Java 基础类型 —— Boolean

缺乏、安全感 2023-05-29 13:19 4阅读 0赞

### 文章目录 ###

*   *  1 Boolean 类方法
     *   *  1.1 toString —— 将 boolean 转为 String
         *  1.2 parseBoolean—— 将 String 转为 boolean
         *  1.3 valueOf —— 将 String、boolean 转为 Boolean
         *  1.4 hashcode/compare
         *  1.5 logicalAnd/logicalOr/logicalXor
         *  1.6 构造函数 Boolean(boolean)/Boolean(String)
     *  参考

## 1 Boolean 类方法 ##

*  返回类型标 \* 的是重点方法

### 1.1 toString —— 将 boolean 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(boolean b)</td> 
   <td>b ? “true” : “false”</td> 
  </tr> 
  <tr> 
   <td>String</td> 
   <td>toString()</td> 
   <td>value ? “true” : “false”</td> 
  </tr> 
 </tbody> 
</table>

### 1.2 parseBoolean—— 将 String 转为 boolean ###

<table> 
 <thead> 
  <tr> 
   <th>返回类型</th> 
   <th>方法名</th> 
   <th>描述</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>static boolean</td> 
   <td>parseBoolean(String s)</td> 
   <td>((s != null) &amp;&amp; s.equalsIgnoreCase(“true”))</td> 
  </tr> 
 </tbody> 
</table>

### 1.3 valueOf —— 将 String、boolean 转为 Boolean ###

<table> 
 <thead> 
  <tr> 
   <th>返回类型</th> 
   <th>方法名</th> 
   <th>描述</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>static Boolean</td> 
   <td>valueOf(String s)</td> 
   <td>parseBoolean(s) ? TRUE : FALSE</td> 
  </tr> 
  <tr> 
   <td>static Boolean</td> 
   <td>valueOf(boolean b)</td> 
   <td>b ? TRUE : FALSE</td> 
  </tr> 
 </tbody> 
</table>

### 1.4 hashcode/compare ###

<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>Boolean.hashCode(value)</td> 
  </tr> 
  <tr> 
   <td>static int</td> 
   <td>hashCode(boolean value)</td> 
   <td>value ? 1231 : 1237</td> 
  </tr> 
  <tr> 
   <td>int</td> 
   <td>compareTo(Boolean b)</td> 
   <td>compare(this.value, b.value)</td> 
  </tr> 
  <tr> 
   <td>static int</td> 
   <td>compare(short x, short y)</td> 
   <td>(x == y) ? 0 : (x ? 1 : -1)</td> 
  </tr> 
 </tbody> 
</table>

### 1.5 logicalAnd/logicalOr/logicalXor ###

<table> 
 <thead> 
  <tr> 
   <th>返回类型</th> 
   <th>方法名</th> 
   <th>描述</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>static boolean</td> 
   <td>logicalAnd(boolean a, boolean b)</td> 
   <td>a &amp;&amp; b</td> 
  </tr> 
  <tr> 
   <td>static boolean</td> 
   <td>logicalOr(boolean a, boolean b)</td> 
   <td>a || b</td> 
  </tr> 
  <tr> 
   <td>static boolean</td> 
   <td>logicalXor(boolean a, boolean b)</td> 
   <td>a ^ b</td> 
  </tr> 
 </tbody> 
</table>

### 1.6 构造函数 Boolean(boolean)/Boolean(String) ###

*  内部调用 parseBoolean(s)
 *  **推荐使用 valueOf() 方法创建 Boolean 对象**

## 参考 ##

jdk1.8\_171