在本文中，我们将给您介绍关于c#–MonoTouchNSClassFromString的详细内容，此外，我们还将为您提供关于606.ConstructStringfromBinaryTree-Easy
在本文中，我们将给您介绍关于c# – MonoTouch NSClassFromString的详细内容，此外，我们还将为您提供关于606. Construct String from Binary Tree - Easy、Caused by: java.lang.ClassCastException: class java.lang.Double cannot be cast to class org.apach...、Caused by: java.lang.ClassNotFoundException: org.apache.commons.collections.Transformer异常、ClassNotFoundException: com.mongodb.client.model.CollationStrength的知识。
本文目录一览：- c# – MonoTouch NSClassFromString
- 606. Construct String from Binary Tree - Easy
- Caused by: java.lang.ClassCastException: class java.lang.Double cannot be cast to class org.apach...
- Caused by: java.lang.ClassNotFoundException: org.apache.commons.collections.Transformer异常
- ClassNotFoundException: com.mongodb.client.model.CollationStrength
c# – MonoTouch NSClassFromString
if(NSClassFromString(@“ADBannerView”))
C#中的等价物是什么？
基本上我想要使用iAd,但我需要检查ADBannerView和ADInterstitialAd是否存在,因为它们并非在所有版本的操作系统上都可用. (而且我宁愿做功能检查而不是iOS版本检查)
我认为这在其他情况下也会有所帮助.
解决方法
通常,版本检查是检查功能的最佳方法.例如.
bool available = UIDevice.CurrentDevice.CheckSystemVersion (4,0);
对于任何4.0版本的iOS(4.0,当ADBannerView添加到iOS时)将返回true.
一种可能的替代方法(可能在每种情况下都不起作用)是创建一个实例并检查它的句柄.由于ObjC是基于消息的发送,init将返回null(.NET构造函数无法做到的事情).例如.
bool available = (new ADBannerView ().Handle != IntPtr.Zero);
请注意,您可能最好使用处理视图或将其集成到ADBannerView的正常创建中.
更新：当然,对NSClassFromString的p / invoke与ObjectiveC代码完全相同:-)
606. Construct String from Binary Tree - Easy
You need to construct a string consists of parenthesis and integers from a binary tree with the preorder traversing way.
The null node needs to be represented by empty parenthesis pair "()". And you need to omit all the empty parenthesis pairs that don‘t affect the one-to-one mapping relationship between the string and the original binary tree.
Example 1:
Input: Binary tree: [1,2,3,4]
1
/ 2 3
/
4
Output: "1(2(4))(3)"
Explanation: Originallay it needs to be "1(2(4)())(3()())",
but you need to omit all the unnecessary empty parenthesis pairs.
And it will be "1(2(4))(3)".
Example 2:
Input: Binary tree: [1,null,4]
1
/ 2 3
\
4
Output: "1(2()(4))(3)"
Explanation: Almost the same as the first example,
except we can‘t omit the first parenthesis pair to break the one-to-one mapping relationship between the input and the output.
分4种情况考虑：
1. 左右子节点都没有，不加()
2. 左右子节点都有，不加()
3. 只有左子节点，不加()
4. 只有右子节点，加()
time: O(n),space: O(height)
/** * DeFinition for a binary tree node. * public class TreeNode { * int val; * TreeNode left; * TreeNode right; * TreeNode(int x) { val = x; } * } */ class Solution { public String tree2str(TreeNode t) { if(t == null) { return ""; } if(t.left == null && t.right == null) { return Integer.toString(t.val); } if(t.right == null) { return t.val + "(" + tree2str(t.left) + ")" + tree2str(t.right); } return t.val + "(" + tree2str(t.left) + ")" + "(" + tree2str(t.right) + ")"; } }
Caused by: java.lang.ClassCastException: class java.lang.Double cannot be cast to class org.apach...
错误：
Caused by: java.lang.ClassCastException: class java.lang.Double cannot be cast to class org.apache.hadoop.io.WritableComparable (java.lang.Double is in module java.base of loader ''bootstrap''; org.apache.hadoop.io.WritableComparable is in unnamed module of loader ''app'')
原因：
在写Comparator时方法写错了，还导错了包
解决： 应该改为
导入这两个包
Caused by: java.lang.ClassNotFoundException: org.apache.commons.collections.Transformer异常
这篇文章主要介绍了Caused by: java.lang.classNotFoundException: org.objectweb.asm.Type异常，文中通过示例代码介绍的非常详细，对大家的学习或者工作具有一定的参考学习价值，需要的朋友们下面随着小编来一起学习学习吧
今天做了一个java对象转Map的例子，执行的时候报错了，如下：
Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/commons/collections/Transformer
at java.lang.classLoader.defineClass1(Native Method)
at java.lang.classLoader.defineClass(ClassLoader.java:621)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
at java.net.urlclassloader.defineClass(urlclassloader.java:260)
at java.net.urlclassloader.access$000(urlclassloader.java:56)
at java.net.urlclassloader$1.run(urlclassloader.java:195)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.urlclassloader.findClass(urlclassloader.java:188)
at java.lang.classLoader.loadClass(ClassLoader.java:307)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.classLoader.loadClass(ClassLoader.java:252)
at java.lang.classLoader.loadClassInternal(ClassLoader.java:320)
at org.apache.commons.beanutils.BeanMap.createTypeTransformers(BeanMap.java:132)
at org.apache.commons.beanutils.BeanMap.(BeanMap.java:68)
at com.example2.pojo.PojoToMap.objectToMap(PojoToMap.java:23)
at com.example2.pojo.PojoToMap.main(PojoToMap.java:16)
Caused by: java.lang.classNotFoundException: org.apache.commons.collections.Transformer
at java.net.urlclassloader$1.run(urlclassloader.java:200)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.urlclassloader.findClass(urlclassloader.java:188)
at java.lang.classLoader.loadClass(ClassLoader.java:307)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.classLoader.loadClass(ClassLoader.java:252)
at java.lang.classLoader.loadClassInternal(ClassLoader.java:320)
... 16 more
先贴上本例的主要代码吧：
package com.example2.pojo; import java.util.Map; import java.util.Set; import org.apache.commons.beanutils.BeanMap; public class PojoToMap { /** * @param args */ public static void main(String[] args) { Employee employee = new Employee(); employee.setName("张三"); employee.setAge(30); Map map; try { map = objectToMap(employee); Set> set = map.entrySet(); for (Map.Entry entry : set) { System.out.println(entry.getKey() + " : " + entry.getValue()); } } catch (Exception e) { e.printstacktrace(); } } public static Map, ?> objectToMap(Object obj) { if (obj == null) return null; return new BeanMap(obj); } }
Employee类：
package com.example2.pojo; public class Employee { private String name; private Integer age; public String getName() { return name; } public void setName(String name) { this.name = name; } public Integer getAge() { return age; } public void setAge(Integer age) { this.age = age; } }
从报错信息上看，是缺少了org.apache.commons.collections.Transformer类，网上下载了commons-collections-3.2.1.jar包，引入后，重新执行，成功。
到此这篇关于Caused by: java.lang.classNotFoundException: org.objectweb.asm.Type异常的文章就介绍到这了,更多相关org.objectweb.asm.Type异常内容请搜索小编以前的文章或继续浏览下面的相关文章希望大家以后多多支持小编！
ClassNotFoundException: com.mongodb.client.model.CollationStrength
刚开始接触morphia中间件操作mongodb数据库。按照官网的例子敲 莫名出现的一个bug。
Caused by: java.lang.classNotFoundException: com.mongodb.client.model.CollationStrength
at java.net.urlclassloader.findClass(urlclassloader.java:381)
at java.lang.classLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:338)
记下来纪念自己给自己挖的坑
问题原因：使用maven导入morphia-1.3.1包和mongodb-java-driver3.2.2包 morphia包级联了mongodb-java-driver3.4.0包，与3.2.2包发生冲突。
解决方法：删掉自己导入的driver包。
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