is Java a free? if so were can i get?

[wtd]

Yes, anything printed with System.out goes to the standard output, which is the terminal window, by default.

Can you please show me the exact program you're compiling?

[Vertico]

code:

import java.io.*; import java.lang.*; class HelloWorld {    public static void main(String[] args)    {       System.out.println("what is up people");    } }

its the exact program u wrote out before. except i changed the print

[wtd]

After you made a change to the program, did you recompile it, or just run it again?

When you make a change to a Java program you must recompile it. You see, the source code lives in (in this case) HelloWorld.java. But when we compile with:

code:

javac HelloWorld.java

The program is converted to a format the Java virtual machine can use, and this is placed in the file HelloWorld.class. It's this file which:

code:

java HelloWorld

Is concerned with. If you don't recompile, that file is unchanged, and any changes to HelloWorld.java won't be seen in the results.

[Vertico]

do u know of a website that can help me through this? like the most slowest newbiest yet effective site to help me learn how to run files?

cuz i keep trying what ur saying and i keep getting nothing back but what i type.

[Hikaru79]

Also, you don't need either of the import statements you used at the top. You don't need java.io.* because you're not using it anywhere in your program, and you don't need java.lang.* because its imported by default -- you don't need to worry about that.

[wtd]

Hikaru79 wrote:

Also, you don't need either of the import statements you used at the top. You don't need java.io.* because you're not using it anywhere in your program

It never hurts to have either of these import statements.

[1of42]

But isn't it extraneous and unnecessary?

[rizzix]

one can argue.. it self-documents the code.. so yea... well refering to the java.lang package i.e.. the java.io is unnecessary.

[Hikaru79]

wtd wrote:

Hikaru79 wrote:

Also, you don't need either of the import statements you used at the top. You don't need java.io.* because you're not using it anywhere in your program

It never hurts to have either of these import statements.

Really? It doesn't hurt to import packages you don't use at all? All this time I've been doing stuff like

Java:

import java.io.BufferedReader; import java.io.FileReader; import java.io.IOException; import java.io.FileNotFoundException;

if those would be the only classes I was using in a particular class. I figured I was getting at least a tiny bit of a boost here for only importing exactly what I needed as opposed to

Java:

import java.io.*;

. Have I been misinformed this whole time? Or is there some sort of benefit to my stinginess, however small it may be? Or is the compiler smart enough only to load the bare neccesities?

[rizzix]

no this is a compile time issue.. not a runtime issue.. the compiler will optimise ur code importing only what you need.. actually imports are all syntatic sugar.. the bytecode uses the full form internally.

but yea.. ur stingyness can reduce compile time.. but not necessarily improve runtime speed... on the other hand it can be seen as self-documentation

[Hikaru79]

rizzix wrote:

no this is a compile time issue.. not a runtime issue.. the compiler will optimise ur code importing only what you need.. actually imports are all syntatic sugar.. the bytecode uses the full form internally.

but yea.. ur stingyness can reduce compile time.. but not necessarily improve runtime speed... on the other hand it can be seen as self-documentation

*phew* At least I have *some* justification Thanks, rizzix!

[rizzix]

yes but there is no point in trying to import stuff you dont use.. its very bad practise... dont do it.

[wtd]

Don't micro-optimize. If you want several classes from "java.io", import "java.io.*". You could spend lots of valuable time individually importing each class you use, but at the end you'd have done nothing the compiler/VM couldn't do in a fraction of a second.

[rizzix]

depends... if you are using a tool like eclipse... they can automaticaly organise and fold ur import statements.. and by organising i mean expanding it completly and grouping/sorting them in a perticular order..

it actually makes, looking up classes used in that class or file, a breeze.. and bsides cuz of the folding, it dosen't really come in way your while coding..

as for the time "wasted" well, actually none of it is actually wasted.. its all done automatically.

[wtd]

Perhaps, but I mean, don't spend time typing out each class name you're importing if a "import javax.swing.*;" or such will do the trick.