Java - Fundamental classes

Java module J714

Fundamental classes

Exercises, examples and other material relating to training module J714. This topic is presented on public courses Learning to Program in Java, Java Bootcamp, Java Programming for the Web

Java, sorting, ArrayList example, generics

A Java ArrayList holds an ordered sequence of items like an array, but there are differences: 1. An ArrayList has no fixed size but can be extended by ...

http://www.wellho.net/mouth/1502_Jav ... erics.html [short article]

Learning to Program in Java - training course - Writing Java programs for newcomers to programming.

Learning to Program in Java - Writing Java programs for newcomers to programming. This course introduces you to programming in the Java programming language. ...

http://www.wellho.net/course/sjfull.html [course]

Java Bootcamp - training course - An intense course on Java programming, Servlets and JSPs

Java Bootcamp - An intense course on Java programming, Servlets and JSPs This course introduces you to the Java programming language, and its Internet ...

http://www.wellho.net/course/bjfull.html [course]

StringTokenizer example

import java.util.*; public class Strtok { public static void main(String [] args) { String Demo = "This is a string that we want to tokenize"; ...

http://www.wellho.net/resources/ex.php4?item=j714/Strtok.java [code sample]

Java Programming for the Web - training course - Learn to write server- or client-side applications in Java.

Java Programming for the Web - Learn to write server- or client-side applications in Java. This course introduces you to the Java programming language, ...

http://www.wellho.net/course/jpfull.html [course]

Hashmap example

import java.util.*; import java.io.*; public class Hmap { public static void main(String [] args) throws IOException { BufferedReader Source ...

http://www.wellho.net/resources/ex.php4?item=j714/Hmap.java [code sample]

Using a Vector object

import java.util.*; /** Using a vector*/ public class holt { public static void main(String[] args) { System.out.println("Shortened ...

http://www.wellho.net/resources/ex.php4?item=j714/holt.java [code sample]

Java sorting - comparable v comparator

In Java, you can sort objects that implement the Collection interface, using either the comparable interface or a comparator class. What's the difference? ...

http://www.wellho.net/mouth/1062_Jav ... rator.html [short article]

The java.util package contains many powerful tools for computer scientists, and is an essential element of most Java applications. You'll learn when and how to use stacks, hash tables and many other utility classes. You'll learn how to sort, how to make system calls (and why you shouldn't!), and how to find out more about your environment.

This topic is presented on public courses Learning to Program in Java, Java Bootcamp, Java Programming for the Web

Examples from our training material

About.java	System Properties
Access.java	Access Log analysis in Java - example
Acsort.java	Sorting in Java using the comparable interface
Arlist.java	ArrayList in Java
Bynum.java	A Comparator class
Discfree.java	Running an operating system command from Java
Handbag.java	A class in which descructor calls are delayed
Hmap.java	Hashmap example
Hmapsort.java	Sorting in Java - using collections
Hset.java	Hashset example
Mathop.java	Maths operations
Mhs2.java	A further example of sorting in Java
Mypocket.java	Forcing a destructor to run
Objvprim.java	Object to primitive comparison
Strtok.java	StringTokenizer example
Thing.java	Example of destructor
floater	Float object v float primitive
hinton.java	An Example of a Hashtable
holt.java	Using a Vector object
outmarsh.java	Using a stack

Background information

This module is available under an Open Training Notes License for free download from http://www.training-notes.co.uk.

Topics covered in this module

The fundamental packages.
java.lang.
java.util.
Other fundamental packages.
Data wrappers.
Why use data wrappers?.
Other methods on Float objects.
Other methods on other data wrapper objects.
java.lang.Math.
External low-level calls.
The System class - miscellaneous features.
The System class - garbage collection.
The Runtime and Process classes.
A word of caution on system classes.
Utility objects to hold multiple simple objects.
Vectors.
Stacks.
Hashes.
Enumerations.
The StringTokenizer.
Collections.
ArrayLists.
HashSets.
Iterators and general Collection interfaces.
HashMaps.
Sorting.
Basic sorting in Java.
Comparator classes.
The Comparable interface.

Complete learning

If you are looking for a complete course and not just a information on a single subject, visit our Listing and schedule page.

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We have a technical library of over 700 books on the subjects on which we teach. These books are available for reference at our training centre. Also available is the Opentalk Forum for discussion of technical questions.