Java Note 10 Abstraction/ Encapsulation | 抽象与封装

Abstraction Class

• Class implementation seperates from the use of the class.
• 必须被继承（抽象类->继承关系）
• Derived class 可以是abstract
• 不能实例化
• 一个类只能inherit from one abstraction class
• 不能和static 同用
• 关键词 abstract & extends

public abstract class TestBase(){
//some code here
}

public class TestDerived() extend TestBase{
//some code here
}

Encapsulation

• The details of implementation are encapsulated and hidden from the user.
• 黑盒理论
• 保护机制
• 一般用关键字private或protected来限制访问

普通封装

public class Box{
private String size;
private String color;

private GiftBox gBox;

//getter
 public String getSize(){
 return size;
 }

 public String getColor(){
 return color;
 }

//setter
 public void setSize(String size){
 this.size = size;
 }

 public void setColor(String color){
 this.color = color;
 }

 public void setGiftBox(GiftBox gBox){
 this.gBox =gBox;
 }
}


public class GiftBox{
private String size;
private String color;

private Box box;

//getter
 public String getSize(){
 return size;
 }

//setter
 public void setSize(String size){
 this.size = size;
 }

 public void setColor(String color){
 this.color = color;
 }

 public void setBox(Box box){
 this.box = box;
 }
 
 public Box getBox(){
 return box;
 }
}

最后

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