javac

问题 This might be a silly thing but how is this possible that compiler will show this while Long.Max = 9223372036854775807 ? 回答1: You must have Long literals in Java ending with an L , adding an L to your integer will correct your issue, like so: Long s = 9223372036854775806L This is because by default Java interprets all integers as 32-bit ( int ), the suffix L ensures that your integer is interpreted as 64-bit. 回答2: just put 'l' or 'L' in the end of it and it will be ok, like: long a =

问题 This question already has answers here : Use of uninitialized final field - with/without 'this.' qualifier (4 answers) Closed 5 years ago . I wrote this piece of code and it seems compiler allows accessing uninitialized blank final field when accessed using 'this' keyword: public class TestClass { public final int value1; public int value2; TestClass(int value) { value2 = 2 + this.value1; // access final field using 'this' before initialization gives no compiler error //value2 = 2 + value1; /

问题 I am using ant to build a jar of my project in eclipse. I deploy that jar on tomcat. But whenever an exception happen in my code (which is inside jar), the error stack trace comes but the line number does not come -- instead it says unknown source. How can I get the line numbers in error stack trace? 回答1: You need to compile your jar with debug information. Specifically, you need to find the javac task that compiles the classes that you later jar and add a debug="on" attribute. Example:

问题 Are there any ways to make javac use an existing OSGi-environment for the resolution of build-time dependencies instead of setting the classpath explicitely? I know I could write an OSGi-component that uses the Compiler-API of the JDK, but I think there should be a more straightforward solution. Alternatively, if no such extension is available for javac , does ejc allow such a thing (usable from the command line; I'd be willing to accept an Equinox-only solution with ejc )? 回答1: ant task to

问题 I received a very simple class with some folders that compiles like this without problems: javac -classpath /home/DigestJavaLinux/classes DigestClass.java In the classes folder i have one .class file called OasisEMSecImp.class How ever I need to import the class and use its method in another project, the method generates a digest string for the bank to check a transaction, and receives the total and other parameters. If I add package digestclass; to the begining of the class it does not work,

问题 Can anyone explain why in linux when I start gcc or javac after some time of inactivity it takes a while for them to start. Subsequent invocations are way faster. Is there a way to ensure quick startup always? (This requirement may seem strange, but is necessary in my case). Ubuntu by the way. 回答1: Most likely, it's the time it takes for code pages to fault in. There are a few ways to avoid this delay if you really have to. The simplest would be to run gcc periodically. Another would be to

问题 Searching the web I've found that the Javac compiler is written in Java, and I also peeked at the source on Sun's site. The source is quite big and I couldn't make any headway on it. Also the Eclipse project has a compiler embedded inside, but who could touch its source code ;-). So I thought I'd throw a couple of questions your way: Could the Java compiler be hosted in an Applet? Could the Java compiler be made to work on GAE, with dynamic loading of the resulting class files from the

问题 i need to build android 4.3 master. following instruction from here http://source.android.com/source/building.html . It's going well up to sync-ing source code from repo. When we are trying to build using "make -j4", this is occurring. 1 error make: *** [out/target/common/obj/JAVA_LIBRARIES/core_intermediates/classes-full-debug.jar] Error 41 make: *** Waiting for unfinished jobs.... Here is full log - ============================================ PLATFORM_VERSION_CODENAME=REL PLATFORM_VERSION

问题 I am trying to use Terminal IDE on Lollipop 5.1.1. Using a Samsung E7 device, a mod version of Terminal IDE is provided by someone on XDA here: http://forum.xda-developers.com/showthread.php?t=1340852&page=7 I tried to use javac script in that mod but it gave an unsatisfied link error, saying that: $ javac java.lang.UnsatisfiedLinkError: org.apache.harmony.security.fortress.Services at org.apache.harmony.security.fortress.Engine.getServices(Engine.java:158) at org.apache.harmony.security

问题 I have a quick question regarding javac and packages in Java. I have a simple program (we'll call it Program.java) which is currently in the following directory: myRepository/myProgram In Program.java and other .java files in the myRepository/myProgram directory, I have declared package myProgram.* and also included import myProgram.*; . So when I type javac myProgram/Program.java , it compiles fine and it runs fine if I type java myProgram/Program . However, I'm trying to get the .class