Understanding inheritance with public access specifier in Java

Public  accessibility modifier rules are same for instance methods and instance variables.

packageA
├── ClientClassAInSamePackage.java
├── SubClassAInSamePackage.java
├── subPackageA
│   ├── ClientClassAinSameSubPackage.java
│   └── SubClassAinSameSubPackage.java
└── SuperClassA.java

packageB
├── ClientClassBInDifferentPackage.java
├── SubClassBInDifferentPackage.java
└── subPackageB
├── ClientClassBInDifferentSubPackage.java
└── SubClassBInDifferentSubPackage.java

Is SuperClassA  Accessible :

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ChildClass extends from the SuperClass   SubClassAInSamePackage Example :

package com.big.data.java.packageA;

public class SubClassAInSamePackage extends SuperClassA {

    private int subClassAState = 20;

    //getPrivateState() private method is not visible

    @Override
    public String getPublicState() {
        return "SubClassAInSamePackage value is  " + subClassAState;
    }

    @Override
    protected String getProtectedState() {
        return "SubClassAInSamePackage value is  " + subClassAState;
    }

    @Override
    String getDefaultState() { return "SubClassAInSamePackage value is  " + subClassAState; }

    public static void main(String[] args) {
        // parent refrence pointing to the child class , SuperClassA and SubClassA are in same package
        SuperClassA superVar = new SubClassAInSamePackage();

        System.out.println("Parent class method call output for Public is :  " + superVar.getPublicState());

        System.out.println("Parent class method call output for Protected is :  " + superVar.getProtectedState());

        System.out.println("Parent class method call output for Private is :  " + superVar.getDefaultState());

        // Child refrence pointing to its own object
        SubClassAInSamePackage child = (SubClassAInSamePackage) superVar;
        System.out.println("Child class method call output for Public is  " + child.getPublicState());

        System.out.println("Child class method call output for Protected is  " + child.getProtectedState());

        System.out.println("Child class method call output for Private is  " + child.getDefaultState());

    }
}


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Client Class : uses the reference and object of the SuperClass  Example :

package com.big.data.java.packageA;

public class ClientClassAInSamePackage {

    public static void main(String[] args) {

        // accessing superClassA from a client class in the same package as that of the superClass
        SuperClassA superClassA = new SuperClassA();
        // Private is not accessible. 

        System.out.println("Parent class method call output for Public is :  " + superClassA.getPublicState());

        System.out.println("Parent class method call output for Protected is :  " + superClassA.getProtectedState());

        System.out.println("Parent class method call output for Default is :  " + superClassA.getDefaultState());

         //superClassA.getPrivateState() getPrivateState() private method is not visible

    }
}