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(
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...
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...
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...
java抽象类 java abstract class 有时候,我们需要用到抽象类。比如我们想买水果,但是不确定买的是苹果还是香蕉 Sometimes, we want to abstract a class.For example, We want buy some fruits,but we a
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. ...
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. ...
Here is a concrete class example extending an abstract class in java. package com.journaldev.design; public class Employee extends Person { private int empId; public Employee(String nm, String gen, int id) { super(nm, gen); this.empId=id; } @Override public void work() { if(empId ==...
public abstract class AbstractClassExample { protected int x; private int y; public abstract void func1(); public void func2() { System.out.println("func2"); }}public class AbstractExtendClassExample extends AbstractClassExample { @Override public void func1() { System.out.println("func1"...
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....