Re: redesign exception

From:

boxzou@gmail.com

Newsgroups:

comp.lang.java.programmer

Date:

Thu, 30 Oct 2014 04:27:34 -0700 (PDT)

Message-ID:

<16ffb03e-c585-4cb6-9d9d-90409ee7ff52@googlegroups.com>

If the new catch syntax is added, the equivalent code would be:

        try {
            str.length();
            return Integer.valueOf(str);
        } catch(Fault ex, JreFaultCodes.NumberFormatException_java_lang) {
            System.out.println("processing NumberFormatException: " + ex);
        } catch(Fault ex, JreFaultCodes.NullPointerException_java_lang) {
            System.out.println("processing NullPointException: " + ex);
        } finally {
            System.out.println("hello");
        };

Fault ex is no longer used as a condition, the code like JreFaultCodes.Numb=
erFormatException_java_lang is.

Java 8:
        int num = tri(() -> {
            str.length();
            return Integer.valueOf(str);
        }).katch(JreFaultCodes.NumberFormatException_java_lang, ex -> {
            System.out.println("processing NumberFormatException: " + ex)=

;

            return 400;
        }).katch(JreFaultCodes.NullPointerException_java_lang, ex -> {
            System.out.println("processing NullPointException: " + ex);
            return 500;
        }).finale(() -> {
            System.out.println("hello");
        });

The syntax is a little clumsy here because I am using lambda to simulate =

a language change.

public class ErrorCode implements RuntimeException {
  private final int code;
  private final String description;

  public ErrorCode( int code ) { ... }
  public ErrorCode( int code, String description ) { ... }
  public ErrorCode( int code, Throwable t ) { ... }
  public ErrorCode( int code, String description, Throwable T ) { ... }

  public int getCode() { ... }
  public String getDescription() { ... }
}

try {
  doStuff();
} catch( ErrorCode error ) {
  switch( error.getCode() ) {
   ...
  }
}

--
Leif Roar Moldskred