Exploring Packages and Access Modifiers in Java: Example 2

Within Same Package (default method)

We are trying to access a default method within same package but from the different class

Save file: ClassA.java

package pack1;

class ClassA{
	void MethodOfClassA()
	{
		System.out.println("Method of ClassA");
	}

	public static void main(String args[])
	{

    }

}

Save file: ClassB.java

package pack1;

class ClassB{
public static void main(String args[])
  {
    System.out.println("This is ClassB");

    ClassA object = new ClassA();
    object.MethodOfClassA();
  }
}

Output

C:\Users\Hello World>E:

E:\> 
 
E:\>javac -d . ClassA.java

E:\>javac -d . ClassB.java

E:\>java pack1.ClassB
This is ClassB
Method of ClassA

Within Same Package (public method)

We are trying to access a public method Within Same Package but from the different class

Save file: ClassA.java

package pack1;

class ClassA{
	public void MethodOfClassA()
	{
		System.out.println("Method of ClassA");
	}

	public static void main(String args[])
	{

    }

}

Save file: ClassB.java

package pack1;

class ClassB{
public static void main(String args[])
  {
    System.out.println("This is ClassB");

    ClassA object = new ClassA();
    object.MethodOfClassA();
  }
}

Output

E:\>javac -d . ClassA.java

E:\>javac -d . ClassB.java

E:\>java pack1.ClassB
This is ClassB
Method of ClassA

Within Same Package (protected method)

We are trying to access a protected method Within Same Package but from the different class

Save file: ClassA.java

package pack1;

class ClassA{
	protected void MethodOfClassA()
	{
		System.out.println("Method of ClassA");
	}

	public static void main(String args[])
	{

    }

}

Save file: ClassB.java

package pack1;

class ClassB{
public static void main(String args[])
  {
    System.out.println("This is ClassB");

    ClassA object = new ClassA();
    object.MethodOfClassA();
  }
}

Output

E:\>javac -d . ClassA.java

E:\>javac -d . ClassB.java

E:\>java pack1.ClassB
This is ClassB
Method of ClassA

Within Same Package (private method)

We are trying to access a private method Within Same Package but from the different class

Save file: ClassA.java

package pack1;

class ClassA{
	private void MethodOfClassA()
	{
		System.out.println("Method of ClassA");
	}

	public static void main(String args[])
	{

    }

}

Save file: ClassB.java

package pack1;

class ClassB{
public static void main(String args[])
  {
    System.out.println("This is ClassB");

    ClassA object = new ClassA();
    object.MethodOfClassA();
  }
}

Output

E:\>javac -d . ClassA.java

E:\>javac -d . ClassB.java
ClassB.java:9: error: MethodOfClassA() has private access in ClassA
    object.MethodOfClassA();
          ^
1 error