[Solved] Consider two classes in different packages:package pkg1; class A { void display() { System.out.println("Display A"); } } package pkg2; import pkg1.A;... } }What will happen when class B is compiled? | Java

Java - Packages and Access Control

Consider two classes in different packages:

package pkg1;
class A {
    void display() { System.out.println("Display A"); }
}

package pkg2;
import pkg1.A;
class B {
    public static void main(String[] args) {
        A a = new A();
        a.display();
    }
}

What will happen when class B is compiled?

ACompilation error: class A is not public

BCompilation error: display() is not visible

CRuntime error

DDisplay A

Step-by-Step Solution

Solution:

Step 1: Check class A access modifier
Class A has default access (no modifier), so it is package-private and not visible outside pkg1.
Step 2: Check usage in pkg2
Class B tries to import and use A from pkg1, which is not allowed because A is not public.
Final Answer:
Compilation error: class A is not public -> Option A
Quick Check:
Default class access restricts visibility outside package [OK]

Quick Trick: Default class not visible outside its package [OK]

Common Mistakes:

Assuming default class is public
Confusing method access with class access
Expecting runtime error instead of compile error

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Consider two classes in different packages:

Step 1: Check class A access modifier

Step 2: Check usage in pkg2

Final Answer:

Quick Check:

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