源码看JAVA【九】Long

1、最大值最小值

     /**
     * A constant holding the minimum value a {@code long} can
     * have, -2<sup>63</sup>.
     */
    @Native public static final long MIN_VALUE = 0x8000000000000000L;

    /**
     * A constant holding the maximum value a {@code long} can
     * have, 2<sup>63</sup>-1.
     */
    @Native public static final long MAX_VALUE = 0x7fffffffffffffffL;

2、stringSize：乘法判断位数，Long比Integer大很多，定义数组比较长

     static int stringSize(long x) {
        long p = 10;
        for (int i=1; i<19; i++) {
            if (x < p)
                return i;
            p = 10*p;
        }
        return 19;
    }

3、LongCache

-128~127的缓存。

     private static class LongCache {
        private LongCache(){}

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

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

    /**
     * Returns a {@code Long} instance representing the specified
     * {@code long} value.
     * If a new {@code Long} instance is not required, this method
     * should generally be used in preference to the constructor
     * {@link #Long(long)}, as this method is likely to yield
     * significantly better space and time performance by caching
     * frequently requested values.
     *
     * Note that unlike the {@linkplain Integer#valueOf(int)
     * corresponding method} in the {@code Integer} class, this method
     * is <em>not</em> required to cache values within a particular
     * range.
     *
     * @param  l a long value.
     * @return a {@code Long} instance representing {@code l}.
     * @since  1.5
     */
    public static Long valueOf(long l) {
        final int offset = 128;
        if (l >= -128 && l <= 127) { // will cache
            return LongCache.cache[(int)l + offset];
        }
        return new Long(l);
    }

4、hashCode

返回前32位与后32位的异或值

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

    /**
     * Returns a hash code for a {@code long} value; compatible with
     * {@code Long.hashCode()}.
     *
     * @param value the value to hash
     * @return a hash code value for a {@code long} value.
     * @since 1.8
     */
    public static int hashCode(long value) {
        return (int)(value ^ (value >>> 32));
    }

5、equals

值的比较

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

6、其余功能与Integer类似