Re: Help With TreeMap Warning (Noob?)

From:
Lew <lew@nowhere.com>
Newsgroups:
comp.lang.java.programmer
Date:
Thu, 28 Dec 2006 08:49:06 -0500
Message-ID:
<EJqdnQYeK6HPVg7YnZ2dnUVZ_silnZ2d@comcast.com>
Luc The Perverse wrote:

...\Desktop>javac edit_dist.java
Note: edit_dist.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.

This warning alerts you that your TreeMap declaration was not generic.

E:\Documents and Settings\Luc\Desktop>javac edit_dist.java -Xlint:unchecked
edit_dist.java:41: warning: [unchecked] unchecked call to put(K,V) as a
member of the raw type java.util.TreeMap
                mtm.put(myCurKey, new Integer(min));
                       ^

Here is my code

import java.util.*;
import java.lang.*;

You never need to import java.lang. It is the language itself, so to speak.

import java.math.*;

public class edit_dist{
 TreeMap mtm = null;

The initialization to null is both redundant and superfluous.

You did not use a generic type in the Map declaration.

 edit_dist(){

You should consider making the constructor public, or omitting it altogether.

  mtm = new TreeMap<String, Integer>();
 }


By convention, you should name classes with an initial upper-case letter, each
word part capitalized, and eschew underscores: EditDist.

In most scenarios you should prefer to declare variables with the interface
type rather than the concrete class type:

Map<String, Integer> mtm = new TreeMap<String, Integer>();

public static int naive_editDistance(String Source, String Dest){


By convention, you should name variables and methods with an initial
lower-case letter, each word part capitalized, and eschew underscores:

public static int naiveEditDistance( String source, String dest )
..

They call this "camelCase".

- Lew

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