原始浮点类型的相等性比较代码,Java代码库,德仔网

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【Java】原始浮点类型的相等性比较
作者:Dezai.CN / 发布于2011/12/1/ 511
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<pre><span style="color: #008080"> 1</span> <span style="color: #000000">    </span><span style="color: #0000ff">public</span><span style="color: #000000"> </span><span style="color: #0000ff">class</span><span style="color: #000000"> MyTest {</span><span style="color: #008080"> 2</span> <span style="color: #000000">        </span><span style="color: #0000ff">public</span><span style="color: #000000"> </span><span style="color: #0000ff">static</span><span style="color: #000000"> </span><span style="color: #0000ff">boolean</span><span style="color: #000000"> equals(</span><span style="color: #0000ff">double</span><span style="color: #000000"> v1,</span><span style="color: #0000ff">double</span><span style="color: #000000"> v2) {</span><span style="color: #008080"> 3</span> <span style="color: #000000">            </span><span style="color: #0000ff">return</span><span style="color: #000000"> Math.abs(v1 </span><span style="color: #000000">-</span><span style="color: #000000"> v2) </span><span style="color: #000000"><</span><span style="color: #000000"> </span><span style="color: #000000">1.0E-10</span><span style="color: #000000">;</span><span style="color: #008080"> 4</span> <span style="color: #000000">        }</span><span style="color: #008080"> 5</span> <span style="color: #000000">    </span><span style="color: #008080"> 6</span> <span style="color: #000000">        </span><span style="color: #0000ff">public</span><span style="color: #000000"> </span><span style="color: #0000ff">static</span><span style="color: #000000"> </span><span style="color: #0000ff">void</span><span style="color: #000000"> main(String args[]) {</span><span style="color: #008080"> 7</span> <span style="color: #000000">            </span><span style="color: #0000ff">double</span><span style="color: #000000"> a </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #000000">9.33333333333000</span><span style="color: #000000">;</span><span style="color: #008080"> 8</span> <span style="color: #000000">            </span><span style="color: #0000ff">double</span><span style="color: #000000"> b </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #000000">9.33333333333333</span><span style="color: #000000">;</span><span style="color: #008080"> 9</span> <span style="color: #000000">            </span><span style="color: #008080">10</span> <span style="color: #000000">            </span><span style="color: #0000ff">if</span><span style="color: #000000"> (equals(a, b))</span><span style="color: #008080">11</span> <span style="color: #000000">                System.out.println(</span><span style="color: #000000">"</span><span style="color: #000000">double values are equal</span><span style="color: #000000">"</span><span style="color: #000000">);</span><span style="color: #008080">12</span> <span style="color: #000000">            </span><span style="color: #0000ff">else</span><span style="color: #000000"></span><span style="color: #008080">13</span> <span style="color: #000000">                System.out.println(</span><span style="color: #000000">"</span><span style="color: #000000">double values are not equal</span><span style="color: #000000">"</span><span style="color: #000000">);</span><span style="color: #008080">14</span> <span style="color: #000000">            </span><span style="color: #008080">15</span> <span style="color: #000000">            Double da </span><span style="color: #000000">=</span><span style="color: #000000"> a;</span><span style="color: #008080">16</span> <span style="color: #000000">            Double db </span><span style="color: #000000">=</span><span style="color: #000000"> b;</span><span style="color: #008080">17</span> <span style="color: #000000">            </span><span style="color: #0000ff">if</span><span style="color: #000000"> (da.equals(b))</span><span style="color: #008080">18</span> <span style="color: #000000">                System.out.println(</span><span style="color: #000000">"</span><span style="color: #000000">Double values are equal</span><span style="color: #000000">"</span><span style="color: #000000">);</span><span style="color: #008080">19</span> <span style="color: #000000">            </span><span style="color: #0000ff">else</span><span style="color: #000000"></span><span style="color: #008080">20</span> <span style="color: #000000">                System.out.println(</span><span style="color: #000000">"</span><span style="color: #000000">Double values are not equal</span><span style="color: #000000">"</span><span style="color: #000000">);</span><span style="color: #008080">21</span> <span style="color: #000000">                </span><span style="color: #008080">22</span> <span style="color: #000000">        }</span><span style="color: #008080">23</span> <span style="color: #000000">    }</span><span style="color: #008080">24</span> <span style="color: #000000">    </span><span style="color: #008000">/*</span><span style="color: #008000">    输出结果如下：</span><span style="color: #008080">25</span> <span style="color: #008000">        double values are equal</span><span style="color: #008080">26</span> <span style="color: #008000">        Double values are not equal    </span><span style="color: #008080">27</span> <span style="color: #008000">    </span><span style="color: #008000">*/</span></pre>
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