Is there a way to run short bits of Java code without compiling?

Question

Is there a way to run or simulate running Java statements (kind of like IDLE - the Python GUI) without compiling and running the executable? I want to quickly test statement

Answer 1

As of Java 11 (JEP 330) it is now possible to run Java files directly with the java tool:

java Factorial.java 3 4 5

is informally equivalent to

javac -d <memory> Factorial.java
java -cp <memory> Factorial 3 4 5

Java also added support for "shebang" files.

For more details see: http://openjdk.java.net/jeps/330

Answer 2

You should be able to use Beanshell to do this:

http://www.beanshell.org/download.html

Your other alternative, if you're using Eclipse, is to make use of the scrapbook functionality:

http://help.eclipse.org/helios/index.jsp?topic=/org.eclipse.jdt.doc.user/tasks/task-create_scrapbook_page.htm

Answer 3

you might want to checkout janino http://docs.codehaus.org/display/JANINO/Home also ..