private field and function override/hidden

private-overriden-hidden.java

public class a {
    private int a = 20;
    
    private  int getA(){
        return a;
    }
    
    private void setA(int a){
        this.a = a;
    }
    
    public void echoA(){
        System.out.println(a);
        System.out.println(getA());
        System.out.println(this.a);
    }
}

public class B extends a{
    private int  a = 30;
    
    private int getA(){
        return a;
    }
    
    private  void setA(int a){
        this.a = a;
    }

    public static void main(String[] args){
        B b = new B();
        b.echoA();
    }
}

20
20
20

use javap -c B to dump the byte code view the background