java-introduction

A set of exercises which allow Java beginners to get in touch with the language and some of its properties and see some interesting things at the same time.

Contents

The single exercises are partitioned into packages of the naming schema exercise_n.

Exercise 00: Hello World

The simplest of all simple programs should just show how to run Java programs.

Skills:

• Printing text to the console.
• Running a java program.

Example 01: Treasure Hunt

A playful introduction to control structures.

Skills:

• Method calls
• Control structures

Example 02: A simple Person

Demonstrates some properties of classes.

Skills:

• Creating new object instance
• Creating methods
• Return value
• String concatenation

Example 03: A more elaborate Person

Shows some more properties of types.

Skills:

• Branches
• Arguments

Exercise 04: That's no moon!

A graphical window with a single sprite in it. Can we move it?

Skills:

• Declaring/assigning variables
• Control structures: Branch
• Some easy mathematics

Example 05: A Student is a Person

First steps with inheritance. And lists.

Skills

• Iterate over a list
• Use method of super class.

Example 06: Frequent words

We calculate the word length frequency table of the 1000 most common english words.

Skills

• Map manipulation
• Basic logic

Exercise 07: Fetch the weather

Obtain JSON data from a internet weather source and create command line program with it.

Skills:

• Create executable jar file and execute it on the command line.

Example 08: Not the droids we are looking for

A small game where we must avoid the evil troopers.

Skills:

• Objects, Inheritance, Overriding
• Some creative thinking

Exercise 09: My first web server

A simple HTTP server which just returns some text. Can it be taught to give meaningful answers?

Skills:

• Network code
• Libraries