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The first part of java basics tutorial, covering the concept of 'everything is an object' with examples of 'hellodate' and 'exec' classes. It also introduces controlling program flow with operators, if-else, while, do-while, for, and switch statements. Examples are given for vowels and consonants identification.
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Java Basics - Part I
(lectures programs)
Sun OnLine Documentations
Chapter 2: Everything is an Object
First Example: HelloDate
Run as applet
public class HelloDate { public static void main(String[] args) { System.out.println("Hello, it's: "); System.out.println(new Date()); } }
% make OR % javac HelloDate.java
% java HelloDate
% javadoc HelloDate.java
(use netscape to look at the documentation HelloDate.html )
Exec Example: Exec
This excute any program, e.g.:
public class Exec { public static void main(String[] args) { try { String command = args[0];
System.out.println("exec: " + command);
Process p = Runtime.getRuntime().exec(command);
p.waitFor(); } catch (InterruptedException e){} catch (IOException e){} } }
Example: % jave Exec prog Where prog can be:
Note that prog.Who produces no output!
Chapter 3: Controlling Program Flow
Run as applet
