Java Lessons

Getting Started with Java

Getting Started with Java

Set up your system to start coding in Java ...

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Java Basics

Java Basics

Wondering what all the fuss about Java is? Here is everything you need to get started.

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Variables

Variables

Every variable has to be declared before we can use it.

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Booleans

Booleans

There is a primitive type in Java that tells the truth and nothing but the truth. It's called boolean.

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If and else

If and else

What if we want to execute a code snippet only if a specific condition is met?

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Arrays

Arrays

An array is a container for a fixed number of values of a single type.

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HashMaps

HashMaps

HashMaps are collections of key-value pairs. In a way, they're like dictionaries: every key points to a value.

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Strings

Strings

We've already combined a couple of strings in the earlier chapters. Do you remember?

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ArrayLists

ArrayLists

Often times we don't really know how many items an array will have down the line. If that's the case, it might be a good idea to use an object called ArrayList.

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Loops

Loops

Loops are magical things: they allow us to execute blocks of code for as often as we want.

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Methods

Methods

A method is a named block of code that serves a specific purpose. In order to call a method, we use its name followed by parentheses.

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Classes

Classes

So-called classes are kind of blueprints

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Main and modifiers

Main and modifiers

Every Java program needs an entry point, which is what the main() method provides

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