Java 归档 - Page 154 of 655

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

2020-08-13

Java – warnings when using reflection and generics

How can I rewrite: <T> T callMethod(String methodName,Object[] parameters) throws ... { ... return (T) S……

Java

2020-08-13

Java security class cast exception

Hi, I'm a beginner of Java security. I encountered the following problems when calling: Cipher cipher = Cipher.getInst……

Java

2020-08-13

Java – is this singleton thread safe?

I have a singleton server instance, and I'm curious if my code is thread safe I've read for different singleton modes,……

Java

2020-08-13

Java file compilation with file extension

When we compile Java programs, we use javac file Java commands, but we use java files at runtime So why is it necessar……

Java

2020-08-13

Java – use auto assembled beans in objects created at run time

I have a class B that implements the w interface It has a default implementation of the W method Classes C and D overr……

Java

2020-08-13

Reusing resultset objects in Java

I'm working on a swing project I use JDBC ODBC connection bridge to access the data in SQL database I use the followin……

Java

2020-08-13

Java Swing Games perform poorly when many sprites are on the screen

I'm making a simple tower defense game in swing. When I try to place many elves (more than 20) on the screen, I encoun……

Java

2020-08-13

Java – pass enum member to constructor: “actual and formal parameter lists are different in length”

I'm confused. I think what I do is very stupid. I just can't see it! Central heating control: Radiator class and radia……

Java

2020-08-13

Java – simulate spring bean

I have the following courses: public class Plugin { private DistributionManager manager; public void init(){……

Java

2020-08-13

Java – compile errors using scanner

This is my current course: package Mathias; import java.util.*; public class Scanner { public static void main(S……

Java

2020-08-13

Java – how do I get the first five values from the linkedhashset?

I have a linkedhashset that contains multiple values LinkedHashSet<String> lhs = new LinkedHashSet<String>……

Java

2020-08-13

Java: how to use currenttimemillis() to obtain a long time and output it in X decimal places?

I have a representative system Long. Of currenttimemillis() Then I'll measure it later in the code I've subtracted two……

Java

2020-08-13

Java – stack multiple bufferedimages together?

I have multiple transparent buffered image instances. I want to stack them together (that is, Photoshop layers) and ba……

Java

2020-08-13

Shift right in Java

I just stick to this little logic. I didn't do it right Int is 32 bits, so assume that binary 20 is like // 0000000000……

Java

2020-08-13

Java – what is the value of a week?

I want to use two long values, system Currenttimemillis() is compared with the pre - recorded long I want to see if it……

Java

2020-08-13

Invisible GUI? (Java)(Swing)

I'm studying this program, using swing Every time I export the program and run it, I try to set up the GUI JFrame can,……

Java

2020-08-13

Use java to convert e-mail to its original format

I have been trying to create an object of mimemessage type using JavaMail API and get its original representation, but……

Java

2020-08-13

Multiple object locks in Java?

Is it safe / acceptable to lock private field variables instead of using locked objects? In this way, I can have diffe……

Java

2020-08-13

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……

Java

2020-08-13

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

2020-08-13

In Java, if null pointers rarely occur, it’s best to use catch instead of if

Clean up some loose in my Android application. I found a null pointer exception in the developer console. This has nev……

Java

2020-08-13

Java: questions about immutability and finality

I'm reading "effective Java" In the project of minimizing variability, Joshua Bloch discussed the problem of making a ……

Java

2020-08-13

Java – performance iText vs.pdfbox

I'm trying to convert PDF (my favorite book effective Java, if it's a problem) into text. I checked iText and Apache P……

Java

2020-08-13

Java – how to change JButton icon when selecting?

I want to change the JButton icon when the user presses / releases the button Icon image when JButton is selected Icon……

Java

2020-08-13

Leiningen tried to call Java. Net from the wrong / missing JDK exe

Some time ago, two versions of JDK (1.7.0_09 and 1.7.0_51) were installed on my PC Then I uninstalled the previous one……

Java

2020-08-13

Java optional parameters in method

I want to make a method that requires 1 required parameter and 1 optional parameter, but I found out how to create an ……

Java

2020-08-13

What explains Java bytecode

I want to know if Java has been assembled. In my reading, I find that the compiler creates bytecode and runs it on the……

Java

2020-08-13

Java – print arrays in random order

See English answers > random shuffling of an array 27 Example: int [] myArray = {5,4,3,2,1}; When printing, the res……

Java

2020-08-13

Java beginners if / else if there is a problem

There seems to be a problem with the code block trying to set the string variable, because no matter what I do when I ……

Java

2020-08-13

How can I compare 2 methods in Java?

I have two methods in Java (such as factorial calculation), and I have to test these two methods to find out which is ……

Java

2020-08-13

Huge string table in Java

I have a question about storing a large number of strings in application memory I need to load about 5 million lines f……

Java

2020-08-13

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Each time the new operator is called, Java creates a new object

Java – warnings when using reflection and generics

Java security class cast exception

Java – is this singleton thread safe?

Java file compilation with file extension

Java – use auto assembled beans in objects created at run time

Reusing resultset objects in Java

Java Swing Games perform poorly when many sprites are on the screen

Java – pass enum member to constructor: “actual and formal parameter lists are different in length”

Java – simulate spring bean

Java – compile errors using scanner

Java – how do I get the first five values from the linkedhashset?

Java: how to use currenttimemillis() to obtain a long time and output it in X decimal places?

Java – stack multiple bufferedimages together?

Shift right in Java

Java – what is the value of a week?

Invisible GUI? (Java)(Swing)

Use java to convert e-mail to its original format

Multiple object locks in Java?

Java – outofmemoryerror when reading large files

Java – unit test FTP users using Apache Camel

In Java, if null pointers rarely occur, it’s best to use catch instead of if

Java: questions about immutability and finality

Java – performance iText vs.pdfbox

Java – how to change JButton icon when selecting?

Leiningen tried to call Java. Net from the wrong / missing JDK exe

Java optional parameters in method

What explains Java bytecode

Java – print arrays in random order

Java beginners if / else if there is a problem

How can I compare 2 methods in Java?

Huge string table in Java

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