JAVA.CLASS.METH.NF : Method Should be final (Java)

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JAVA.CLASS.METH.NF : Method Should be final (Java)

Summary

A method should be final, since it is not private, not static, and not overridden in any subclass.

Properties

Example

// C.java 
public class C {
  private static int counter;
  private int id = getNextId();

  @Override
  public String toString() {                                // ok: overridden in Sub
      return "#" + getId();
  }

  protected int getId() {                    // "Method Should be final (Java)" warning issued here
      return id;
  }

  private int getNextId() {                                 // ok: private
    return counter++;
  }

  public static int getNumberOfInstances() {                // ok: static
      return counter;
  }
}

// Sub.java 
public class Sub extends C {

  @Override
  public String toString() {                 // "Method Should be final (Java)" warning issued here
    return "sub" + super.toString();
  }
}

In this example, the programmer should make those two methods final, as follows.

// after modification 
public class C {
  private static int counter;
  private int id = getNextId();

  @Override
  public String toString() {
      return "#" + getId();
  }

  protected final int getId() {
      return id;
  }

  private int getNextId() {
      return counter++;
  }

  public static int getNumberOfInstances() {
      return counter;
  }
}

public class Sub extends C {

  @Override
  public final String toString() {
      return "sub" + super.toString();
  }
}

Relevant Configuration File Parameters

The following configuration file parameters affect checks for this warning class.