Recent questions tagged java

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java - How to configure a log4j file appender which rolls the log file every 15 minutes

I understand that i can use a DailyRollingFileAppender to roll the log file every month, day, half-day, hour ... this. Thanks and Regards. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - in google maps V2 ... fragment.getMap() returns null

I can't get the map ! all I can get is null. here is the code. public class MainActivity extends ... null) myMap.setMyLocationEnabled(true); } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - StringBuilder vs. .concat vs. "+" Operator relative performance different in eclipse than command line?

I was reading about how when possible the java compiler will compile strings concatenated with the "+" operator into ... ())); } } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Unable to convert String to Date by requestBody in spring

I have the below Code : DTO : Class MyDTO { import java.util.Date; private Date dateOfBirth; public Date ... any annotation we can use. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Avoid jvm warmup

If I am designing a test on sorting algorithm can I do this way to avoid JVM warmup ? Thank you! double count ... end; } double avg = count/avg See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Open a new JFrame

I have a main JFrame that has all kinds of panels in it for different functions and people can calculate things in ... not the way to go here. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Why do the JPA2 MetaModel get generated with volatile members?

I have just used org.apache.openjpa.persistence.meta.AnnotationProcessor6 to generate the MetaModel for my JPA2 entities ... this case? Thanks. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - IllegalArgumentException with constructing class using reflection and array arguments

running the following code: public class Test { public Test(Object[] test){ } public static void main(String[] args) ... .java:17) Why is this? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Difference between 'setExact' and 'setAlarmClock'

In my application which was supposed to trigger an alarm at a specified time, alarm whose purpose was to inform ... . Does anyone know it? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Difference between the static initializer block and regular static initialization

As the title says, what exactly is the difference between public static String myString = "Hello World!"; and ... other than the structure ? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Sending an email with an attachment using javamail API

I am trying to send an email with an attachment file in Java. When I send the email without an attachment I ... } How can I correct this? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - handling wrapped exceptions in spring mvc

I have Spring MVC and jackson. When I start an incorrect request, Jackson mapping fails and ... library specific) exceptions? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How to run Spring 3.0 PetClinic in tomcat with Hibernate backed JPA

OK, this probably is supposed to be the easiest thing in the world, but I've been trying for the entire day, and ... . 12.Runs fine!! Thank you! See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How to configure the jdk14 logging's pattern

I guess I can chnage pattern by adding the line java.util.logging.ConsoleHandler.pattern, however where to check ... like %u %h etc? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Convert unsigned byte to signed byte

Is there an easy and elegant way to convert an unsigned byte value to a signed byte value in java? For ... the signed value for this int? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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687 views

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java - how to use Oracle's regexp_like in Hibernate HQL?

I am using oracle 10g and hibernate 3.3.2. I have used regular expression in sql before, now for the first ... some other alternative to do so. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - What is the Swing-equivalent to HTML <optgroup>

I want my JComboBox to group multiple options together, similar to the HTML optgroup: <select> <optgroup label=" ... private so cannot extend). See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - JavaFx response to SwingUtilities.invokeLater

So I am aware that JavaFx's method of updating the GUI while using a thread is called Task but does the code ... to work in a JavaFx project? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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178 views

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java - How to maintain the order of a JSONObject

I am using a JSONObject in order to remove a certin attribute I don't need in a JSON String: JSONObject jsonObject ... Any idea how to do this? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Javac flag to disallow raw types?

Is there any Java compiler flag that one can pass to tell the compiler to disallow the use of raw types ... throw a compilation error otherwise? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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264 views

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java - How does input.nextInt() work exactly?

This is the program public class bInputMismathcExceptionDemo { public static void main(String[] args) { Scanner input ... someone can help me. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Reading date value from excel cell as a String

I am using apache poi library to read excel file. I am stuck while reading password cell. If user gives date ... anyone help on this? Thanks. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Render html in Swing application

I have a swing application that sends commands to server and receives result in XML format. I need to transform ... you in advance for help. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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251 views

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java - Change the thread count of test plan in JMeter, at run time

I want to change the number of threads for a JMeter test plan at runtime. I have Googled my problem and found ... test plan. Is this possible? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How to check if a String is balanced?

I want to test if an input String is balanced. It would be balanced if there is a matching opening and closing ... how does that really help me? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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146 views

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java - Comparing phone numbers in Android

I need to compare two phone numbers to determine if they're from the same sender/receiver. The user may ... or Android-specifically? Thanks. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - parsing dates with variable spaces

I am using Joda to parse dates and have a format where leading zeros are not used, e.g.: Mon Nov 20 14: ... - which I don't use?) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Howto start eclipse in JDK?

I just installed a Maven plug-in into eclipse the first time. Now there is a message on eclipse startup, that i ... in JDK? Thanks in advance. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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