Why does a Java class compile differently with a blank line?

I have the following Java class public class HelloWorld { public static void main(String []args) { } } When I compile this file and run a sha256 on the resulting class file I get 9c8d09e27ea78319ddb85fcf4f8085aa7762b0ab36dc5ba5fd000dccb63960ff HelloWorld.class Next I modified the class and added a blank line like this: public class HelloWorld { public static void … Read more

javac is not recognized as an internal or external command, operable program or batch file [closed]

Closed. This question is not reproducible or was caused by typos. It is not currently accepting answers. Want to improve this question? Update the question so it’s on-topic for Stack Overflow. Closed 8 years ago. Improve this question I am experiencing an error while trying to compile Java programs. I am on Windows (this is … Read more

Error:java: invalid source release: 8 in Intellij. What does it mean?

Im trying to compile some code in I’m using Intellij Ultimate 13.1.4, but I get the following error and I have no idea what it means: Information:Using javac 1.7.0_55 to compile java sources Information:java: Errors occurred while compiling module ‘Example’ Information:Compilation completed with 1 error and 0 warnings in 3 sec Information:1 error Information:0 warnings … Read more

Why does array[idx++]+=”a” increase idx once in Java 8 but twice in Java 9 and 10?

For a challenge, a fellow code golfer wrote the following code: import java.util.*; public class Main { public static void main(String[] args) { int size = 3; String[] array = new String[size]; Arrays.fill(array, “”); for (int i = 0; i <= 100;) { array[i++ % size] += i + ” “; } for (String element: … Read more

javac is not recognized as an internal or external command, operable program or batch file [closed]

I am experiencing an error while trying to compile Java programs. I am on Windows (this is a Windows-specific problem) and I have the latest JDK installed. I have attempted a solution involving the PATH variable, but the error persists. Console output: C:\>set path=C:Program Files (x86)\Java\jdk1.7.0\bin C:\>javac Hello.java ‘javac’ is not recognized as an internal or external … Read more

Javac is not found

As far as I can see you have the JRE in your PATH, but not the JDK. From a command prompt try this: set PATH=%PATH%;C:\Program Files (x86)\Java\jdk1.7.0_17\bin Then try javac again – if this works you’ll need to permanently modify your environment variables to have PATH include the JDK too.

javac : command not found

You installed the Java Runtime Environment (JRE) only, which does not provide javac. For javac, you have to install the OpenJDK Development Environment. You can install java-devel or java-11-devel, which both include javac. By the way: you can find out which package provides javac with a yum search, e.g. su -c ‘yum provides javac’ on more recent releases of CentOS e.g. 6 the command changes to su … Read more