class

问题 I've taken a class file(say Foo.class ) using JFileChooser and stored it in a File class object(say File a ). now I've to read metadata like methods and variables of this Foo.class using reflection APIs. My question is that, I've stored it in a , which is just a File reference variable . So how can I use any API on a File. or any other suggestion for doing so are also welcomed. 回答1: as i understand,first of all you need to convert class file to Class object you can do that via UrlClassLoader

问题 I've taken a class file(say Foo.class ) using JFileChooser and stored it in a File class object(say File a ). now I've to read metadata like methods and variables of this Foo.class using reflection APIs. My question is that, I've stored it in a , which is just a File reference variable . So how can I use any API on a File. or any other suggestion for doing so are also welcomed. 回答1: as i understand,first of all you need to convert class file to Class object you can do that via UrlClassLoader

问题 This question already has answers here : mysqli_query() expects parameter 1 to be mysqli, object given (3 answers) Closed 16 days ago . I'm learning OOP, so I've probably done something stupid. I had code working with mysql, but read that mysqli is better, especially since I'm wanting to get an array of objects from the database. I've updated my code to try and work with mysqli now, and have solved some problems, but now I'm stuck. From my database class file: class Database { function _

问题 Inspired by theses questions: Get a specific octet from the string representation of an IPv4 address Powershell - Checking IP Address range based on CSV file I am trying to extend the IPAddress class with an ToBigInt() method in PowerShell (if even possible) to be able to easily compare (IPv4 and IPv6) addresses using comparison operations along with -lt and -gt . E.g.: ([IPAddress]'2001:db8::8a2e:370:7334').ToBigInt() -lt ([IPAddress]'2001:db8::8a2e:370:7335').ToBigInt() My first attempt:

问题 Inspired by theses questions: Get a specific octet from the string representation of an IPv4 address Powershell - Checking IP Address range based on CSV file I am trying to extend the IPAddress class with an ToBigInt() method in PowerShell (if even possible) to be able to easily compare (IPv4 and IPv6) addresses using comparison operations along with -lt and -gt . E.g.: ([IPAddress]'2001:db8::8a2e:370:7334').ToBigInt() -lt ([IPAddress]'2001:db8::8a2e:370:7335').ToBigInt() My first attempt:

问题 I used this line of code in a Java class to retrieve a URI which i used to customize the ClassLoader: String uri = getClass().getProtectionDomain().getCodeSource().getLocation().getPath(); Now the same line of code in an Android App in the MainActivity to be exact throw a null pointer exception. Is there something special for Android development ? Thanks. 回答1: getProtectionDomain() is not implemented in Android's version of Java http://developer.android.com/reference/java/lang/Class.html

问题 Having this struct: public struct MyStruct { public int MyInt { get; set; } public bool MyBool { get; set; } public string MyString { get; set; } public MyStruct(int myint, bool mybool, string mystring) { MyInt = myint; MyBool = mybool; MyString = mystring; } } How to store a value of this type in the application settings? The type is not available in the list of the new parameter to select its type and browing to enter the fully qualified type name does not work as it is not found. Most of

问题 I have a ViewController, this view container has a class which creates 2 container views, and adds a table to the first container and a HashtagPicker for the second. The hashTagPicker has a function which is called whenever a change to the selected hashTags happens. question : i want to call a update table function whenever a tag is changed. How can i call a function from the hashtagclass which is defined in the class that contains the containers? 回答1: I personally like the delegate approach

问题 Experimenting with using classes in powershell, I'm uncertain how to display output. For instance in this code block the write-error does not display the error message: class Test { [string] $test Test ([string] $test) { $this.test = $test } [test] Testfail() { try { Get-Childitem F:\ -ErrorAction stop } catch { Write-Host "ERROR!!! $this.test" Exit 1 } return $this.test + "not an error!" } } In this case it's is obvious that the code runs the catch statement as the powershell window exits

问题 Experimenting with using classes in powershell, I'm uncertain how to display output. For instance in this code block the write-error does not display the error message: class Test { [string] $test Test ([string] $test) { $this.test = $test } [test] Testfail() { try { Get-Childitem F:\ -ErrorAction stop } catch { Write-Host "ERROR!!! $this.test" Exit 1 } return $this.test + "not an error!" } } In this case it's is obvious that the code runs the catch statement as the powershell window exits