javacompiler | 易学教程

Internal Architecture of Java Compiler [closed]

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问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 4 years ago . I have been working on Java from more than 8 years. Last week, in a small meeting in my company, one of my colleague has asked me how exactly does Java Compiler work? I was with no answer. I tried explaining, like Java Compiler takes statements one by one and converts them to byte

solve error: cannot access Publisher in Android Studio?

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问题 I am getting this error while compilation of my code: Can anyone help me how to solve this error or what might be causing this error? Edit1: Gradle file of the project . And also the error log is attached with the question above.please check it. import com.google.gms.googleservices.GoogleServicesPlugin apply plugin: 'com.android.application' apply plugin: 'io.fabric' android { compileSdkVersion 28 buildToolsVersion '28.0.3' defaultConfig { applicationId "com.veblr.videomate" minSdkVersion 21

Java JavaCompiler.run() compiling anonymous classes as well

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问题 I am trying to load in text files on the fly and compile them. File file = new File("Files/"+fileName+".java"); JavaCompiler compiler = ToolProvider.getSystemJavaCompiler(); compiler.run(null, null, errStream, file.getAbsolutePath()); I then will load the compiled .class files later: public Class loadStrategyClass(File strategyClassFile) throws IOException { FileChannel roChannel = new RandomAccessFile(strategyClassFile, "r").getChannel(); ByteBuffer buffer = roChannel.map(FileChannel.MapMode

Compile and Run java program in linux with path to the .java file and path to external jars

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Yesterday I solved a problem with an answer here on stackoverflow. But I ended up with another problem, I will try to be clear: I have a project folder in the /home/demo/Desktop/xlsToCsv/ directory where inside of it is the java file "xlsToCsv.java" and another directory with the external jars that I need in /home/demo/Desktop/xlsToCsv/jars . Now I need to compile and run my program. Yesterday I ran a command that assumed that I was already inside of /home/demo/Desktop/xlsToCsv/ , and the commands were: javac -cp ".:./jars/*" xlsToCsv.java java -cp ".:./jars/*" xlsToCsv The problem was solved

How to avoid IntelliJ to reset language level?

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问题 I am having troubles with this which have been answered dusin of times on this site. My take on the problem is a bit different. I have a project which builds fine using maven 3.5.x and java release 10 (configured in the maven-compiler-plugin) When looking in IntelliJ's project structure, all modules have language level 10 (but the projects settings is language level 6 and the chosen sdk in the project structure is 1.8... However, even if I change the sdk to java 10 and the projects language

How to avoid IntelliJ to reset language level?

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I am having troubles with this which have been answered dusin of times on this site. My take on the problem is a bit different. I have a project which builds fine using maven 3.5.x and java release 10 (configured in the maven-compiler-plugin) When looking in IntelliJ's project structure, all modules have language level 10 (but the projects settings is language level 6 and the chosen sdk in the project structure is 1.8... However, even if I change the sdk to java 10 and the projects language level to 10, the error pasted below still occurs... ???? My IntelliJ version: IntelliJ IDEA 2018.2.5 To

Java for-loop optimization

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I made some runtime tests with java for loops and recognized a strange behaviour. For my code I need wrapper objects for primitive types like int, double and so on, to simulate io and output parameters, but thats not the point. Just watch my code. How can objects with field access be faster then primitive types? for loop with prtimitive type: public static void main(String[] args) { double max = 1000; for (int j = 1; j < 8; j++) { double i; max = max * 10; long start = System.nanoTime(); for (i = 0; i < max; i++) { } long end = System.nanoTime(); long microseconds = (end - start) / 1000;