Short

基本常量定义

    public static final short   MIN_VALUE = -32768;

    public static final short   MAX_VALUE = 32767;

    @SuppressWarnings("unchecked")
    public static final Class<Short>    TYPE = (Class<Short>) Class.getPrimitiveClass("short");

    public static final int SIZE = 16;

    public static final int BYTES = SIZE / Byte.SIZE;

构造器创建Short对象

    public Short(short value) {
        this.value = value;
    }
    public Short(String s) throws NumberFormatException {
        this.value = parseShort(s, 10);
    }

valueOf创建Short对象

    public static Short valueOf(String s, int radix)
        throws NumberFormatException {
        return valueOf(parseShort(s, radix));
    }
    public static Short valueOf(String s) throws NumberFormatException {
        return valueOf(s, 10);
    }
    public static Short valueOf(short s) {
        final int offset = 128;
        int sAsInt = s;
        if (sAsInt >= -128 && sAsInt <= 127) { // must cache
            return ShortCache.cache[sAsInt + offset];
        }
        return new Short(s);
    }

字符串转short

    public static short parseShort(String s, int radix)
        throws NumberFormatException {
        int i = Integer.parseInt(s, radix);
        if (i < MIN_VALUE || i > MAX_VALUE)
            throw new NumberFormatException(
                "Value out of range. Value:\"" + s + "\" Radix:" + radix);
        return (short)i;
    }

    public static short parseShort(String s) throws NumberFormatException {
        return parseShort(s, 10);
    }

short转字符串

    public String toString() {
        return Integer.toString((int)value);
    }

    public static String toString(short s) {
        return Integer.toString((int)s, 10);
    }

继承Number类,数值之间转换

public byte byteValue() {
    return (byte)value;
}

public short shortValue() {
    return (short)value;
}

public int intValue() {
    return (int)value;
}

public long longValue() {
    return (long)value;
}

public float floatValue() {
    return (float)value;
}

public double doubleValue() {
    return value;
}

hashCode/equals/compare

    @Override
    public int hashCode() {
        return Short.hashCode(value);
    }

    public static int hashCode(short value) {
        return (int)value;
    }

    public boolean equals(Object obj) {
        if (obj instanceof Short) {
            return value == ((Short)obj).shortValue();
        }
        return false;
    }

其他方法

    public static Short decode(String nm) throws NumberFormatException {
        int i = Integer.decode(nm);
        if (i < MIN_VALUE || i > MAX_VALUE)
            throw new NumberFormatException(
                    "Value " + i + " out of range from input " + nm);
        return valueOf((short)i);
    }

    public static short reverseBytes(short i) {
        return (short) (((i & 0xFF00) >> 8) | (i << 8));
    }

    public static int toUnsignedInt(short x) {
        return ((int) x) & 0xffff;
    }

    public static long toUnsignedLong(short x) {
        return ((long) x) & 0xffffL;
    }

缓存

    private static class ShortCache {
        private ShortCache(){}

        static final Short cache[] = new Short[-(-128) + 127 + 1];

        static {
            for(int i = 0; i < cache.length; i++)
                cache[i] = new Short((short)(i - 128));
        }
    }