Java 基础类型 —— Short

痛定思痛。 2023-05-29 13:19 3阅读 0赞

### 文章目录 ###

*   *  1 Short 类方法
     *   *  1.1 toString —— 将 Short 转为 String
         *  1.2 parseShort —— 将 String 转为 short
         *  1.3 valueOf —— 将 String、short 转为 Short
         *  1.4 hashcode/compare/reverseBytes
         *  1.5 toUnsignedInt/toUnsignedLong
         *  1.6 构造函数 Short(String)
     *  参考

## 1 Short 类方法 ##

*  返回类型标 \* 的是重点方法

### 1.1 toString —— 将 Short 转为 String ###

<table> 
 <thead> 
  <tr> 
   <th>返回类型</th> 
   <th>方法名</th> 
   <th>描述</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>static String</td> 
   <td>toString(short s)</td> 
   <td>Integer.toString((int)s, 10)</td> 
  </tr> 
  <tr> 
   <td>String</td> 
   <td>toString()</td> 
   <td>Integer.toString((int)value)</td> 
  </tr> 
 </tbody> 
</table>

### 1.2 parseShort —— 将 String 转为 short ###

<table> 
 <thead> 
  <tr> 
   <th>返回类型</th> 
   <th>方法名</th> 
   <th>描述</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>static short</td> 
   <td>parseShort(String s)</td> 
   <td>parseShort(s, 10)</td> 
  </tr> 
  <tr> 
   <td>static short</td> 
   <td>parseShort(String s, int radix)</td> 
   <td>Integer.parseInt(s, radix)，如果返回的 int 值 不在 short 的范围内，则报错</td> 
  </tr> 
 </tbody> 
</table>

### 1.3 valueOf —— 将 String、short 转为 Short ###

<table> 
 <thead> 
  <tr> 
   <th>返回类型</th> 
   <th>方法名</th> 
   <th>描述</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>static Short</td> 
   <td>valueOf(String s)</td> 
   <td>valueOf(s, 10)</td> 
  </tr> 
  <tr> 
   <td>static Short</td> 
   <td>valueOf(String s, int radix)</td> 
   <td>valueOf(parseShort(s, radix))</td> 
  </tr> 
  <tr> 
   <td>static Short</td> 
   <td>valueOf(short s)</td> 
   <td>在 [-128,127] 之内走 cache</td> 
  </tr> 
 </tbody> 
</table>

### 1.4 hashcode/compare/reverseBytes ###

<table> 
 <thead> 
  <tr> 
   <th>返回类型</th> 
   <th>方法名</th> 
   <th>描述</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>int</td> 
   <td>hashCode()</td> 
   <td>Short.hashCode(value)</td> 
  </tr> 
  <tr> 
   <td>static int</td> 
   <td>hashCode(short value)</td> 
   <td>(int)value</td> 
  </tr> 
  <tr> 
   <td>int</td> 
   <td>compareTo(Short anotherShort)</td> 
   <td>compare(this.value, anotherShort.value)</td> 
  </tr> 
  <tr> 
   <td>static int</td> 
   <td>compare(short x, short y)</td> 
   <td>x - y，这个返回的不是固定的 -1,0,1</td> 
  </tr> 
  <tr> 
   <td>static short</td> 
   <td>reverseBytes(short i)</td> 
   <td>(short) (((i &amp; 0xFF00) &gt;&gt; 8) | (i &lt;&lt; 8))</td> 
  </tr> 
 </tbody> 
</table>

### 1.5 toUnsignedInt/toUnsignedLong ###

<table> 
 <thead> 
  <tr> 
   <th>返回类型</th> 
   <th>方法名</th> 
   <th>描述</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>static int</td> 
   <td>toUnsignedInt(short x)</td> 
   <td>((int) x) &amp; 0xffff</td> 
  </tr> 
  <tr> 
   <td>static long</td> 
   <td>toUnsignedLong(short x)</td> 
   <td>((long) x) &amp; 0xffffL</td> 
  </tr> 
 </tbody> 
</table>

### 1.6 构造函数 Short(String) ###

*  内部调用 parseShort(s,10)
 *  如果确定 int 很小，推荐使用 Short.valueOf(String)：这样可以走 cache

## 参考 ##

jdk1.8\_171