输入某年某月某日，判断这一天是这一年的第几天代码,Java代码库,德仔网

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【Java】输入某年某月某日，判断这一天是这一年的第几天
作者:Dezai.CN / 发布于2011/3/25/ 480
程序分析：以3月5日为例，应该先把前两个月的加起来，然后再加上5天即本年的第几天，特殊情况，闰年且输入月份大于3时需考虑多加一天。
<div><span style="color: #0000ff">import</span><span style="color: #000000"> java.util.</span><span style="color: #000000">*</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"> test {
 </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: #0000ff">int</span><span style="color: #000000"> day</span><span style="color: #000000">=</span><span style="color: #000000">0</span><span style="color: #000000">;
 </span><span style="color: #0000ff">int</span><span style="color: #000000"> month</span><span style="color: #000000">=</span><span style="color: #000000">0</span><span style="color: #000000">;
 </span><span style="color: #0000ff">int</span><span style="color: #000000"> year</span><span style="color: #000000">=</span><span style="color: #000000">0</span><span style="color: #000000">;
 </span><span style="color: #0000ff">int</span><span style="color: #000000"> sum</span><span style="color: #000000">=</span><span style="color: #000000">0</span><span style="color: #000000">;
 </span><span style="color: #0000ff">int</span><span style="color: #000000"> leap; 
 System.out.print(</span><span style="color: #000000">"</span><span style="color: #000000">请输入年,月,日\n</span><span style="color: #000000">"</span><span style="color: #000000">); 
 Scanner input </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #0000ff">new</span><span style="color: #000000"> Scanner(System.in);
 year</span><span style="color: #000000">=</span><span style="color: #000000">input.nextInt();
 month</span><span style="color: #000000">=</span><span style="color: #000000">input.nextInt();
 day</span><span style="color: #000000">=</span><span style="color: #000000">input.nextInt();
 </span><span style="color: #0000ff">switch</span><span style="color: #000000">(month) </span><span style="color: #008000">/*</span><span style="color: #008000">先计算某月以前月份的总天数</span><span style="color: #008000">*/</span><span style="color: #000000"> 
 { 
 </span><span style="color: #0000ff">case</span><span style="color: #000000"> </span><span style="color: #000000">1</span><span style="color: #000000">:
 sum</span><span style="color: #000000">=</span><span style="color: #000000">0</span><span style="color: #000000">;</span><span style="color: #0000ff">break</span><span style="color: #000000">; 
 </span><span style="color: #0000ff">case</span><span style="color: #000000"> </span><span style="color: #000000">2</span><span style="color: #000000">:
 sum</span><span style="color: #000000">=</span><span style="color: #000000">31</span><span style="color: #000000">;</span><span style="color: #0000ff">break</span><span style="color: #000000">; 
 </span><span style="color: #0000ff">case</span><span style="color: #000000"> </span><span style="color: #000000">3</span><span style="color: #000000">:
 sum</span><span style="color: #000000">=</span><span style="color: #000000">59</span><span style="color: #000000">;</span><span style="color: #0000ff">break</span><span style="color: #000000">; 
 </span><span style="color: #0000ff">case</span><span style="color: #000000"> </span><span style="color: #000000">4</span><span style="color: #000000">:
 sum</span><span style="color: #000000">=</span><span style="color: #000000">90</span><span style="color: #000000">;</span><span style="color: #0000ff">break</span><span style="color: #000000">; 
 </span><span style="color: #0000ff">case</span><span style="color: #000000"> </span><span style="color: #000000">5</span><span style="color: #000000">:
 sum</span><span style="color: #000000">=</span><span style="color: #000000">120</span><span style="color: #000000">;</span><span style="color: #0000ff">break</span><span style="color: #000000">; 
 </span><span style="color: #0000ff">case</span><span style="color: #000000"> </span><span style="color: #000000">6</span><span style="color: #000000">:
 sum</span><span style="color: #000000">=</span><span style="color: #000000">151</span><span style="color: #000000">;</span><span style="color: #0000ff">break</span><span style="color: #000000">; 
 </span><span style="color: #0000ff">case</span><span style="color: #000000"> </span><span style="color: #000000">7</span><span style="color: #000000">:
 sum</span><span style="color: #000000">=</span><span style="color: #000000">181</span><span style="color: #000000">;</span><span style="color: #0000ff">break</span><span style="color: #000000">; 
 </span><span style="color: #0000ff">case</span><span style="color: #000000"> </span><span style="color: #000000">8</span><span style="color: #000000">:
 sum</span><span style="color: #000000">=</span><span style="color: #000000">212</span><span style="color: #000000">;</span><span style="color: #0000ff">break</span><span style="color: #000000">; 
 </span><span style="color: #0000ff">case</span><span style="color: #000000"> </span><span style="color: #000000">9</span><span style="color: #000000">:
 sum</span><span style="color: #000000">=</span><span style="color: #000000">243</span><span style="color: #000000">;</span><span style="color: #0000ff">break</span><span style="color: #000000">; 
 </span><span style="color: #0000ff">case</span><span style="color: #000000"> </span><span style="color: #000000">10</span><span style="color: #000000">:
 sum</span><span style="color: #000000">=</span><span style="color: #000000">273</span><span style="color: #000000">;</span><span style="color: #0000ff">break</span><span style="color: #000000">; 
 </span><span style="color: #0000ff">case</span><span style="color: #000000"> </span><span style="color: #000000">11</span><span style="color: #000000">:
 sum</span><span style="color: #000000">=</span><span style="color: #000000">304</span><span style="color: #000000">;</span><span style="color: #0000ff">break</span><span style="color: #000000">; 
 </span><span style="color: #0000ff">case</span><span style="color: #000000"> </span><span style="color: #000000">12</span><span style="color: #000000">:
 sum</span><span style="color: #000000">=</span><span style="color: #000000">334</span><span style="color: #000000">;</span><span style="color: #0000ff">break</span><span style="color: #000000">; 
 </span><span style="color: #0000ff">default</span><span style="color: #000000">:
 System.out.println(</span><span style="color: #000000">"</span><span style="color: #000000">data error</span><span style="color: #000000">"</span><span style="color: #000000">);</span><span style="color: #0000ff">break</span><span style="color: #000000">;
 } 
 sum</span><span style="color: #000000">=</span><span style="color: #000000">sum</span><span style="color: #000000">+</span><span style="color: #000000">day; </span><span style="color: #008000">/*</span><span style="color: #008000">再加上某天的天数</span><span style="color: #008000">*/</span><span style="color: #000000"> 
 </span><span style="color: #0000ff">if</span><span style="color: #000000">(year</span><span style="color: #000000">%</span><span style="color: #000000">400</span><span style="color: #000000">==</span><span style="color: #000000">0</span><span style="color: #000000">||</span><span style="color: #000000">(year</span><span style="color: #000000">%</span><span style="color: #000000">4</span><span style="color: #000000">==</span><span style="color: #000000">0</span><span style="color: #000000">&&</span><span style="color: #000000">year</span><span style="color: #000000">%</span><span style="color: #000000">100</span><span style="color: #000000">!=</span><span style="color: #000000">0</span><span style="color: #000000">))</span><span style="color: #008000">/*</span><span style="color: #008000">判断是不是闰年</span><span style="color: #008000">*/</span><span style="color: #000000"> 
 leap</span><span style="color: #000000">=</span><span style="color: #000000">1</span><span style="color: #000000">; 
 </span><span style="color: #0000ff">else</span><span style="color: #000000"> 
 leap</span><span style="color: #000000">=</span><span style="color: #000000">0</span><span style="color: #000000">; 
 </span><span style="color: #0000ff">if</span><span style="color: #000000">(leap</span><span style="color: #000000">==</span><span style="color: #000000">1</span><span style="color: #000000"> </span><span style="color: #000000">&&</span><span style="color: #000000"> month</span><span style="color: #000000">></span><span style="color: #000000">2</span><span style="color: #000000">)</span><span style="color: #008000">/*</span><span style="color: #008000">如果是闰年且月份大于2,总天数应该加一天</span><span style="color: #008000">*/</span><span style="color: #000000"> 
 sum</span><span style="color: #000000">++</span><span style="color: #000000">; 
 System.out.println(</span><span style="color: #000000">"</span><span style="color: #000000">It is the the day:</span><span style="color: #000000">"</span><span style="color: #000000">+</span><span style="color: #000000">sum);
 }
}
</span></div>
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　第几天　
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