java.text.NumberFormat.equals(null) throws NullPointerException

Name: mgC56079 Date: 09/01/97



The java.text.NumberFormat.equals(Object) method does not work correctly.
This method should return false if called with null argument
(see general contract for equals(): JLS 1.0 item 20.1.3, page 459).
But it throws NullPointerException.

Here is the test demonstrating the bug:

-----------------NumberFormatEqualsNullTest.java------------------------
import java.text.*;

public class NumberFormatEqualsNullTest {

    public static void main (String args[]){

      try {
        System.out.println((new NumberFormatTest()).equals(null));
      } catch (NullPointerException e) {
        System.out.println("(new NumberFormatTest()).equals(null) throws unexpected exception");
      }
    }
}

class NumberFormatTest extends NumberFormat {
    public StringBuffer format(double number,
                        StringBuffer toAppendTo,
                        FieldPosition pos) {
      return new StringBuffer("");
    }
    public StringBuffer format(long number,
                        StringBuffer toAppendTo,
                        FieldPosition pos) {
      return new StringBuffer("");
    }
    public Number parse(String text, ParsePosition parsePosition) {
      return new Long(0);
    }
 }


   
---------Output from the test---------------------

(new NumberFormatTest()).equals(null) throws unexpected exception

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