java.io Class Hierarchy Diagram

Diagram sources:
Gailer-net.de

java.io cheat sheet for SCJP:
(from book SCJP Sun Certified Programmer for Java 6 Exam 310-065)

Example for using these constructors:
How to read lines from a text file, display them and close all resources?

try{
  BufferedReader reader= new BufferedReader (new FileReader(new File("file.txt")));
  String line=null;
  while( (line=reader.readLine())!=null){
    System.out.println(line);
  }
  reader.close();
}catch(Exception e){}


For other package diagrams, check falkhausen.de