یک روش abstract
متعلق به یک کلاس abstract
است و بدن ندارد
بدنه توسط زیر کلاس ارائه می شود:
// Code from filename: Person.java
// abstract class
abstract class Person {
public String fname = "John";
public int age = 24;
public abstract void study(); // abstract method
}
// Subclass (inherit from Person)
class Student extends Person {
public int graduationYear = 2018;
public void study() { // the body of the abstract method is provided here
System.out.println("Studying all day long");
}
}
// End code from filename: Person.java
// Code from filename: MyClass.java
class MyClass {
public static void main(String[] args) {
// create an object of the Student class (which inherits attributes and methods from Person)
Student myObj = new Student();
System.out.println("Name: " + myObj.fname);
System.out.println("Age: " + myObj.age);
System.out.println("Graduation Year: " + myObj.graduationYear);
myObj.study(); // call abstract method
}
}