You can override a private or private final method : final « Class Definition « Java Tutorial

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Java Tutorial » Class Definition » final 
5.27.6.You can override a private or private final methodPrevious/Next
class {
  // Identical to "private" alone:
  private final void f() {
    System.out.println("WithFinals.f()");
  }

  // Also automatically "final":
  private void g() {
    System.out.println("WithFinals.g()");
  }
}

class extends {
  private final void f() {
    System.out.println("OverridingPrivate.f()");
  }

  private void g() {
    System.out.println("OverridingPrivate.g()");
  }
}

class extends {
  public final void f() {
    System.out.println("OverridingPrivate2.f()");
  }

  public void g() {
    System.out.println("OverridingPrivate2.g()");
  }
}

public class MainClass {
  public static void main(String[] args) {
    C op2 = new C();
    op2.f();
    op2.g();

    B op = op2;
    // op.f();
    // op.g();

    A wf = op2;
    // wf.f();
    // wf.g();
  }
}
OverridingPrivate2.f()
OverridingPrivate2.g()
5.27.final
5.27.1.final Variables
5.27.2.'Blank' final fields
5.27.3.Java Final variable: Once created and initialized, its value can not be changed
5.27.4.Using 'final' with method arguments
5.27.5.The effect of final on fields
5.27.6.You can override a private or private final method
5.27.7.Making an entire class final
5.27.8.Demonstrates how final variables are replaced at compilation time
5.27.9.Demonstration of final class members
5.27.10.Base class for demonstation of final methods
5.27.11.Demonstration of final constants
5.27.12.Demonstration of final variables
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