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Java – stores serializable objects in the database

I'm writing an application that needs to write objects to the database For simplicity, I want to serialize objects But……

Java

2020-02-25

Java – is there a case where the abstract class is better than the interface

I have a scenario in which several subclasses have similar implementations and some additional methods, and the implem……

Java

2020-02-25

Java – namespace in JDOM (default)

I'm trying to generate XML documents using the latest JDOM package I encountered a problem with the root element and n……

Java

2020-02-25

Java – type mismatched keys from the map: expected Text,received … LongWritable

I have a simple Hadoop application that takes a CSV file, splits the entries with "," and then calculates the first it……

Java

2020-02-25

Java – how to use ant to check signed jar files?

I use ant signjar task to sign the jar file, and now I want to test it before deployment I can check jarsigner -verify……

Java

2020-02-25

Java – how to improve efficiency?

I'm creating an asteroid clone, but there are still some bells and whistles So far, I have an ArrayList < < aste……

Java

2020-02-25

Java – finds the sum of numbers in the array – excluding the number 13 and the number after it

I want to write a program in Java, give an array and find the sum of all the numbers in the array - with one exception……

Java

2020-02-25

Java – Amazon S3, how to check whether the upload is successful?

I wrote a short test code in Java to upload the PDF file generated in memory In this test code, I only use a virtual b……

Java

2020-02-25

Here is the java servlet interface

I'm new to Java I'm creating a servlet and getting the wrong interface here Can you make me understand this problem? I……

Java

2020-02-25

Java – no credit card processing for Google Checkout / Amazon / paypal

If I want to process payment directly instead of through Google / Amazon / paypal, what should I do? Is there a Java A……

Java

2020-02-25

Java – standard JPA 2 and 3 tables

I'm trying to create a condition to retrieve some objects from three tables (Association, update and detail) Details r……

Java

2020-02-25

Java – position in the lower right corner of the screen

I need to put JFrame on the screen But I can't make them appear on the right side at the bottom of the screen Please h……

Java

2020-02-25

Java gridbaglayout anchor

Learn gridbaglayout. The problem here is the name and label com@R_950_2419 @It does not appear at the top of the panel……

Java

2020-02-25

How do I group vectors into vector lists?

I have some data that looks like this (such as false data): dressId color 6 yellow 9 ……

Java

2020-02-25

Java – scan tree structure from bottom to top?

If the following tree structure or similar structure is given: I want to return the string zyxwvut I know how to do th……

Java

2020-02-25

Add package to Java project structure

I've been working on a local project, and sometimes I hand it over to someone else The question is: is there another w……

Java

2020-02-25

Java – use a specific pattern to format an instant as a string

I'm trying to format instant as a string using a specific format According to the question of format instant to string……

Java

2020-02-25

Java – invalid sort on date in JTable

Look at the code below import java.awt.*; import java.awt.event.*; import java.text.NumberFormat; import java.text.Par……

Java

2020-02-25

Java – confused about ThreadLocal

I just learned about ThreadLocal this morning I read that it should always be final and static: private static final T……

Java

2020-02-25

Java – completable future | then apply vs thenpose

I can't let my head revolve around the difference between thenapply () and thenpose () So can anyone provide an effect……

Java

2020-02-25

Java – spring throwing httpmediatypenotacceptableexception: an acceptable representation cannot be found due to a point in the URL path

Final editing So after research, because the answer is not because of what I see, I found that spring does some strang……

Java

2020-02-25

Java – how to use the custom JTable cell editor and cell renderer

I have created a JTable with custom table rendering and custom cell editor, which can give the results in the image I ……

Java

2020-02-25

The difference between equals and colons in Java properties files

In spring, you can use different property files to configure messages, so they are often like this: message.key=text h……

Java

2020-02-25

Java – use Guice injection and actor to throw null pointers

I get a null pointer exception on the field injection of the server, which starts as an akka actor Plan part: private ……

Java

2020-02-25

Java simpledateformat time zone offset, minutes separated by colons

In Java, how to use simpledateformat to get "2012-11-25t23:50:56.193 01:00"? If I use Z format "Yyyy mm dd't'hh: mm: S……

Java

2020-02-25

Java RSA encryption

I tried to encode a simple string "test" back and forth public static String encode(Key publicKey,String data) throws ……

Java

2020-02-25

Validating a certificate in Java throws an exception – a valid certificate path for the requested target cannot be found

I have a web application that requires the client to send its certificate. The server must verify the certificate (tha……

Java

2020-02-25

Java – a protected member accessed in a derived class using a base class instance

I created an instance of the base class in a derived class and tried to access protected members I can directly access……

Java

2020-02-25

Kotlin for deconstruction, quadruple, quintuple, etc

I am looking for a clean way to create destructible objects online kotlin. Pair and kotlin Triple covers many use case……

Java

2020-02-25

Java – using Jersey’s dependency injection

If I use Jersey 1.12, and I have multiple resource classes, and they all need to access some shared context, what is t……

Java

2020-02-25

Java – sets the background image of the surfaceview

Is there any way to set the background image of surfaceview? Do I have to do it in XML, or can I do everything in Java……

Java

2020-02-24

Java – can you use throw instead of break in a switch statement?

Can I throw or exit a switch statement without using the break keyword? Why use throwing instead of rest? switch(numbe……

Java

2020-02-24

搜索内容

Java – stores serializable objects in the database

Java – is there a case where the abstract class is better than the interface

Java – namespace in JDOM (default)

Java – type mismatched keys from the map: expected Text,received … LongWritable

Java – how to use ant to check signed jar files?

Java – how to improve efficiency?

Java – finds the sum of numbers in the array – excluding the number 13 and the number after it

Java – Amazon S3, how to check whether the upload is successful?

Here is the java servlet interface

Java – no credit card processing for Google Checkout / Amazon / paypal

Java – standard JPA 2 and 3 tables

Java – position in the lower right corner of the screen

Java gridbaglayout anchor

How do I group vectors into vector lists?

Java – scan tree structure from bottom to top?

Add package to Java project structure

Java – use a specific pattern to format an instant as a string

Java – invalid sort on date in JTable

Java – confused about ThreadLocal

Java – completable future | then apply vs thenpose

Java – spring throwing httpmediatypenotacceptableexception: an acceptable representation cannot be found due to a point in the URL path

Java – how to use the custom JTable cell editor and cell renderer

The difference between equals and colons in Java properties files

Java – use Guice injection and actor to throw null pointers

Java simpledateformat time zone offset, minutes separated by colons

Java RSA encryption

Validating a certificate in Java throws an exception – a valid certificate path for the requested target cannot be found

Java – a protected member accessed in a derived class using a base class instance

Kotlin for deconstruction, quadruple, quintuple, etc

Java – using Jersey’s dependency injection

Java – sets the background image of the surfaceview

Java – can you use throw instead of break in a switch statement?

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