• Boolean源码比较简单。

     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
    */
    @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}.
    */
    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}.
    *
    * @param s the string to be converted to a {@code Boolean}.
    */
    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>
    * 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"));
    } /**
    * Returns the value of this {@code Boolean} object as a boolean
    * primitive.
    *
    * @return the primitive {@code boolean} value of this object.
    */
    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
    */
    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"}.
    *
    * @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.
    *
    * @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;
    }
    }

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