Java 15 - simple Inheritance

class LabTask15 
{ 
int a=10;
void friend() 
{ 
System.out.println("my friends");
} 
} 
class Best extends LabTask15 
{ 
int b=20;
void bestu() 
{ 
System.out.println("My Bestie1 is Siva.");
System.out.println("My Bestie2 is Sai.");
} 
public static void main(String[] args) 
{ 
LabTask15 n1=new LabTask15();
System.out.println(n1.a);
  Best n2=new Best();

System.out.println(n2.b);

n2.bestu();

}} 

class A 

{ 

int a=10;

void read() 

{ 

System.out.println("This is read method");

} 

} 

class B extends A 

{ 

int b=20;

void add() 

{ 

System.out.println("This is addition");

} 

}