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[java/en] Enum Type

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Raphael Nascimento
2015-10-29 12:46:59 -03:00
parent ef9331fa31
commit 03ef96b2f1
1 changed files with 15 additions and 4 deletions
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@@ -186,9 +186,9 @@ public class LearnJava {
// operations perform as could be expected for a // operations perform as could be expected for a
// doubly-linked list. // doubly-linked list.
// Maps - A set of objects that map keys to values. Map is // Maps - A set of objects that map keys to values. Map is
// an interface and therefore cannot be instantiated. // an interface and therefore cannot be instantiated.
// The type of keys and values contained in a Map must // The type of keys and values contained in a Map must
// be specified upon instantiation of the implementing // be specified upon instantiation of the implementing
// class. Each key may map to only one corresponding value, // class. Each key may map to only one corresponding value,
// and each key may appear only once (no duplicates). // and each key may appear only once (no duplicates).
// HashMaps - This class uses a hashtable to implement the Map // HashMaps - This class uses a hashtable to implement the Map
@@ -450,6 +450,17 @@ class Bicycle {
protected int gear; // Protected: Accessible from the class and subclasses protected int gear; // Protected: Accessible from the class and subclasses
String name; // default: Only accessible from within this package String name; // default: Only accessible from within this package
static String className; // Static class variable
// Static block
// Java has no implementation of static constructors, but
// has a static block that can be used to initialize class variables
// (static variables).
// This block will be called when the class is loaded.
static {
className = "Bicycle";
}
// Constructors are a way of creating classes // Constructors are a way of creating classes
// This is a constructor // This is a constructor
public Bicycle() { public Bicycle() {
@@ -767,7 +778,7 @@ The links provided here below are just to get an understanding of the topic, fee
* [Generics](http://docs.oracle.com/javase/tutorial/java/generics/index.html) * [Generics](http://docs.oracle.com/javase/tutorial/java/generics/index.html)
* [Java Code Conventions](http://www.oracle.com/technetwork/java/codeconv-138413.html) * [Java Code Conventions](http://www.oracle.com/technetwork/java/codeconvtoc-136057.html)
**Online Practice and Tutorials** **Online Practice and Tutorials**