Sample code analysis of java method rewriting and super keyword

This article mainly introduces the relevant information about java method rewriting and super keyword examples. Friends in need can refer to

java method rewriting and super Keyword

In inheritance, the subclass actually defines a method with the same name as the parent class

It is a method, and the attributes are all the same

Overriding restrictions:

Methods overridden by subclasses cannot have more restrictive permissions than parent class methods

super: Forcefully call the execution of the parent class method

What is the difference between overloading and rewriting?

Overloading occurs in a class, there is no requirement for permissions, and the overloaded method parameters can be different

Overriding occurs in inheritance summary, and is overridden by subclasses The written method cannot have more restrictive permissions than the parent class method. The parameter names in the overridden method are exactly the same

Example code:

  class A{ 
  public void tell(){ 
    System.out.println("我是tell方法"); 
  } 
  //private(同一个类下) < default(在同一包下可以被访问) < public(整个工程都可以访问)  
  //默认default 
  void say(){ 
     
  } 
} 
class B extends A{ 
  //这种方式称为方法的重写 
  public void tell(){ 
    //super不一定在重写中使用，也可以表示那些方法是从父类中被继承过来的。 
    super.tell(); //通过super关键字可以调用父类中的tell方法 
    System.out.println("我重写了tell方法"); 
  } 
} 
class HelloWorld{ 
 
  public static void main(String[] args){ 
    B b = new B();  
    b.tell(); 
  } 
   
}

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