Recent Posts
-
Java simpledateformat parses timezones, such as America / Los_ Angeles
I want to parse the following string in Java and convert it to a date: DTSTART;TZID=America/Los_Angeles:201@R_403_2407…… -
Java – the result seems wrong
My code will show me that this is not an acceptable input If I insert a negative number Then continue to prompt for in…… -
Java – HashMap containskey complexity
I have a method. I write a duplicate item in the list It works well, but I'm worried about the complexity of using con…… -
Java – cannot find files using FileReader
I'm developing a project for my course. We should read one called samplesearch Txt file, the following is the code I a…… -
Java – provides multiple types of sorting for objects
Suppose I have a Java object with multiple string fields public class Person { private String field1 // keeps …… -
Measure the size / length of a single linked list in Java?
I need help making int size(); The method of single linked list in Java This is me so far, but it doesn't return the c…… -
Java – unit test FTP users using Apache Camel
I have the following route In the unit test, because I don't have an available FTP server, I want to use camel's test …… -
Java – warnings when using reflection and generics
How can I rewrite: <T> T callMethod(String methodName,Object[] parameters) throws ... { ... return (T) S…… -
Java vector warning
I'm not sure what's wrong with my code public Vector blob (Pixel px) { Vector v = new Vector(); Point p = new…… -
Arithmetic operators in Java
I encountered a strange arithmetic operation. Here is the code: int i = 9 + + 8 - - 11 + + 13 - - 14 + + 15; Syst…… -
Why should Java method names not contain underscores?
I am using PMD to check java coding violations public void testCaseMethod_4_2_16(){ //some implementation } Of whi…… -
java. lang.ClassNotFoundException：org. apache. struts. action. ActionServlet
I got a Tomcat error: Sep 09,2012 3:27:48 PM org.apache.catalina.core.AprLifecycleListener init Information: The APR b…… -
Jsoup – search for elements by attribute value
So I'm not sure if this is feasible But I want to scan the XML document to find all elements with specific attribute v…… -
Java – HashMap maps integer arrays by considering their values
Given the following code, I get a null (what I want is "1234") But I hope there is a mapping that can treat the key as…… -
Java – Android studio Dalvik VM cannot find class
I'm trying to figure out how to fix the errors in the legacy Android projects I've migrated to Android studio I hope t…… -
Why does Java allow private string [] [] var []
private String[][] var[] private String[][] var[] This code is compiled But shouldn't they create arrays on types or v…… -
Java – introducing counters into loops in Scala
I'm writing a small program that converts a very large file into multiple smaller files, each of which will contain 10…… -
Problems of enumerating types in Java
I'm new to Java programming and have some problems making enumeration types work In my program, I declare the followin…… -
Java – why can’t we create an instance of the collections class (not the collection interface)?
Collections is a public class, and then we can call its implicit default constructor It has no private constructor, wh…… -
Generating XML from classes using java
I asked this question before: Generate XML from a class I want to do this in Java Can I perform the same operation on …… -
Java garbage collection scenario
I'm going through the Java garbage collection process and different scenarios for GC The following is what I am confus…… -
java – studio. SH denies open permission for Android studio in Ubuntu
I downloaded an Android studio for Linux, and then tried to run the studio according to the 'bin' directory in the ins…… -
Java – outofmemoryerror when reading large files
I'm trying to read several large files (over 100MB) So far, it has always been broken in the middle of out of memory e…… -
Each time the new operator is called, Java creates a new object
In Java, when we call a new constructor (), a new object will be created each time, that is; Allocate new memory or as…… -
Java Swing application message dialog help
I'm working on Java Swing applications I need to create a dialog box as shown in the figure I don't know the name; I c…… -
Get data from the Internet with Java
I want to make the following application in Java for my university project I know the core Java I want to know what I …… -
Java – how to draw a border around MapView
I try to draw margins around MapView when I click a button So that's what I've tried. It doesn't work MapView is locat…… -
We have a Java correspondent Net “mustinherit” or “not inheritable”?
How do we declare that a class in Java must inherit rather than instantiate directly from itself, or conversely, how d…… -
Using parameterized (generic) Java classes and normal classes
If I need to write a class that handles' comparable 'data, I can do it in two ways: 1) public class MyClass<T exten…… -
Java – how do I update jlabel text?
I'm making a hangman game, one of which I want to do is jlabel text, which uses ex. "__" Update, depending on the word…… -
java order arraylist string [] by number
I have a list of arrays of type string [] I want to command it with string [0] as int I have this: Collections.sort(li…… -
Comparison of strings in different ways in Java
I have two strings, I think I mean according to my eyes, they are exactly the same But their comparison gave me the wr……