包含标签：Java 的文章
-
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 – strange tochararray () behavior
I'm trying to use tochararray () and found some strange behavior Suppose private static final char [] hex_ CHARS =“012…… -
Java – why is an object sometimes null when it is initialized in a thread and accessed from main?
When I create a new object in a thread, it is a property of an object. I give the thread that it remains null in the m…… -
Java – only remove system. Java from the for loops block Out statement
Any method can only easily delete them from the for loop blocks in the file Before: for( ... ) { ... System.out.printl…… -
Java Swing: JTable contains many models and custom renderers
I have a JTable. I recolor the rows according to the values of the model, as shown below: resultTable = new javax.swin…… -
Java – twitter4j access token is already available
I received an error message when using twitter4j: java.lang.IllegalStateException: Access token already available. twi…… -
Java – pass by value and polymorphism
See English answers > why Java polymers not work in my example public class Animals { int location = 200; //lin…… -
Java invariance, using the “=” operator
The questions about string invariance in java have plenty, in which the author of the problem actually reassigns refer…… -
Any Java way to generate recognition strings similar to Youtube Video strings?
Each video on YouTube has a unique identification string, such as 1cru2fzulec Is there any Java method that can genera…… -
How to accurately calculate the age of Java on the date of birth
I tried to calculate the age of several months considered in Java, so I can't subtract a few years I also want to tell…… -
java – Collectors. Set implementation in toset()?
See English answers > what is default set / list implementation with collectors in Java 8 stream API? 1 Stream.of(1…… -
Java – use durationformatutils to format periods in a good way
This is very effective: out.println(DurationFormatUtils.formatPeriod( new Date().getTime(),mat…… -
Exception in Java platform library
Sometimes I check the Java platform library for inspiration There are many good design solutions, such as this questio…… -
Converting arrays in Java
Suppose we have an array of integers, such as int [] x = {0,1,2,3}; Can I convert x to an array of string type? Can I …… -
Java 8 list copy
See English answers > how to clone ArrayList and also clone its contents? 17 I can't update the employee object pub…… -
Find a method in the Java logging framework scenario
Java has many frameworks / APIs to help you log in to your application: >The Java API has java util. Logging packag…… -
Java – hibernate comment, specifying column defaults
I have a domain object with the following comments @Entity @Table(name = "REQUEST") public class Request { /** …… -
Java – is there a delayed loading implementation of JList?
Is there any way to implement delayed loading with swing's JList? Solution In a way, yes You can create a custom listm…… -
Java – why does the stream operation repeat with the collector?
Allow me to make some complaints, which may be interesting, but I want to describe: "why did you raise this question?"…… -
Java – how do I close the JFrame by clicking the button?
I want to have a button in my window. If I click it, the window will close I found that I can close windows in the fol…… -
Java – retrieves the bits of a number
An attempt is made to retrieve bits of some numbers, such as the flag bit 00001011 of byte 11 below, (byte) 11 >>…… -
Java / Swing: low key button height?
I want to reduce the vertical size of JButton The following code applies to k > 1, but I can't seem to reduce the s…… -
Java thread is in doubt
I previously published a query about Java threads ( link text) Based on the answers I received, I decided to implement…… -
Java – what are the uses of objects of type object
I saw the code below the exercise in the scjp book Object obj = new Object(); First of all, I think this may be a mist…… -
Collision detection between two rectangles in Java
I have two rectangles, a red rectangle (movable) and a blue rectangle When a collision occurs between blue and red rec…… -
Reduce map using java 8 stream API
I have a map of the following table: Map<Integer,Map<String,Double>> START Make inner an internal map, i.e…… -
java – JDK 1.4. 2 “contains (charsequences)” method in string class
In Java 1.5, the contains (charsequences) method was added to the string class This method How would you do this in Ja…… -
java – Jersey：com. sun. jersey. spi. inject. Errors $ErrorMessagesException
I'm having trouble using the Jersey (1.8), Maven and hibernate I received this error (full log) INFO: Scanning for roo…… -
Java NullPointerException for null condition check
I have a very basic method as part of the binary search tree. If the current binary node has a correct child node, it …… -
Base-n series generator for a given number in Java,
I want to create a program to generate a given base-n series, Is there any general mechanism to find these numbers so …… -
Which simulates the optional parameters in Java better?
I have a Java method with three parameters, and I hope it also has the fourth "optional" parameter I know that Java do…… -
Java program for factorial incorrect output
I execute the following java code in the eclipse ide public class Programs { public static void main(String[] arg……