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Dhwani Shah 2015-10-02 14:45:25 -05:00
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@ -1,18 +1,3 @@
---
language: java
contributors:
- ["Jake Prather", "http://github.com/JakeHP"]
- ["Jakukyo Friel", "http://weakish.github.io"]
- ["Madison Dickson", "http://github.com/mix3d"]
- ["Simon Morgan", "http://sjm.io/"]
filename: LearnJava.java
---
Java is a general-purpose, concurrent, class-based, object-oriented computer
programming language.
[Read more here.](http://docs.oracle.com/javase/tutorial/java/)
```java
// Single-line comments start with // // Single-line comments start with //
/* /*
Multi-line comments look like this. Multi-line comments look like this.
@ -47,30 +32,10 @@ public class LearnJava {
/////////////////////////////////////// ///////////////////////////////////////
// Variables // Types & Variables
/////////////////////////////////////// ///////////////////////////////////////
/*
* Variable Declaration
*/
// Declare a variable using <type> <name> // Declare a variable using <type> <name>
int fooInt;
// Declare multiple variables of same type <type> <name1>, <name2>, <name3>
int fooInt1, fooInt2, fooInt3;
/*
* Variable Initialization
*/
// Initialize a variable using <type> <name> = <val>
int fooInt = 1;
// Initialize multiple variables of same type with same value <type> <name1>, <name2>, <name3> = <val>
int fooInt1, fooInt2, fooInt3;
fooInt1 = fooInt2 = fooInt3 = 1;
/*
* Variable types
*/
// Byte - 8-bit signed two's complement integer // Byte - 8-bit signed two's complement integer
// (-128 <= byte <= 127) // (-128 <= byte <= 127)
byte fooByte = 100; byte fooByte = 100;
@ -437,26 +402,26 @@ class PennyFarthing extends Bicycle {
// Example - Food: // Example - Food:
public interface Edible { public interface Edible {
public void eat(); // Any class that implements this interface, must public void eat(); // Any class that implements this interface, must
// implement this method. // implement this method.
} }
public interface Digestible { public interface Digestible {
public void digest(); public void digest();
} }
// We can now create a class that implements both of these interfaces. // We can now create a class that implements both of these interfaces.
public class Fruit implements Edible, Digestible { public class Fruit implements Edible, Digestible {
@Override @Override
public void eat() { public void eat() {
// ... // ...
} }
@Override @Override
public void digest() { public void digest() {
// ... // ...
} }
} }
// In Java, you can extend only one class, but you can implement many // In Java, you can extend only one class, but you can implement many
@ -464,51 +429,10 @@ public class Fruit implements Edible, Digestible {
public class ExampleClass extends ExampleClassParent implements InterfaceOne, public class ExampleClass extends ExampleClassParent implements InterfaceOne,
InterfaceTwo { InterfaceTwo {
@Override @Override
public void InterfaceOneMethod() { public void InterfaceOneMethod() {
} }
@Override @Override
public void InterfaceTwoMethod() { public void InterfaceTwoMethod() {
} }
} }
```
## Further Reading
The links provided here below are just to get an understanding of the topic, feel free to Google and find specific examples.
**Official Oracle Guides**:
* [Java Tutorial Trail from Sun / Oracle](http://docs.oracle.com/javase/tutorial/index.html)
* [Java Access level modifiers](http://docs.oracle.com/javase/tutorial/java/javaOO/accesscontrol.html)
* [Object-Oriented Programming Concepts](http://docs.oracle.com/javase/tutorial/java/concepts/index.html):
* [Inheritance](http://docs.oracle.com/javase/tutorial/java/IandI/subclasses.html)
* [Polymorphism](http://docs.oracle.com/javase/tutorial/java/IandI/polymorphism.html)
* [Abstraction](http://docs.oracle.com/javase/tutorial/java/IandI/abstract.html)
* [Exceptions](http://docs.oracle.com/javase/tutorial/essential/exceptions/index.html)
* [Interfaces](http://docs.oracle.com/javase/tutorial/java/IandI/createinterface.html)
* [Generics](http://docs.oracle.com/javase/tutorial/java/generics/index.html)
* [Java Code Conventions](http://www.oracle.com/technetwork/java/codeconv-138413.html)
**Online Practice and Tutorials**
* [Learneroo.com - Learn Java](http://www.learneroo.com)
* [Codingbat.com](http://codingbat.com/java)
**Books**:
* [Head First Java](http://www.headfirstlabs.com/books/hfjava/)
* [Thinking in Java](http://www.mindview.net/Books/TIJ/)
* [Objects First with Java](http://www.amazon.com/Objects-First-Java-Practical-Introduction/dp/0132492660)
* [Java The Complete Reference](http://www.amazon.com/gp/product/0071606300)