Please advice on where can I find the lib in order to use the shorter expression of System.out.println() and where should I place that lib.

9

12 Answers

Logging libraries

You could use logging libraries instead of re-inventing the wheel. Log4j for instance will provide methods for different messages like info(), warn() and error().

Homemade methods

or simply make a println method of your own and call it:

void println(Object line) { System.out.println(line); } println("Hello World");

IDE keyboard shortcuts

IntelliJ IDEA and NetBeans:

you type sout then press TAB, and it types System.out.println() for you, with the cursor in the right place.

Eclipse:

Type syso then press CTRL + SPACE.

Other

Find a "snippets" plugin for your favorite text editor/IDE

Static Import

import static java.lang.System.out; out.println("Hello World");

Explore JVM languages

Scala

println("Hello, World!")

Groovy

println "Hello, World!"

Jython

print "Hello, World!"

JRuby

puts "Hello, World!"

Clojure

(println "Hello, World!")

Rhino

print('Hello, World!');
12
void p(String l){ System.out.println(l); }

Shortest. Go for it.

2

Java is a verbose language.

If you are only 3 days in, and this is already bothering you, maybe you'd be better off learning a different language like Scala:

scala> println("Hello World") Hello World

In a loose sense, this would qualify as using a "library" to enable shorter expressions ;)

8

Some interesting alternatives:

OPTION 1

PrintStream p = System.out; p.println("hello");

OPTION 2

PrintWriter p = new PrintWriter(System.out, true); p.println("Hello");

For Intellij IDEA type sout and press Tab.

For Eclipse type syso and press Ctrl+Space.

2

Use log4j or JDK logging so you can just create a static logger in the class and call it like this:

LOG.info("foo")

In Java 8 :

 List<String> players = new ArrayList<>(); players.forEach(System.out::println);
0

As Bakkal explained, for the keyboard shortcuts, in netbeans you can go to tools->options->editor->code templates and add or edit your own shortcuts.

In Eclipse it's on templates.

My solution for BlueJ is to edit the New Class template "stdclass.tmpl" in Program Files (x86)\BlueJ\lib\english\templates\newclass and add this method:

public static <T> void p(T s) { System.out.println(s); }

Or this other version:

public static void p(Object s) { System.out.println(s); }

As for Eclipse I'm using the suggested shortcut syso + <Ctrl> + <Space> :)

A minor point perhaps, but:

import static System.out; public class Tester { public static void main(String[] args) { out.println("Hello!"); } }

...generated a compile time error. I corrected the error by editing the first line to read:

import static java.lang.System.out; 
package some.useful.methods; public class B { public static void p(Object s){ System.out.println(s); } }
package first.java.lesson; import static some.useful.methods.B.*; public class A { public static void main(String[] args) { p("Hello!"); } }

Using System.out.println() is bad practice (better use logging framework) -> you should not have many occurences in your code base. Using another method to simply shorten it does not seem a good option.

1