包含标签：Java 的文章
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Java – how to cascade and keep only new entities
I am not sure how to set JPA persistence correctly for the following entities (using eclipse link and transaction type…… -
Java – Android – SQLite – select between date1 and date2
Mac OS-X Android Eclipse and ADT SQLite I'm new to creating Android apps. I've done a lot of research on it, but I hav…… -
Java – the best way to convert a numeric array to a CSV string?
If I have a string [] (assuming no comma), I can simply generate a CSV line For example, String[] header = {"header0",…… -
Java – downcasting / upcasting errors at compile time and runtime?
Please check the following procedure I wonder when the compiler will emit a conversion exception at the compiler level…… -
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…… -
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 – switch the action bar tab programmatically – how to attach parameters?
I am switching my Android (Sherlock) action bar tab, as described in this question: programmatically switch tabs in An…… -
GUI Java program requiring action event button
I am making a simple java program representing the Microsoft Word menu bar. I add an exit button in the file menu... I…… -
Java – when executing HTML Change the HTML link style in textviews after fromhtml
I'm developing an Android application I retrieve some data that looks like this: <a href="http://google.com/" title…… -
Java – why a loop with a char because its index is infinite?
This cycle will continue indefinitely: char a = 100; for(a=100; a>=0;--a) System.out.println(a); Does this happ…… -
Java – how to use math Random() gets the random number in the range
See English answer > math random,only generating a 0? 5 public class Tester{ public static void main(String arg…… -
What is the difference between controller and handler in Java – spring MVC?
Spring MVC documentation sometimes says "handler" or "request handler" For example, http://docs.spring.io/autorepo/doc…… -
java – Integer. parseInt(“9999999990”);
See English answers > unexpected numberformatexception while parsing a hex string to an int value 5 String str="999…… -
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…… -
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…… -
The work of garbage collector in Java
Calling system What objects are available for garbage collection when gc()? Why? public class GCTest { static clas…… -
Java – the fastest byte array connection method
I get a mapping containing the N part of the message as a byte array After the last article enters the map, you must c…… -
Java assignment static variable
When I assign the value of a static int to another int, it performs the assignment in an order that does not seem to f…… -
Java – why count less or even use the synchronized keyword?
I began to learn some Java concurrency concepts public class Count { private int count = 0; public synchroni…… -
Use Apache POI in Java to read integers from numeric units
I have an application that uses Apache POI to read the XLS table When a cell has a value, I use row getCell(i). Getnum…… -
Java – how to use twitter4j to retrieve images in tweets?
I want to issue a query for a keyword or topic tag and retrieve all images from all tweets containing that keyword I c…… -
Java – sharing constants in multiple classes (Android Minesweeper)
I'm using the extended button to create an instance of a class and access integer variables directly for better perfor…… -
Mapping – dozer, instantiationexception on custom converter
I wrote my own customer converter: public class MyFancyCustomConverter extends DozerConverter<Integer,AnObject> ……