抽象クラスの内部では実装を持たない抽象メソッド（abstract me

抽象クラスの内部では実装を持たない抽象メソッド（abstract method）が宣言され、サブクラスは必ずそのメソッドの実装を記述してオーバーライドしなければならない。サブクラスに共通する機能を持たせたい場合などに用いられる。Java言語などでは抽象クラスは抽象メソッド以外の（実装のある）メソッドを宣言することもでき、仕様上は抽象メソッドが存在しなくてもよい（抽象クラスを宣言する意味がないので一般的には一つ以上の抽象メソッドを定義する）

Results (English) 1:

Is declared abstract (abstract method) does not have implementation within an abstract class, subclasses must be describing the implementation of that method need override. If you want to have the functionality to subclasses are used. Abstract abstract class in the Java language, including methods other than by design do not have abstract methods, you can declare a method (the implementation of) good (because it doesn't make sense to declare an abstract class defining one or more abstract methods in General)

Results (English) 2:

Abstract class abstract method that does not have the implementation is in the interior of the (abstract method) is declared, subclass must always override describes the implementation of the method. It is used, for example, if you want to have a feature that is common to the subclass. Abstract class is a such as the Java language can also declare an abstract method other than (some of implementation) method, in general, because the specification on does not make sense to declare the good (abstract class even in the absence of abstract methods to define one or more abstract methods)

Results (English) 3:

Abstract methods have no implementation of the abstract class (Abstract) method is declared, the subclass must override to describe the implementation of the method. This is used when you want to have a common functions and so on. The Java language abstract method abstract class, but the implementation can declare the method, abstract method does not exist on the specification does not mean to declare (in general, abstract class defines one or more abstract method.