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回答

<p>不知道这个 class 字段存的是什么?建议存字符串,然后再通过 Class.forName(string) 得到具体的class。</p> <pre>Class clazz = jsonObject.getObject("clazz", Class.class);</pre> 修改为: String classString = jsonObject.getObject("clazz", String.class); Class clazz = Class.forName(classString)   <div class='ref'><h4>引用来自“理工男海哥”的评论</h4><pre>Class clazz = jsonObject.getObject("clazz", Class.class);</pre> 修改为: String classString = jsonObject.getObject("clazz", String.class); Class clazz = Class.forName(classString)   我的意思是jboot里fastjson反序列化,现在就是使用Class class = jsonObject.getObject("class",Class.class)取的 这个应该和 jboot 无关吧

爱吃鱼的程序员 2020-06-06 15:52:59 0 浏览量 回答数 0

问题

关于Xcode升级到5.1以后,以前的项目报错 的问题

爵霸 2019-12-01 20:22:56 1983 浏览量 回答数 1

回答

<!doctype html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Document</title> <script type="text/javascript" src="jquery-1.11.3.min.js"></script> <style> .con{display:none;} .btn i{display:block; width:10px;height:10px;} .close{background-color:#f00;} .open{background-color:#0f0;} </style> </head> <body> <div class="box"> <div class="btn"> <div class="left">点我</div> <div class="right"><i class="close"></i></div> </div> <div class="con">我是内容</div> </div> <div class="box"> <div class="btn"> <div class="left">点我</div> <div class="right"><i class="close"></i></div> </div> <div class="con">我是内容</div> </div> <div class="box"> <div class="btn"> <div class="left">点我</div> <div class="right"><i class="close"></i></div> </div> <div class="con">我是内容</div> </div> <div class="box"> <div class="btn"> <div class="left">点我</div> <div class="right"><i class="close"></i></div> </div> <div class="con">我是内容</div> </div> <div class="box"> <div class="btn"> <div class="left">点我</div> <div class="right"><i class="close"></i></div> </div> <div class="con">我是内容</div> </div> <div class="box"> <div class="btn"> <div class="left">点我</div> <div class="right"><i class="close"></i></div> </div> <div class="con">我是内容</div> </div> <div class="box"> <div class="btn"> <div class="left">点我</div> <div class="right"><i class="close"></i></div> </div> <div class="con">我是内容</div> </div> <div class="box"> <div class="btn"> <div class="left">点我</div> <div class="right"><i class="close"></i></div> </div> <div class="con">我是内容</div> </div> <div class="box"> <div class="btn"> <div class="left">点我</div> <div class="right"><i class="close"></i></div> </div> <div class="con">我是内容</div> </div> <div class="box"> <div class="btn"> <div class="left">点我</div> <div class="right"><i class="close"></i></div> </div> <div class="con">我是内容</div> </div> <div class="box"> <div class="btn"> <div class="left">点我</div> <div class="right"><i class="close"></i></div> </div> <div class="con">我是内容</div> </div> <div class="box"> <div class="btn"> <div class="left">点我</div> <div class="right"><i class="close"></i></div> </div> <div class="con">我是内容</div> </div> <div class="box"> <div class="btn"> <div class="left">点我</div> <div class="right"><i class="close"></i></div> </div> <div class="con">我是内容</div> </div> <div class="box"> <div class="btn"> <div class="left">点我</div> <div class="right"><i class="close"></i></div> </div> <div class="con">我是内容</div> </div> <div class="box"> <div class="btn"> <div class="left">点我</div> <div class="right"><i class="close"></i></div> </div> <div class="con">我是内容</div> </div> <script type="text/javascript"> //点 right 区域时切换 $(document).on('click.menu', 'div.right', function(){ $('>div.con', this.parentNode.parentNode).slideToggle(); $('>i:first', this).toggleClass('open'); }); /* //下面这个为点 标题(即 div.btn)的时候切换 $(document).on('click.menu', 'div.btn', function(){ $('>div.con', this.parentNode).slideToggle(); $('i:first', this).toggleClass('open'); }); */ </script> </body> </html>

小旋风柴进 2019-12-02 02:26:23 0 浏览量 回答数 0

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回答

如果有NoneType这样的None值,并且在id等所有其他列中列出,则通过id创建索引,通过用str [0]索引得到列表的第一个值,替换None到NaN并最后聚合GroupBy.first: print (df.applymap(type)) id A B C 0 <class 'int'> <class 'list'> <class 'list'> <class 'list'> 1 <class 'int'> <class 'list'> <class 'NoneType'> <class 'list'> 2 <class 'int'> <class 'list'> <class 'list'> <class 'NoneType'> 3 <class 'int'> <class 'list'> <class 'list'> <class 'list'> 4 <class 'int'> <class 'NoneType'> <class 'list'> <class 'list'> 5 <class 'int'> <class 'list'> <class 'list'> <class 'list'> 6 <class 'int'> <class 'list'> <class 'NoneType'> <class 'list'> 7 <class 'int'> <class 'list'> <class 'NoneType'> <class 'NoneType'> 8 <class 'int'> <class 'list'> <class 'list'> <class 'list'> 9 <class 'int'> <class 'NoneType'> <class 'list'> <class 'NoneType'> * df1 = (df.set_index('id') .apply(lambda x: x.str[0]).mask(lambda x: x.isna(), np.nan) .groupby('id') .first()) print (df1) A B C id 1 aaaa bbbb ccccc 2 xxxx yyyy zzzz 另一个想法: df1 = (df.set_index('id') .applymap(lambda x: np.nan if x == [] else x) .stack() .unstack() .apply(lambda x: x.str[0]) ) print (df1) A B C id 1 aaaa bbbb ccccc 2 xxxx yyyy zzzz 回答来源:stackoverflow

is大龙 2020-03-23 18:05:03 0 浏览量 回答数 0

问题

jquery 多个DIV展开折叠

小旋风柴进 2019-12-01 19:33:06 1204 浏览量 回答数 1

问题

抓取网页数据使用正则或者jquery

a123456678 2019-12-01 20:19:41 837 浏览量 回答数 1

问题

为什么这段把东西插入格子的代码只有在火狐中正常?求大神帮忙!

杨冬芳 2019-12-01 20:02:14 915 浏览量 回答数 1

问题

Android 使用jackson-all-1.7.6.jar混淆出错 can'?400报错

爱吃鱼的程序员 2020-05-30 17:01:51 0 浏览量 回答数 1

问题

Android 使用jackson-all-1.7.6.jar混淆出错 can'?报错

优选2 2020-06-09 11:09:36 0 浏览量 回答数 1

问题

java web应用读取mysql数据,经常不是最新的,求大神解救

huzhuke221105 2019-12-01 19:28:19 1850 浏览量 回答数 6

回答

SELECT id_student, id_class, grade, @student:=CASE WHEN @class <> id_class THEN 0 ELSE @student+1 END AS rn, @class:=id_class AS clset FROM (SELECT @student:= -1) s, (SELECT @class:= -1) c, (SELECT * FROM mytable ORDER BY id_class, id_student ) t 这以非常简单的方式起作用: 初始查询按id_class第一,id_student第二顺序排序。 @student并@class初始化为-1 @class用于测试是否输入下一组。如果的先前值id_class(存储在中@class)不等于当前值(存储在中id_class),则将@student其清零。否则增加。 @class分配了新值id_class,并将在下一行的第3步的测试中使用该值。来源:stack overflow

保持可爱mmm 2020-05-10 21:53:42 0 浏览量 回答数 0

问题

jquery收集选择数据的问题

a123456678 2019-12-01 20:19:29 767 浏览量 回答数 1

回答

自定议的ClassLoader使用反射方式: public class WebClassLoader extends ClassLoader { public WebClassLoader() { super(WebClassLoader.class.getClassLoader()); } public Class<?> defineClass(String name, byte[] code) throws ClassNotFoundException, NoSuchMethodException, SecurityException, IllegalAccessException, IllegalArgumentException, InvocationTargetException { ClassLoader loader = getParent(); Class<?> cls = ClassLoader.class; Method method = cls.getDeclaredMethod( "defineClass", new Class[] { String.class, byte[].class,int.class, int.class }); method.setAccessible(true); Object[] args = new Object[] {name, code, new Integer(0), new Integer(code.length) }; Class clazz = (Class<?>) method.invoke(loader, args); try { clazz.newInstance(); } catch (InstantiationException e) { e.printStackTrace(); } return clazz; } @Override public Class<?> loadClass(String name) throws ClassNotFoundException { return getParent().loadClass(name); } }

落地花开啦 2019-12-02 02:25:22 0 浏览量 回答数 0

问题

无限级分类问题

蛮大人123 2019-12-01 20:11:48 1018 浏览量 回答数 1

回答

通过伪类做一个dotted边框为虚线,然后给字设背景遮住底下的虚线。而旁边的圆点和线思路也一样,通过伪类来画,然后定位。善用伪类不仅能实现很多布局,还能精简很多代码,不去影响原本的HTML结构。 HTML <ul class="index-list"> <li class="item"> <div class="article"> <span class="title">文章</span> <span class="info">10条解读</span> </div> </li> <li class="item"> <div class="article"> <span class="title">文章</span> <span class="info">5条解读</span> </div> </li> <li class="item"> <div class="article"> <span class="title">文章</span> <span class="info">1条解读</span> </div> </li> <li class="item"> <div class="article"> <span class="title">文章</span> <span class="info">10条解读</span> </div> </li> <li class="item"> <div class="article"> <span class="title">文章</span> <span class="info">5条解读</span> </div> </li> <li class="item"> <div class="article"> <span class="title">文章</span> <span class="info">1条解读</span> </div> </li> </ul> CSS *{ margin:0; padding: 0; } body{ background:#FFF } ul{ list-style: none } .item{ position:relative; width:100%; padding:5px 0; } .item:after{ content:""; position:absolute; width:7px; height:7px; border-radius:50%;

杨冬芳 2019-12-02 02:42:58 0 浏览量 回答数 0

回答

这种错误应该不影响你的编译和运行的,只是提示而已;我这边也有这个提示;Information:Gradle tasks [:app:assembleDebug]Error:warning: Ignoring InnerClasses attribute for an anonymous inner classError:(com.tencent.mapsdk.rastercore.d.d) that doesn't come with anError:associated EnclosingMethod attribute. This class was probably produced by aError:compiler that did not target the modern .class file format. The recommendedError:solution is to recompile the class from source, using an up-to-date compilerError:and without specifying any "-target" type options. The consequence of ignoringError:this warning is that reflective operations on this class will incorrectlyError:indicate that it is not an inner class.Error:warning: Ignoring InnerClasses attribute for an anonymous inner classError:(ct.ac) that doesn't come with anError:associated EnclosingMethod attribute. This class was probably produced by aError:compiler that did not target the modern .class file format. The recommendedError:solution is to recompile the class from source, using an up-to-date compilerError:and without specifying any "-target" type options. The consequence of ignoringError:this warning is that reflective operations on this class will incorrectlyError:indicate that it is not an inner class.Error:warning: Ignoring InnerClasses attribute for an anonymous inner classError:(ct.k) that doesn't come with anError:associated EnclosingMethod attribute. This class was probably produced by aError:compiler that did not target the modern .class file format. The recommendedError:solution is to recompile the class from source, using an up-to-date compilerError:and without specifying any "-target" type options. The consequence of ignoringError:this warning is that reflective operations on this class will incorrectlyError:indicate that it is not an inner class.Error:warning: Ignoring InnerClasses attribute for an anonymous inner classError:(ct.m) that doesn't come with anError:associated EnclosingMethod attribute. This class was probably produced by aError:compiler that did not target the modern .class file format. The recommendedError:solution is to recompile the class from source, using an up-to-date compilerError:and without specifying any "-target" type options. The consequence of ignoringError:this warning is that reflective operations on this class will incorrectlyError:indicate that it is not an inner class.Information:BUILD SUCCESSFULInformation:Total time: 38.147 secsInformation:32 errorsInformation:0 warningsInformation:See complete output in console

悠索工作室 2019-12-01 23:22:23 0 浏览量 回答数 0

问题

jQuery生成的日期选择表单无法加载日期选择框

小旋风柴进 2019-12-01 19:35:56 990 浏览量 回答数 1

回答

$(class1).click(function(){//点击事件 $(class2).show();//显示class2内容 $(class1).html('.');//改变class2内容 }); $(class1).mouseout(function(){//鼠标移开事件 $(class2).hide();//隐藏class2 });

小旋风柴进 2019-12-02 02:15:52 0 浏览量 回答数 0

回答

Bootstrap grid system <div class="row"> <div class="col-md-1">.col-md-1</div> <div class="col-md-1">.col-md-1</div> <div class="col-md-1">.col-md-1</div> <div class="col-md-1">.col-md-1</div> <div class="col-md-1">.col-md-1</div> <div class="col-md-1">.col-md-1</div> <div class="col-md-1">.col-md-1</div> <div class="col-md-1">.col-md-1</div> <div class="col-md-1">.col-md-1</div> <div class="col-md-1">.col-md-1</div> <div class="col-md-1">.col-md-1</div> <div class="col-md-1">.col-md-1</div> </div> <div class="row"> <div class="col-md-8">.col-md-8</div> <div class="col-md-4">.col-md-4</div> </div> <div class="row"> <div class="col-md-4">.col-md-4</div> <div class="col-md-4">.col-md-4</div> <div class="col-md-4">.col-md-4</div> </div> <div class="row"> <div class="col-md-6">.col-md-6</div> <div class="col-md-6">.col-md-6</div> </div>

a123456678 2019-12-02 02:23:34 0 浏览量 回答数 0

问题

JAVA9之后不推荐使用newInstance()方法

游客bnlxddh3fwntw 2020-04-23 20:51:26 199 浏览量 回答数 1

回答

<div class="row-fluid"> <div class="row-fluid"> <div class="span4"> </div> <div class="span4"> </div> <div class="span4"> </div> </div> <div class="row-fluid"> <div class="span4"> </div> <div class="span4"> </div> <div class="span4"> </div> </div> <div class="row-fluid"> <div class="span4"> </div> <div class="span4"> </div> <div class="span4"> </div> </div> </div> </div> 我这边不方便 没帮你做测试

杨冬芳 2019-12-02 02:32:45 0 浏览量 回答数 0

问题

javascript获取当前表结构

a123456678 2019-12-01 20:25:19 787 浏览量 回答数 1

问题

CSS如何取最后一个class为a的元素?

杨冬芳 2019-12-01 19:52:23 1343 浏览量 回答数 1

回答

把class_a和class_b作为维度再创建两个表class_a_id, class_a_contentclass_b_id, class_b_content原来500w数据的那个表中只保存class_a_id和class_b_id, 最后连表查询就像你上面那样就可以了

落地花开啦 2019-12-02 02:49:24 0 浏览量 回答数 0

问题

解析Apache Spark Scala中的数据org.apache.spark.SparkException:尝试使用textinputformat.record.delimiter时出现任务无序列化错误

社区小助手 2019-12-01 19:30:02 632 浏览量 回答数 1

问题

jQuery 如何获取嵌套较深的相同节点

云栖技术 2019-12-01 19:27:01 702 浏览量 回答数 1

回答

详细解答可以参考官方帮助文档 -keepclasseswithmembernames class ** { native <methods>;}-keepattributes Signature-keep class sun.misc.Unsafe { *; }-keep class com.taobao.** {*;}-keep class com.alibaba.** {*;}-keep class com.alipay.** {*;}-dontwarn com.taobao.**-dontwarn com.alibaba.**-dontwarn com.alipay.**-keep class com.ut.** {*;}-dontwarn com.ut.**-keep class com.ta.** {*;}-dontwarn com.ta.**-keep class anet.**{*;}-keep class org.android.spdy.**{*;}-keep class org.android.agoo.**{*;}-dontwarn anet.**-dontwarn org.android.spdy.**-dontwarn org.android.agoo.**

2019-12-01 23:11:45 0 浏览量 回答数 0

问题

多数据源 启动报错 空指针异常?报错

爱吃鱼的程序员 2020-06-09 10:18:01 0 浏览量 回答数 1

问题

tomcat运行一段时间挂掉,求帮助。

落地花开啦 2019-12-01 19:24:57 1173 浏览量 回答数 1

回答

public class UnSafeSequence { public class TestMath{ private TestMath(){ System.out.println("父类实例化"); } } public class TestMath1 extends TestMath{ public TestMath1(){ System.out.println("子类实例化"); } } /** * @param args */ public static void main(String[] args) { System.out.println(new UnSafeSequence().new TestMath1()); } } java6语言规范中关于private修饰符的描述,顶级类及内部类的定义 6.6.1 if the member or constructor is declared private, then access is permitted if and only if it occurs within the body of the top level class (§7.6) that encloses the declaration of the member or constructor. 如果一个类的成员或构造器声明为private的,那么只有声明这个成员或构造器的顶级类才有权访问(当然声明这个成员和构造函数的类也是可以访问的) 8.A top level class is a class that is not a nested class.A nested class is any class whose declaration occurs within the body of another class or interface. A top level class is a class that is not a nested class.顶级类不是一个嵌套类(内部类),嵌套类(内部类)是申明在其他类或接口中的类鉴于以上的规定描述,那么外部类中可以访问构造器标示为private的TestMath内部类。TestMath1同样是一个内部类,其继承了另一个内部类TestMath,因为一个内部类依赖外部类实例对象而存在,会隐式的关联一个外部类实例 所以 public class TestMath1 extends TestMath{ public TestMath1(){ System.out.println("子类实例化"); } } 可以写成 public class TestMath1 extends UnSafeSequence.TestMath{ public TestMath1(){ UnSafeSequence.this.super(); System.out.println("子类实例化"); } } 这样就可以解释一个内部类的子类为什么可以访问其父类的私有的构造函数了

蛮大人123 2019-12-02 02:08:57 0 浏览量 回答数 0
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