Java11: Launch Source code file directly

In Java11, you can launch the source code file directly using java launcher.

Hello.java

public class Hello{
      public static void main(String args[]){
            System.out.println("Welcome to Java11 Programming");
      }
}

You can run ‘Hello.java’ application by executing below command ‘java Hello.java’.

$java Hello.java
Welcome to Java11 Programming

You can use this feature to quickly test the applications and to write the scripts using shebang (#!) file.

More details

Till Java10, Java launcher operates in three modes.

a.   Launching a class file

b.   Launching main class of jar file.

c.    Launching main class of a module.

From Java11 onwards, 4^th mode is added, ‘source-file mode’ it launch a class from source file.

In source file mode, class is compiled into memory and executed.

For example,

java Hello.java

is informally equivalent to

javac -d <memory> Hello.java

java -cp <memory> Hello

  

Referencehttps://openjdk.java.net/jeps/330

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