Example 1: abstract class Employee {//定义抽象类Employeeprivate String name;//这是三个抽象类的私有成员private String address;private int age;public Employee(String name,String address,int age) {//抽象类的构造方法this.name=name;this.address=address;this.age=age;}public String getName() {//抽...
public AbstractClassExample() { // 构造器中可以执行一些初始化操作 } } 接下来,我们创建一个继承自AbstractClassExample的具体类,并实现其中的抽象方法: java public class ConcreteClass extends AbstractClassExample { // 实现抽象方法 @Override public void abstractMethod() { // 在这里实现抽象方法的具体逻辑...
Sometimes, we want to abstract a class.For example, We want buy some fruits,but we are not sure we buy apple or pear. 我们抽象出一个类叫水果 Now we can abstract a class named Fruit 水果就作为了一个抽象类和一个父亲类 Fruit is a abstract class and it is a father class. 苹果和梨就...
在Java中,抽象类表示的是一种继承关系,一个类只能继承一个抽象类,但是一个类却可以实现多个接口。 我们使用 abstract class 来定义抽象类,具体的实现过程,我们来看下面的例子:👇👇👇 Example 1: abstract class Employee {//定义抽象类Employee private String name;//这是三个抽象类的私有成员 private Strin...
An abstract class can have both the regular methods and abstract methods. For example, abstract class Language { // abstract method abstract void method1(); // regular method void method2() { System.out.println("This is regular method"); } } To know about the non-abstract methods, visit...
If a class implements an interface, it must implement all of its methods in the interface, otherwise, this class must be an abstract class. if it is an abstract class, it can leave some methods in the interface unimplemented.refer to the following example. ...
3. Java Abstract Keyword Example Let’s see an example ofabstractkeyword. In given example, we have anabstract classAnimalwhich has oneabstract methodmakeNoise(). This class is inherited by two child classes i.e.DogandCat. Both classes implement the methodmakeNoise()according to their nature....
If a class implements an interface, it must implement all of its methods in the interface, otherwise, this class must be an abstract class. if it is an abstract class, it can leave some methods in the interface unimplemented.refer to the following example. ...
public abstract void work(); @Override public String toString(){ return "Name="+this.name+"::Gender="+this.gender; } public void changeName(String newName) { this.name = newName; } } Notice thatwork()is an abstract method and it has no-body. Here is a concrete class example extendi...
abstract class <class_name> { 属性; 方法; } abstract关键词表示该类是抽象的，class...