public static boolean nullSafeEquals(Object o1, Object o2) {
        if (o1 == o2) {
            return true;
        }
        if (o1 == null || o2 == null) {
            return false;
        }
        if (o1.equals(o2)) {
            return true;
        }
        if (o1.getClass().isArray() && o2.getClass().isArray()) {
            if (o1 instanceof Object[] && o2 instanceof Object[]) {
                return Arrays.equals((Object[]) o1, (Object[]) o2);
            }
            if (o1 instanceof boolean[] && o2 instanceof boolean[]) {
                return Arrays.equals((boolean[]) o1, (boolean[]) o2);
            }
            if (o1 instanceof byte[] && o2 instanceof byte[]) {
                return Arrays.equals((byte[]) o1, (byte[]) o2);
            }
            if (o1 instanceof char[] && o2 instanceof char[]) {
                return Arrays.equals((char[]) o1, (char[]) o2);
            }
            if (o1 instanceof double[] && o2 instanceof double[]) {
                return Arrays.equals((double[]) o1, (double[]) o2);
            }
            if (o1 instanceof float[] && o2 instanceof float[]) {
                return Arrays.equals((float[]) o1, (float[]) o2);
            }
            if (o1 instanceof int[] && o2 instanceof int[]) {
                return Arrays.equals((int[]) o1, (int[]) o2);
            }
            if (o1 instanceof long[] && o2 instanceof long[]) {
                return Arrays.equals((long[]) o1, (long[]) o2);
            }
            if (o1 instanceof short[] && o2 instanceof short[]) {
                return Arrays.equals((short[]) o1, (short[]) o2);
            }
        }
        return false;
    }

    /**
     * Return as hash code for the given object; typically the value of {@code Object#hashCode()}}. If
     * the object is an array, this method will delegate to any of the {@code nullSafeHashCode}
     * methods for arrays in this class. If the object is {@code null}, this method returns 0.
     *
     * @see #nullSafeHashCode(Object[])
     * @see #nullSafeHashCode(boolean[])
     * @see #nullSafeHashCode(byte[])
     * @see #nullSafeHashCode(char[])
     * @see #nullSafeHashCode(double[])
     * @see #nullSafeHashCode(float[])
     * @see #nullSafeHashCode(int[])
     * @see #nullSafeHashCode(long[])
     * @see #nullSafeHashCode(short[])
     */
    public static int nullSafeHashCode(Object obj) {
        if (obj == null) {
            return 0;
        }
        if (obj.getClass().isArray()) {
            if (obj instanceof Object[]) {
                return nullSafeHashCode((Object[]) obj);
            }
            if (obj instanceof boolean[]) {
                return nullSafeHashCode((boolean[]) obj);
            }
            if (obj instanceof byte[]) {
                return nullSafeHashCode((byte[]) obj);
            }
            if (obj instanceof char[]) {
                return nullSafeHashCode((char[]) obj);
            }
            if (obj instanceof double[]) {
                return nullSafeHashCode((double[]) obj);
            }
            if (obj instanceof float[]) {
                return nullSafeHashCode((float[]) obj);
            }
            if (obj instanceof int[]) {
                return nullSafeHashCode((int[]) obj);
            }
            if (obj instanceof long[]) {
                return nullSafeHashCode((long[]) obj);
            }
            if (obj instanceof short[]) {
                return nullSafeHashCode((short[]) obj);
            }
        }
        return obj.hashCode();
    }

    /**
     * Return a hash code based on the contents of the specified array. If {@code array} is {@code
     * null}, this method returns 0.
     */
    public static int nullSafeHashCode(Object[] array) {
        if (array == null) {
            return 0;
        }
        int hash = INITIAL_HASH;
        for (Object element : array) {
            hash = MULTIPLIER * hash + nullSafeHashCode(element);
        }
        return hash;
    }

    /**
     * Return a hash code based on the contents of the specified array. If {@code array} is {@code
     * null}, this method returns 0.
     */
    public static int nullSafeHashCode(boolean[] array) {
        if (array == null) {
            return 0;
        }
        int hash = INITIAL_HASH;
        for (boolean element : array) {
            hash = MULTIPLIER * hash + hashCode(element);
        }
        return hash;
    }

    /**
     * Return a hash code based on the contents of the specified array. If {@code array} is {@code
     * null}, this method returns 0.
     */
    public static int nullSafeHashCode(byte[] array) {
        if (array == null) {
            return 0;
        }
        int hash = INITIAL_HASH;
        for (byte element : array) {
            hash = MULTIPLIER * hash + element;
        }
        return hash;
    }

    /**
     * Return a hash code based on the contents of the specified array. If {@code array} is {@code
     * null}, this method returns 0.
     */
    public static int nullSafeHashCode(char[] array) {
        if (array == null) {
            return 0;
        }
        int hash = INITIAL_HASH;
        for (char element : array) {
            hash = MULTIPLIER * hash + element;
        }
        return hash;
    }

    /**
     * Return a hash code based on the contents of the specified array. If {@code array} is {@code
     * null}, this method returns 0.
     */
    public static int nullSafeHashCode(double[] array) {
        if (array == null) {
            return 0;
        }
        int hash = INITIAL_HASH;
        for (double element : array) {
            hash = MULTIPLIER * hash + hashCode(element);
        }
        return hash;
    }

    /**
     * Return a hash code based on the contents of the specified array. If {@code array} is {@code
     * null}, this method returns 0.
     */
    public static int nullSafeHashCode(float[] array) {
        if (array == null) {
            return 0;
        }
        int hash = INITIAL_HASH;
        for (float element : array) {
            hash = MULTIPLIER * hash + hashCode(element);
        }
        return hash;
    }

    /**
     * Return a hash code based on the contents of the specified array. If {@code array} is {@code
     * null}, this method returns 0.
     */
    public static int nullSafeHashCode(int[] array) {
        if (array == null) {
            return 0;
        }
        int hash = INITIAL_HASH;
        for (int element : array) {
            hash = MULTIPLIER * hash + element;
        }
        return hash;
    }

    /**
     * Return a hash code based on the contents of the specified array. If {@code array} is {@code
     * null}, this method returns 0.
     */
    public static int nullSafeHashCode(long[] array) {
        if (array == null) {
            return 0;
        }
        int hash = INITIAL_HASH;
        for (long element : array) {
            hash = MULTIPLIER * hash + hashCode(element);
        }
        return hash;
    }

    /**
     * Return a hash code based on the contents of the specified array. If {@code array} is {@code
     * null}, this method returns 0.
     */
    public static int nullSafeHashCode(short[] array) {
        if (array == null) {
            return 0;
        }
        int hash = INITIAL_HASH;
        for (short element : array) {
            hash = MULTIPLIER * hash + element;
        }
        return hash;
    }

    /**
     * Return the same value as {@link Boolean#hashCode()}}.
     *
     * @see Boolean#hashCode()
     */
    public static int hashCode(boolean bool) {
        return (bool ? 1231 : 1237);
    }

    /**
     * Return the same value as {@link Double#hashCode()}}.
     *
     * @see Double#hashCode()
     */
    public static int hashCode(double dbl) {
        return hashCode(Double.doubleToLongBits(dbl));
    }

    /**
     * Return the same value as {@link Float#hashCode()}}.
     *
     * @see Float#hashCode()
     */
    public static int hashCode(float flt) {
        return Float.floatToIntBits(flt);
    }

    /**
     * Return the same value as {@link Long#hashCode()}}.
     *
     * @see Long#hashCode()
     */
    public static int hashCode(long lng) {
        return (int) (lng ^ (lng >>> 32));
    }

    //---------------------------------------------------------------------
    // Convenience methods for toString output
    //---------------------------------------------------------------------

    /**
     * Return a String representation of the specified Object. <p>Builds a String representation of
     * the contents in case of an array. Returns {@code "null"} if {@code obj} is {@code null}.
     *
     * @param obj the object to build a String representation for
     * @return a String representation of {@code obj}
     */
    public static String nullSafeToString(Object obj) {
        if (obj == null) {
            return NULL_STRING;
        }
        if (obj instanceof String) {
            return (String) obj;
        }
        if (obj instanceof Object[]) {
            return nullSafeToString((Object[]) obj);
        }
        if (obj instanceof boolean[]) {
            return nullSafeToString((boolean[]) obj);
        }
        if (obj instanceof byte[]) {
            return nullSafeToString((byte[]) obj);
        }
        if (obj instanceof char[]) {
            return nullSafeToString((char[]) obj);
        }
        if (obj instanceof double[]) {
            return nullSafeToString((double[]) obj);
        }
        if (obj instanceof float[]) {
            return nullSafeToString((float[]) obj);
        }
        if (obj instanceof int[]) {
            return nullSafeToString((int[]) obj);
        }
        if (obj instanceof long[]) {
            return nullSafeToString((long[]) obj);
        }
        if (obj instanceof short[]) {
            return nullSafeToString((short[]) obj);
        }
        return obj.toString();
    }

    /**
     * Return a String representation of the contents of the specified array. <p>The String
     * representation consists of a list of the array's elements, enclosed in curly braces ({@code
     * "{}"}). Adjacent elements are separated by the characters {@code ", "} (a comma followed by a
     * space). Returns {@code "null"} if {@code array} is {@code null}.
     *
     * @param array the array to build a String representation for
     * @return a String representation of {@code array}
     */
    public static String nullSafeToString(Object[] array) {
        if (array == null) {
            return NULL_STRING;
        }
        int length = array.length;
        if (length == 0) {
            return EMPTY_ARRAY;
        }
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < length; i++) {
            if (i == 0) {
                sb.append(ARRAY_START);
            } else {
                sb.append(ARRAY_ELEMENT_SEPARATOR);
            }
            sb.append(String.valueOf(array[i]));
        }
        sb.append(ARRAY_END);
        return sb.toString();
    }

    /**
     * Return a String representation of the contents of the specified array. <p>The String
     * representation consists of a list of the array's elements, enclosed in curly braces ({@code
     * "{}"}). Adjacent elements are separated by the characters {@code ", "} (a comma followed by a
     * space). Returns {@code "null"} if {@code array} is {@code null}.
     *
     * @param array the array to build a String representation for
     * @return a String representation of {@code array}
     */
    public static String nullSafeToString(boolean[] array) {
        if (array == null) {
            return NULL_STRING;
        }
        int length = array.length;
        if (length == 0) {
            return EMPTY_ARRAY;
        }
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < length; i++) {
            if (i == 0) {
                sb.append(ARRAY_START);
            } else {
                sb.append(ARRAY_ELEMENT_SEPARATOR);
            }

            sb.append(array[i]);
        }
        sb.append(ARRAY_END);
        return sb.toString();
    }

    /**
     * Return a String representation of the contents of the specified array. <p>The String
     * representation consists of a list of the array's elements, enclosed in curly braces ({@code
     * "{}"}). Adjacent elements are separated by the characters {@code ", "} (a comma followed by a
     * space). Returns {@code "null"} if {@code array} is {@code null}.
     *
     * @param array the array to build a String representation for
     * @return a String representation of {@code array}
     */
    public static String nullSafeToString(byte[] array) {
        if (array == null) {
            return NULL_STRING;
        }
        int length = array.length;
        if (length == 0) {
            return EMPTY_ARRAY;
        }
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < length; i++) {
            if (i == 0) {
                sb.append(ARRAY_START);
            } else {
                sb.append(ARRAY_ELEMENT_SEPARATOR);
            }
            sb.append(array[i]);
        }
        sb.append(ARRAY_END);
        return sb.toString();
    }

    /**
     * Return a String representation of the contents of the specified array. <p>The String
     * representation consists of a list of the array's elements, enclosed in curly braces ({@code
     * "{}"}). Adjacent elements are separated by the characters {@code ", "} (a comma followed by a
     * space). Returns {@code "null"} if {@code array} is {@code null}.
     *
     * @param array the array to build a String representation for
     * @return a String representation of {@code array}
     */
    public static String nullSafeToString(char[] array) {
        if (array == null) {
            return NULL_STRING;
        }
        int length = array.length;
        if (length == 0) {
            return EMPTY_ARRAY;
        }
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < length; i++) {
            if (i == 0) {
                sb.append(ARRAY_START);
            } else {
                sb.append(ARRAY_ELEMENT_SEPARATOR);
            }
            sb.append("'").append(array[i]).append("'");
        }
        sb.append(ARRAY_END);
        return sb.toString();
    }

    /**
     * Return a String representation of the contents of the specified array. <p>The String
     * representation consists of a list of the array's elements, enclosed in curly braces ({@code
     * "{}"}). Adjacent elements are separated by the characters {@code ", "} (a comma followed by a
     * space). Returns {@code "null"} if {@code array} is {@code null}.
     *
     * @param array the array to build a String representation for
     * @return a String representation of {@code array}
     */
    public static String nullSafeToString(double[] array) {
        if (array == null) {
            return NULL_STRING;
        }
        int length = array.length;
        if (length == 0) {
            return EMPTY_ARRAY;
        }
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < length; i++) {
            if (i == 0) {
                sb.append(ARRAY_START);
            } else {
                sb.append(ARRAY_ELEMENT_SEPARATOR);
            }

            sb.append(array[i]);
        }
        sb.append(ARRAY_END);
        return sb.toString();
    }

    /**
     * Return a String representation of the contents of the specified array. <p>The String
     * representation consists of a list of the array's elements, enclosed in curly braces ({@code
     * "{}"}). Adjacent elements are separated by the characters {@code ", "} (a comma followed by a
     * space). Returns {@code "null"} if {@code array} is {@code null}.
     *
     * @param array the array to build a String representation for
     * @return a String representation of {@code array}
     */
    public static String nullSafeToString(float[] array) {
        if (array == null) {
            return NULL_STRING;
        }
        int length = array.length;
        if (length == 0) {
            return EMPTY_ARRAY;
        }
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < length; i++) {
            if (i == 0) {
                sb.append(ARRAY_START);
            } else {
                sb.append(ARRAY_ELEMENT_SEPARATOR);
            }

            sb.append(array[i]);
        }
        sb.append(ARRAY_END);
        return sb.toString();
    }

    /**
     * Return a String representation of the contents of the specified array. <p>The String
     * representation consists of a list of the array's elements, enclosed in curly braces ({@code
     * "{}"}). Adjacent elements are separated by the characters {@code ", "} (a comma followed by a
     * space). Returns {@code "null"} if {@code array} is {@code null}.
     *
     * @param array the array to build a String representation for
     * @return a String representation of {@code array}
     */
    public static String nullSafeToString(int[] array) {
        if (array == null) {
            return NULL_STRING;
        }
        int length = array.length;
        if (length == 0) {
            return EMPTY_ARRAY;
        }
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < length; i++) {
            if (i == 0) {
                sb.append(ARRAY_START);
            } else {
                sb.append(ARRAY_ELEMENT_SEPARATOR);
            }
            sb.append(array[i]);
        }
        sb.append(ARRAY_END);
        return sb.toString();
    }

    /**
     * Return a String representation of the contents of the specified array. <p>The String
     * representation consists of a list of the array's elements, enclosed in curly braces ({@code
     * "{}"}). Adjacent elements are separated by the characters {@code ", "} (a comma followed by a
     * space). Returns {@code "null"} if {@code array} is {@code null}.
     *
     * @param array the array to build a String representation for
     * @return a String representation of {@code array}
     */
    public static String nullSafeToString(long[] array) {
        if (array == null) {
            return NULL_STRING;
        }
        int length = array.length;
        if (length == 0) {
            return EMPTY_ARRAY;
        }
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < length; i++) {
            if (i == 0) {
                sb.append(ARRAY_START);
            } else {
                sb.append(ARRAY_ELEMENT_SEPARATOR);
            }
            sb.append(array[i]);
        }
        sb.append(ARRAY_END);
        return sb.toString();
    }

    /**
     * Return a String representation of the contents of the specified array. <p>The String
     * representation consists of a list of the array's elements, enclosed in curly braces ({@code
     * "{}"}). Adjacent elements are separated by the characters {@code ", "} (a comma followed by a
     * space). Returns {@code "null"} if {@code array} is {@code null}.
     *
     * @param array the array to build a String representation for
     * @return a String representation of {@code array}
     */
    public static String nullSafeToString(short[] array) {
        if (array == null) {
            return NULL_STRING;
        }
        int length = array.length;
        if (length == 0) {
            return EMPTY_ARRAY;
        }
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < length; i++) {
            if (i == 0) {
                sb.append(ARRAY_START);
            } else {
                sb.append(ARRAY_ELEMENT_SEPARATOR);
            }
            sb.append(array[i]);
        }
        sb.append(ARRAY_END);
        return sb.toString();
    }
}
public static boolean nullSafeEquals ( Object o1 , Object o2 ) { if ( o1 == o2 ) { return true ; } if ( o1 == null || o2 == null ) { return false ; } if ( o1 . equals ( o2 ) ) { return true ; } if ( o1 . getClass ( ) . isArray ( ) && o2 . getClass ( ) . isArray ( ) ) { if ( o1 instanceof Object [ ] && o2 instanceof Object [ ] ) { return Arrays . equals ( ( Object [ ] ) o1 , ( Object [ ] ) o2 ) ; } if ( o1 instanceof boolean [ ] && o2 instanceof boolean [ ] ) { return Arrays . equals ( ( boolean [ ] ) o1 , ( boolean [ ] ) o2 ) ; } if ( o1 instanceof byte [ ] && o2 instanceof byte [ ] ) { return Arrays . equals ( ( byte [ ] ) o1 , ( byte [ ] ) o2 ) ; } if ( o1 instanceof char [ ] && o2 instanceof char [ ] ) { return Arrays . equals ( ( char [ ] ) o1 , ( char [ ] ) o2 ) ; } if ( o1 instanceof double [ ] && o2 instanceof double [ ] ) { return Arrays . equals ( ( double [ ] ) o1 , ( double [ ] ) o2 ) ; } if ( o1 instanceof float [ ] && o2 instanceof float [ ] ) { return Arrays . equals ( ( float [ ] ) o1 , ( float [ ] ) o2 ) ; } if ( o1 instanceof int [ ] && o2 instanceof int [ ] ) { return Arrays . equals ( ( int [ ] ) o1 , ( int [ ] ) o2 ) ; } if ( o1 instanceof long [ ] && o2 instanceof long [ ] ) { return Arrays . equals ( ( long [ ] ) o1 , ( long [ ] ) o2 ) ; } if ( o1 instanceof short [ ] && o2 instanceof short [ ] ) { return Arrays . equals ( ( short [ ] ) o1 , ( short [ ] ) o2 ) ; } } return false ; } public static int nullSafeHashCode ( Object obj ) { if ( obj == null ) { return 0 ; } if ( obj . getClass ( ) . isArray ( ) ) { if ( obj instanceof Object [ ] ) { return nullSafeHashCode ( ( Object [ ] ) obj ) ; } if ( obj instanceof boolean [ ] ) { return nullSafeHashCode ( ( boolean [ ] ) obj ) ; } if ( obj instanceof byte [ ] ) { return nullSafeHashCode ( ( byte [ ] ) obj ) ; } if ( obj instanceof char [ ] ) { return nullSafeHashCode ( ( char [ ] ) obj ) ; } if ( obj instanceof double [ ] ) { return nullSafeHashCode ( ( double [ ] ) obj ) ; } if ( obj instanceof float [ ] ) { return nullSafeHashCode ( ( float [ ] ) obj ) ; } if ( obj instanceof int [ ] ) { return nullSafeHashCode ( ( int [ ] ) obj ) ; } if ( obj instanceof long [ ] ) { return nullSafeHashCode ( ( long [ ] ) obj ) ; } if ( obj instanceof short [ ] ) { return nullSafeHashCode ( ( short [ ] ) obj ) ; } } return obj . hashCode ( ) ; } public static int nullSafeHashCode ( Object [ ] array ) { if ( array == null ) { return 0 ; } int hash = INITIAL_HASH ; for ( Object element : array ) { hash = MULTIPLIER * hash + nullSafeHashCode ( element ) ; } return hash ; } public static int nullSafeHashCode ( boolean [ ] array ) { if ( array == null ) { return 0 ; } int hash = INITIAL_HASH ; for ( boolean element : array ) { hash = MULTIPLIER * hash + hashCode ( element ) ; } return hash ; } public static int nullSafeHashCode ( byte [ ] array ) { if ( array == null ) { return 0 ; } int hash = INITIAL_HASH ; for ( byte element : array ) { hash = MULTIPLIER * hash + element ; } return hash ; } public static int nullSafeHashCode ( char [ ] array ) { if ( array == null ) { return 0 ; } int hash = INITIAL_HASH ; for ( char element : array ) { hash = MULTIPLIER * hash + element ; } return hash ; } public static int nullSafeHashCode ( double [ ] array ) { if ( array == null ) { return 0 ; } int hash = INITIAL_HASH ; for ( double element : array ) { hash = MULTIPLIER * hash + hashCode ( element ) ; } return hash ; } public static int nullSafeHashCode ( float [ ] array ) { if ( array == null ) { return 0 ; } int hash = INITIAL_HASH ; for ( float element : array ) { hash = MULTIPLIER * hash + hashCode ( element ) ; } return hash ; } public static int nullSafeHashCode ( int [ ] array ) { if ( array == null ) { return 0 ; } int hash = INITIAL_HASH ; for ( int element : array ) { hash = MULTIPLIER * hash + element ; } return hash ; } public static int nullSafeHashCode ( long [ ] array ) { if ( array == null ) { return 0 ; } int hash = INITIAL_HASH ; for ( long element : array ) { hash = MULTIPLIER * hash + hashCode ( element ) ; } return hash ; } public static int nullSafeHashCode ( short [ ] array ) { if ( array == null ) { return 0 ; } int hash = INITIAL_HASH ; for ( short element : array ) { hash = MULTIPLIER * hash + element ; } return hash ; } public static int hashCode ( boolean bool ) { return ( bool ? 1231 : 1237 ) ; } public static int hashCode ( double dbl ) { return hashCode ( Double . doubleToLongBits ( dbl ) ) ; } public static int hashCode ( float flt ) { return Float . floatToIntBits ( flt ) ; } public static int hashCode ( long lng ) { return ( int ) ( lng ^ ( lng > > > 32 ) ) ; } public static String nullSafeToString ( Object obj ) { if ( obj == null ) { return NULL_STRING ; } if ( obj instanceof String ) { return ( String ) obj ; } if ( obj instanceof Object [ ] ) { return nullSafeToString ( ( Object [ ] ) obj ) ; } if ( obj instanceof boolean [ ] ) { return nullSafeToString ( ( boolean [ ] ) obj ) ; } if ( obj instanceof byte [ ] ) { return nullSafeToString ( ( byte [ ] ) obj ) ; } if ( obj instanceof char [ ] ) { return nullSafeToString ( ( char [ ] ) obj ) ; } if ( obj instanceof double [ ] ) { return nullSafeToString ( ( double [ ] ) obj ) ; } if ( obj instanceof float [ ] ) { return nullSafeToString ( ( float [ ] ) obj ) ; } if ( obj instanceof int [ ] ) { return nullSafeToString ( ( int [ ] ) obj ) ; } if ( obj instanceof long [ ] ) { return nullSafeToString ( ( long [ ] ) obj ) ; } if ( obj instanceof short [ ] ) { return nullSafeToString ( ( short [ ] ) obj ) ; } return obj . toString ( ) ; } public static String nullSafeToString ( Object [ ] array ) { if ( array == null ) { return NULL_STRING ; } int length = array . length ; if ( length == 0 ) { return EMPTY_ARRAY ; } StringBuilder sb = new StringBuilder ( ) ; for ( int i = 0 ; i < length ; i ++ ) { if ( i == 0 ) { sb . append ( ARRAY_START ) ; } else { sb . append ( ARRAY_ELEMENT_SEPARATOR ) ; } sb . append ( String . valueOf ( array [ i ] ) ) ; } sb . append ( ARRAY_END ) ; return sb . toString ( ) ; } public static String nullSafeToString ( boolean [ ] array ) { if ( array == null ) { return NULL_STRING ; } int length = array . length ; if ( length == 0 ) { return EMPTY_ARRAY ; } StringBuilder sb = new StringBuilder ( ) ; for ( int i = 0 ; i < length ; i ++ ) { if ( i == 0 ) { sb . append ( ARRAY_START ) ; } else { sb . append ( ARRAY_ELEMENT_SEPARATOR ) ; } sb . append ( array [ i ] ) ; } sb . append ( ARRAY_END ) ; return sb . toString ( ) ; } public static String nullSafeToString ( byte [ ] array ) { if ( array == null ) { return NULL_STRING ; } int length = array . length ; if ( length == 0 ) { return EMPTY_ARRAY ; } StringBuilder sb = new StringBuilder ( ) ; for ( int i = 0 ; i < length ; i ++ ) { if ( i == 0 ) { sb . append ( ARRAY_START ) ; } else { sb . append ( ARRAY_ELEMENT_SEPARATOR ) ; } sb . append ( array [ i ] ) ; } sb . append ( ARRAY_END ) ; return sb . toString ( ) ; } public static String nullSafeToString ( char [ ] array ) { if ( array == null ) { return NULL_STRING ; } int length = array . length ; if ( length == 0 ) { return EMPTY_ARRAY ; } StringBuilder sb = new StringBuilder ( ) ; for ( int i = 0 ; i < length ; i ++ ) { if ( i == 0 ) { sb . append ( ARRAY_START ) ; } else { sb . append ( ARRAY_ELEMENT_SEPARATOR ) ; } sb . append ( "'" ) . append ( array [ i ] ) . append ( "'" ) ; } sb . append ( ARRAY_END ) ; return sb . toString ( ) ; } public static String nullSafeToString ( double [ ] array ) { if ( array == null ) { return NULL_STRING ; } int length = array . length ; if ( length == 0 ) { return EMPTY_ARRAY ; } StringBuilder sb = new StringBuilder ( ) ; for ( int i = 0 ; i < length ; i ++ ) { if ( i == 0 ) { sb . append ( ARRAY_START ) ; } else { sb . append ( ARRAY_ELEMENT_SEPARATOR ) ; } sb . append ( array [ i ] ) ; } sb . append ( ARRAY_END ) ; return sb . toString ( ) ; } public static String nullSafeToString ( float [ ] array ) { if ( array == null ) { return NULL_STRING ; } int length = array . length ; if ( length == 0 ) { return EMPTY_ARRAY ; } StringBuilder sb = new StringBuilder ( ) ; for ( int i = 0 ; i < length ; i ++ ) { if ( i == 0 ) { sb . append ( ARRAY_START ) ; } else { sb . append ( ARRAY_ELEMENT_SEPARATOR ) ; } sb . append ( array [ i ] ) ; } sb . append ( ARRAY_END ) ; return sb . toString ( ) ; } public static String nullSafeToString ( int [ ] array ) { if ( array == null ) { return NULL_STRING ; } int length = array . length ; if ( length == 0 ) { return EMPTY_ARRAY ; } StringBuilder sb = new StringBuilder ( ) ; for ( int i = 0 ; i < length ; i ++ ) { if ( i == 0 ) { sb . append ( ARRAY_START ) ; } else { sb . append ( ARRAY_ELEMENT_SEPARATOR ) ; } sb . append ( array [ i ] ) ; } sb . append ( ARRAY_END ) ; return sb . toString ( ) ; } public static String nullSafeToString ( long [ ] array ) { if ( array == null ) { return NULL_STRING ; } int length = array . length ; if ( length == 0 ) { return EMPTY_ARRAY ; } StringBuilder sb = new StringBuilder ( ) ; for ( int i = 0 ; i < length ; i ++ ) { if ( i == 0 ) { sb . append ( ARRAY_START ) ; } else { sb . append ( ARRAY_ELEMENT_SEPARATOR ) ; } sb . append ( array [ i ] ) ; } sb . append ( ARRAY_END ) ; return sb . toString ( ) ; } public static String nullSafeToString ( short [ ] array ) { if ( array == null ) { return NULL_STRING ; } int length = array . length ; if ( length == 0 ) { return EMPTY_ARRAY ; } StringBuilder sb = new StringBuilder ( ) ; for ( int i = 0 ; i < length ; i ++ ) { if ( i == 0 ) { sb . append ( ARRAY_START ) ; } else { sb . append ( ARRAY_ELEMENT_SEPARATOR ) ; } sb . append ( array [ i ] ) ; } sb . append ( ARRAY_END ) ; return sb . toString ( ) ; } }
Determine if the given objects are equal, returning {@code true} if both are {@code null} or
{@code false} if only one is {@code null}. <p>Compares arrays with {@code Arrays.equals},
performing an equality check based on the array elements rather than the array reference.

@param o1 first Object to compare
@param o2 second Object to compare
@return whether the given objects are equal
@see java.util.Arrays#equals