如何知道使用Eclipse编译时传递的命令

Question

I am new to Java programming, especially with eclipse. I would really like to know how the java programs are actually getting compiled, it would help me in knowing the Java command line interface better. So, I want to know if there is a way to know exactly which commands are being sent along with the switches to compile and run the java program?

Answer 1

I am sure that you are taking up a J2SE edition of Java programming which should be a fundamental to you. Let me start with giving you an glimpse of a Java Program:

class Greetings
{
public static void main(String args[])
{
     System.out.println("The first character of the command line " + args[0]);
}}

So let's go thru what I meant by each line.

• The class indicates beginning of the class which would contain all of the methods to be into.
• The "public static void main" indicates the main method which would contain the method to be executed.
• And the characters found in the brackets of the only method is known as parameters.
• Those parameters are passed from the command line to the program where they could be worked on depending on the program.

And with this, let me advise you to take up a read on this page for more on Java (J2SE).

http://www.w3resource.com/java-tutorial/java-program-structure.php

Happy Coding!

Answer 2

Unless there are some Eclipse logs that track that (check your installation folder), I doubt Eclipse shows it to you through the IDE. Compiling and running java mostly comes down to two commands:

javac

You compile by executing

javac -cp <your classpath/libs> <your source folder>

java

You run your program by executing

java -cp <classpath> <Class with main method> <main method arguments>