javac

问题 I worked through a simple example using Project Jigsaw in Java 11.0.1, built using the oracle JDK 11 on Ubuntu 18.04. Following that example, I have created a simple project which compiles to a module, packages the module into a jar, and then uses jlink to create a standalone distribution. Everything works -- the end result is a smallish folder with a stripped down JRE and my module. The project is made of only three files and some folders: .: build.sh src ./src: com module-info.java ./src

问题 I need to add the -parameters java compiler parameter for my tests to succeed. I can do this in gradle already for ./gradlew build to work, or manually by adding -parameters under IntelliJ Settings > Build.. > Compiler > Java Compiler > Additional command line parameters: so they work in the IDE, but I don't want everyone who checks out this repo to have to do a manual step. My .ipr file does show <component name="JavacSettings"> <option name="ADDITIONAL_OPTIONS_STRING" value="-parameters" />

问题 I just install jdk and jre version 8 In windows. Environment variable already set. I try run "java -version" in cmd and it shows the version of java installed. But when I try to compile java project with "javac projectName" system says javac is not recognized as internal or external command. So can anyone tell me how to fix it? here is my environment variable: C:\Users\Foody>echo %PATH% C:\ProgramData\Oracle\Java\javapath;C:\Program Files (x86)\NVIDIA Corporation\Ph ysX\Common;C:\WINDOWS

问题 I just install jdk and jre version 8 In windows. Environment variable already set. I try run "java -version" in cmd and it shows the version of java installed. But when I try to compile java project with "javac projectName" system says javac is not recognized as internal or external command. So can anyone tell me how to fix it? here is my environment variable: C:\Users\Foody>echo %PATH% C:\ProgramData\Oracle\Java\javapath;C:\Program Files (x86)\NVIDIA Corporation\Ph ysX\Common;C:\WINDOWS

问题 I ran into an issue while manipulating some bytecode, where a certain final String constant was not inlined by the java compiler (Java 8), see the example below: public class MyTest { private static final String ENABLED = "Y"; private static final String DISABLED = "N"; private static boolean isEnabled(String key) { return key.equals("A"); } private static String getString(String key, String value) { return key + value; } public static void main(String[] args) throws Exception { String flag =

问题 time javac Main.java --> 0m1.050s time javac Main.java & javac Main.java --> 0m1.808s time javac Main.java & javac Main.java & javac Main.java --> 0m2.690s time javac Main.java & ... 8 time --> 0m8.309s When we run javac command in parallel and with each increase in javac command ~1 sec gets added for all the javac command to complete. Why is there a linear growth is time ? Is all javac process while running involved in some kind on locks , if yes how to overcome it so as not to have a linear

问题 I start working with CodenameOne tool for multiplatform mobile dev. When I created "hello world" app and tried to build an .apk android file, I received [echo] Error! Path to Javac not found! [echo] Make sure the JAVA_HOME enviroment variable is pointing to the JDK [echo] or define javac path in build.xml manually! I added JRE reference to the project, but this didn't solve the issue. How can I solve it? 回答1: Codename One needs to use the actual javac compiler and not ADT since some of our

问题 I am using gradle to build a java project. I see that whenever there is a change in one java file entire projects gets rebuilt. Is there a way to compile only affected java files instead of all the files. 回答1: Gradle now supports compile avoidance , and has support for incremental compilation since earlier. You do not have to do anything to enjoy these features. Just update Gradle. See https://blog.gradle.org/incremental-compiler-avoidance 来源： https://stackoverflow.com/questions/43042305/how

问题 class HelloWorld { public static void main(String[] args) { System.out.println("hey"); } } Command prompt session: C:\Users\zobdos\Desktop>javac HelloWorld.java C:\Users\zobdos\Desktop>dir *.class Volume in drive C is OS Volume Serial Number is A45E-7B01 Directory of C:\Users\zobdos\Desktop 11/20/2010 10:16 AM 417 HelloWorld.class 1 File(s) 417 bytes 0 Dir(s) 8,145,432,576 bytes free C:\Users\zobdos\Desktop>java HelloWorld Exception in thread "main" java.lang.NoClassDefFoundError: HelloWorld

问题 class HelloWorld { public static void main(String[] args) { System.out.println("hey"); } } Command prompt session: C:\Users\zobdos\Desktop>javac HelloWorld.java C:\Users\zobdos\Desktop>dir *.class Volume in drive C is OS Volume Serial Number is A45E-7B01 Directory of C:\Users\zobdos\Desktop 11/20/2010 10:16 AM 417 HelloWorld.class 1 File(s) 417 bytes 0 Dir(s) 8,145,432,576 bytes free C:\Users\zobdos\Desktop>java HelloWorld Exception in thread "main" java.lang.NoClassDefFoundError: HelloWorld