java-7

问题 the problem is that I upgraded to Windows 10 and now I'm installing my tools to programming and now that I installed the JDK 7 of Java, when I try to use in the cmd the command: - "javac" The result of this is: "javac" is not recognized as an internal or external command... But I was edited the PATH with the correct link of jdk, because when I use "java", it is ok. Now, I tryed in the console with this command: PATH=%PATH%;"C:\Program Files\Java\jdk1.7.0_79\bin" And when I ejecute this

问题 Am using Java 1.7. Trying to convert: 2018-05-23T23:18:31.000Z into 2018-05-23 23:18:31 DateUtils class: public class DateUtils { public static String convertToNewFormat(String dateStr) throws ParseException { TimeZone utc = TimeZone.getTimeZone("UTC"); SimpleDateFormat sdf = new SimpleDateFormat("YYYY-MM-dd HH:mm:ss"); sdf.setTimeZone(utc); Date convertedDate = sdf.parse(dateStr); return convertedDate.toString(); } } When trying to use it: String convertedDate = DateUtils.convertToNewFormat(

问题 Am using Java 1.7. Trying to convert: 2018-05-23T23:18:31.000Z into 2018-05-23 23:18:31 DateUtils class: public class DateUtils { public static String convertToNewFormat(String dateStr) throws ParseException { TimeZone utc = TimeZone.getTimeZone("UTC"); SimpleDateFormat sdf = new SimpleDateFormat("YYYY-MM-dd HH:mm:ss"); sdf.setTimeZone(utc); Date convertedDate = sdf.parse(dateStr); return convertedDate.toString(); } } When trying to use it: String convertedDate = DateUtils.convertToNewFormat(

问题 I am using Apache Jersey and trying to POST valid JSON data to the service and it was giving me HTTP 415 error. So with the help of following links I was able to fix this error. Stack Overflow issue for the same error Basically I added some dependencies in pom.xml and some init-params in web.xml explained here This is in answer for above question My method signature @POST @Produces(MediaType.APPLICATION_JSON) @Consumes({ MediaType.APPLICATION_JSON, MediaType.APPLICATION_XML }) public Response

问题 I'm using generics to abstract out Comparable data types, as illustrated in the code supplied below. This case arose from a Java Swing component, specifically from attempting to adapt table model to use generics. I have a working solution to that problem (Case 3A below). However, during the process of arriving at that solution I became confused by the behavior of the compiler when I changed the class signature from T extends Comparable<T> to T extends Comparable<? super T> . Why does the

问题 I'm using generics to abstract out Comparable data types, as illustrated in the code supplied below. This case arose from a Java Swing component, specifically from attempting to adapt table model to use generics. I have a working solution to that problem (Case 3A below). However, during the process of arriving at that solution I became confused by the behavior of the compiler when I changed the class signature from T extends Comparable<T> to T extends Comparable<? super T> . Why does the

问题 I just complied all my java programs, which consists of 4 classes and everything's working fine. I have the GUI, client, server, and the action listeners and an image all in the same folder. I just don't know how to put my local java application that I debugged and tested in JGrasp software onto my webpage. I looked around and I read you need to make a jar file and compress all of them, but I don't know how to do that, neither creating an applet. I tried the most simple way of doing it by

问题 One my linux instance, I am trying to install JDK 7 using the rpm. There is already JRE 6 installed, and I want to install JDK 7 along that. When I try to install JDK 7, getting the following error: # rpm -ivh jdk-7u3-linux-x64.rpm Preparing... ########################################### [100%] file /etc/init.d/jexec from install of jdk-2000:1.7.0_03-fcs.x86_64 conflicts with file from package jre-1.6.0_20-fcs.x86_64 I also tried installing using yum using: # yum install jdk-7u3-linux-x64.rpm

问题 Recently I have tried to use G1GC from jdk1.7.0-17 in my java processor which is processing a lot of similar messages received from an MQ (about 15-20 req/sec). Every message is processed in the separate thread (about 100 threads in stable state) that serviced by Java limited thread pool. Surprisingly, I detected the strange behaviour - as soon as GC starts the full gc cycle it begins to use significant processing time (up to 100% CPU and even more). I was doing refactoring of the code

问题 Recently I have tried to use G1GC from jdk1.7.0-17 in my java processor which is processing a lot of similar messages received from an MQ (about 15-20 req/sec). Every message is processed in the separate thread (about 100 threads in stable state) that serviced by Java limited thread pool. Surprisingly, I detected the strange behaviour - as soon as GC starts the full gc cycle it begins to use significant processing time (up to 100% CPU and even more). I was doing refactoring of the code