come with me, on the way I'll explain.
Slides Resumos para a SCJP
O João Sávio, Embaixador de Campus da Sun na Unesp Rio Claro preparou vários resumos em slides para quem está estudando para a certificação SCJP. Eles me pareceram muito bons para quem já leu e já aprendeu o básico sobre o assunto e agora está busacando um material de fixação.
Aqui está um deles, o de Conjuntos e Tipos Genéricos:
O restante dos resumos você confere nesse post no blog do João Sávio.
Tags: CA, campus ambassador, certificação, Embaixador de Campus, Java, João Sávio, prova, scjp, Sun Microsystems, UNESP
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Getting enviroment information on Android
16 March, 2010 - 10:18 am
Tags: Android, Eclipse, Java, programming, who am i, whoami
Posted in english | 3 comments
This is a simple program I wrote called Who Am I that shows informations about the device which it is running. Which can be useful for developers and maybe advanced users.
Download:
WhoAmI.tar.bz2 – Eclipse project. It’s configured for Android platform 4 (1.6) but should work without problems in newer Android platform versions.
WhoAmI.apk – Application installation Android [...]
The Caps Lock Java Socket Server
27 February, 2010 - 9:39 pm
Tags: caps lock, Java, programming, socket, upcase
Posted in english | No comments
Here is a simple server for those who are starting studying sockets or just needs a simple socket server example for reuse while writing your own behavior.
Features:
A client should enter a string and the server would answer the same string, with each symbol in up case, when possible.
Default port at 8080.
One client at time.
No multi [...]
Beware the locale
22 February, 2010 - 5:16 pm
Tags: development, i18n, Java, JUnit, locale, programming, String, teste unitário, toString, unit testing
Posted in english | No comments
Today I was programming a toString method for a class widely used in a application, using the very useful String.format that provides a C’s like printf formatter.
@Override
public String toString() {
return String.format("VO[a: %.1f, b: %.1f, c: %.1f]", a, b, a+b);
}
%.1f means a float with one digit precision after the dot separator. The code [...]
Java Font List
5 January, 2010 - 6:10 pm
Tags: AWT, fonts, Java, JVM, Larabie, Larabie Fonts, programming
Posted in english | Comments Off
Here’s a program that lists fonts available in your JVM. You can also set the environment variable JAVA_FONTS to specify the font directory.
import java.awt.GraphicsEnvironment;
public class ListFonts {
public static void main(String args[]){
GraphicsEnvironment e = GraphicsEnvironment.getLocalGraphicsEnvironment();
for(String font:e.getAvailableFontFamilyNames()){
System.out.println(font);
}
}
}
By using pipes you can count how many fonts you have:
java ListFonts|wc -l
On my Ubuntu machine here I got 556 because [...]
Tiled TMX Map Loader for Pygame
I’m using the Tiled Map Editor for a while, I even wrote that tutorial about it. It’s a general purpose tile map editor, written in Java but now migrating to C++ with Qt, that can be easily used with my set of free pixelart tiles.
A map done with Tiled is stored in a file with [...]
CEJUG Tech Day 2009
2 December, 2009 - 12:05 am
Tags: Caelum, cartaz, CEJUG, evento, Fanor, Fortes, poster, Sun, Sun Microsystems, Usix, Usix Technology
Posted in português | No comments
O Grupo de Usuários Java do Ceará estará realizando no próximo dia 04 de dezembro o CEJUG Tech Day na Fanor.
Este ano, precisamente nos dias 8 e 9 de dezembro, a Sun Microsystems estará realizando a edição 2009-2010 do Sun Tech Days, em São Paulo. Provavelmente será o último STD realizado. Felizmente, teremos mais uma [...]
Java: Accessing Private Members
14 November, 2009 - 4:27 am
Tags: Class, Douglas Adams, Field, getclass, getDeclaredField, Hack, Hacking, Java, Life, Object, Object-Oriented Programming, OOP, Reflection
Posted in english | 3 comments
Using reflection to change the accessibility of a private object field and access it at runtime.
import java.lang.reflect.Field;
class Life {
private int meaning = 42;
}
class Hack {
public static void main(String args[]){
Life life = new Life();
[...]
Jedi Name
8 November, 2009 - 5:47 pm
Tags: Java, Jedi, joke, programming, star wars
Posted in english | No comments
A simple Java class that calculates your Jedi name based on your first, last name, mother’s maiden name and the city you grew up.
/*
Jedi first name: 1st 3 letters of last name + 1st 2 letters of first name
Jedi last name: 1st 2 letters of mother’s maiden name + 1st 3 letters of [...]
Cameraman Duke
One more Duke.
Source: cameraman_duke.svg
7 anos de CEJUG
16 September, 2009 - 8:58 pm
Tags: café com tapioca, cartaz, CEJUG, evento, fa7, Física, fortaleza, Java, poster
Posted in português | 2 comments
fontes: cct-set-2009.zip
Quando: esse sábado agora, 19 de Setembro de 2009.
Onde: na Faculdade 7 de Setembro (Rua Alm. Maximiniano da Fonseca, 1395).
Preço: Gratuito.
O CEJUG está comemorando seu sétimo aniversário com um Café com Tapioca especial e imperdível com diversos palestrantes nacionais e muitos sorteios de brindes. A programação completa e as incrições podem ser feitas atráves [...]
