a {@code Boolean} instance representing the specified
      * {@code boolean} value.  If the specified {@code boolean} value
      * is {@code true}, this method returns {@code Boolean.TRUE};
      * if it is {@code false}, this method returns {@code Boolean.FALSE}.
      * If a new {@code Boolean} instance is not required, this method
      * should generally be used in preference to the constructor
      * {@link #Boolean(boolean)}, as this method is likely to yield
      * significantly better space and time performance.
      *
      * @param  b a boolean value.
      * @return a {@code Boolean} instance representing {@code b}.
      * @since  1.4
      */
+    @HotSpotIntrinsicCandidate
     public static Boolean valueOf(boolean b) {
         return (b ? TRUE : FALSE);
     }
 
     /**
      * Returns a {@code Boolean} with a value represented by the
      * specified string.  The {@code Boolean} returned represents a
      * true value if the string argument is not {@code null}
      * and is equal, ignoring case, to the string {@code "true"}.
+     * Otherwise, a false value is returned, including for a null
+     * argument.
      *
      * @param   s   a string.
      * @return  the {@code Boolean} value represented by the string.
      */
     public static Boolean valueOf(String s) {
         return parseBoolean(s) ? TRUE : FALSE;
     }
 
     /**
      * Returns a {@code String} object representing the specified
      * boolean.  If the specified boolean is {@code true}, then
      * the string {@code "true"} will be returned, otherwise the
      * string {@code "false"} will be returned.
      *
      * @param b the boolean to be converted
      * @return the string representation of the specified {@code boolean}
      * @since 1.4
      */
     public static String toString(boolean b) {
         return b ? "true" : "false";
     }
 
     /**
      * Returns a {@code String} object representing this Boolean's
      * value.  If this object represents the value {@code true},
      * a string equal to {@code "true"} is returned. Otherwise, a
      * string equal to {@code "false"} is returned.
      *
      * @return  a string representation of this object.
      */
     public String toString() {
         return value ? "true" : "false";
     }
 
     /**
      * Returns a hash code for this {@code Boolean} object.
      *
      * @return  the integer {@code 1231} if this object represents
      * {@code true}; returns the integer {@code 1237} if this
      * object represents {@code false}.
      */
     @Override
     public int hashCode() {
         return Boolean.hashCode(value);
     }
 
     /**
      * Returns a hash code for a {@code boolean} value; compatible with
      * {@code Boolean.hashCode()}.
      *
      * @param value the value to hash
      * @return a hash code value for a {@code boolean} value.
      * @since 1.8
      */
     public static int hashCode(boolean value) {
         return value ? 1231 : 1237;
     }
 
    /**
      * Returns {@code true} if and only if the argument is not
      * {@code null} and is a {@code Boolean} object that
      * represents the same {@code boolean} value as this object.
      *
      * @param   obj   the object to compare with.
      * @return  {@code true} if the Boolean objects represent the
      *          same value; {@code false} otherwise.
      */
     public boolean equals(Object obj) {
         if (obj instanceof Boolean) {
             return value == ((Boolean)obj).booleanValue();
         }
         return false;
     }
 
     /**
-     * Returns {@code true} if and only if the system property
-     * named by the argument exists and is equal to the string
-     * {@code "true"}. (Beginning with version 1.0.2 of the
-     * Java<small><sup>TM</sup></small> platform, the test of
-     * this string is case insensitive.) A system property is accessible
-     * through {@code getProperty}, a method defined by the
-     * {@code System} class.
-     * <p>
-     * If there is no property with the specified name, or if the specified
-     * name is empty or null, then {@code false} is returned.
+     * Returns {@code true} if and only if the system property named
+     * by the argument exists and is equal to, ignoring case, the
+     * string {@code "true"}.
+     * A system property is accessible through {@code getProperty}, a
+     * method defined by the {@code System} class.  <p> If there is no
+     * property with the specified name, or if the specified name is
+     * empty or null, then {@code false} is returned.
      *
      * @param   name   the system property name.
      * @return  the {@code boolean} value of the system property.
      * @throws  SecurityException for the same reasons as
      *          {@link System#getProperty(String) System.getProperty}
      * @see     java.lang.System#getProperty(java.lang.String)
      * @see     java.lang.System#getProperty(java.lang.String, java.lang.String)
      */
     public static boolean getBoolean(String name) {
         boolean result = false;
         try {
             result = parseBoolean(System.getProperty(name));
         } catch (IllegalArgumentException | NullPointerException e) {
         }
         return result;
     }
 
     /**
      * Compares this {@code Boolean} instance with another.
      *
      * @param   b the {@code Boolean} instance to be compared
      * @return  zero if this object represents the same boolean value as the
      *          argument; a positive value if this object represents true
      *          and the argument represents false; and a negative value if
      *          this object represents false and the argument represents true
      * @throws  NullPointerException if the argument is {@code null}
      * @see     Comparable
      * @since  1.5
      */
     public int compareTo(Boolean b) {
         return compare(this.value, b.value);
     }
 
     /**
      * Compares two {@code boolean} values.
      * The value returned is identical to what would be returned by:
      * <pre>
      *    Boolean.valueOf(x).compareTo(Boolean.valueOf(y))
      * </pre>
      *
      * @param  x the first {@code boolean} to compare
      * @param  y the second {@code boolean} to compare
      * @return the value {@code 0} if {@code x == y};
      *         a value less than {@code 0} if {@code !x && y}; and
      *         a value greater than {@code 0} if {@code x && !y}
      * @since 1.7
      */
     public static int compare(boolean x, boolean y) {
         return (x == y) ? 0 : (x ? 1 : -1);
     }
 
     /**
      * Returns the result of applying the logical AND operator to the
      * specified {@code boolean} operands.
      *
      * @param a the first operand
      * @param b the second operand
      * @return the logical AND of {@code a} and {@code b}
      * @see java.util.function.BinaryOperator
      * @since 1.8
      */
     public static boolean logicalAnd(boolean a, boolean b) {
         return a && b;
     }
 
     /**
      * Returns the result of applying the logical OR operator to the
      * specified {@code boolean} operands.
      *
      * @param a the first operand
      * @param b the second operand
      * @return the logical OR of {@code a} and {@code b}
      * @see java.util.function.BinaryOperator
      * @since 1.8
      */
     public static boolean logicalOr(boolean a, boolean b) {
         return a || b;
     }
 
     /**
      * Returns the result of applying the logical XOR operator to the
      * specified {@code boolean} operands.
      *
      * @param a the first operand
      * @param b the second operand
      * @return  the logical XOR of {@code a} and {@code b}
      * @see java.util.function.BinaryOperator
      * @since 1.8
      */
     public static boolean logicalXor(boolean a, boolean b) {
         return a ^ b;
     }
 }