Re: Variable in Setter

"Mike Schilling" <>
Sat, 11 Aug 2007 07:15:54 -0700
<vwjvi.3146$> wrote:

On Aug 11, 2:03 am, "Mike Schilling" <>

Joshua Cranmer wrote: wrote:

I have this:

Is it possible to use variables like this because I am not sure how
to set up the variable or use concatenator some way to make it

String myvariableOne = "Lastname";
String myvariableTwo = "lastname";
BeanChalker.set + myvariableOne + (myvariableTwo);

If I understand you correctly, what you want is a runtime method
dispatch. The short answer to your question is "no it is not
possible." The medium answer is "well, yes it is, but it is
generally not a good idea to try and use."

The easiest way to do what you want to do is to manually set
functions up yourself:

class Foo {
   private String varA, varB, varC;
   // constructors, etc.

   public void setA(String newA) {varA = newA;}
   public void setB(String newB) {varB = newB;}
   public void setC(String newC) {varC = newC;}

   public void set(String variable, String value) {
       if ("A".equals(variable))
       else if ("B".equals(variable))
       else if ("C".equals(variable))
           throw new IllegalArgumentException("Variable "+variable+
               " not found!");

If you really want the long answer, you probably don't. Use the
previous solution if at all feasible or not at all.

Still want it? Here's the reflection method:

class Foo { /* Defined similar to above sample, except w/o set */ }

class Test {
    public void foobar() {
        String variable = "Lastname";
        String value = "Stroustrup"; // Kudos if you get the
        reference! Foo bar = new Foo(); // assume it works

        Class<?> fooClass = Foo.class;
        try {
           Method m = fooClass.getMethod("set"+variable);
        } catch (Exception e) { // See the APIs for all exceptions
            // Don't do this in real code.

I don't recommend that approach.

A very nice and thorough answer. I have one more suggestion. If
what you're really looking for is a way to choose a setter, and only
a setter (OK, maybe a getter too), at runtime, you're better off
having a single set method that accesses a map:

    private Map values = new HashMap();

    public void set(String key, String value)
        values.set(key, value);

    public String get(String key)
        return values.get(key);


String myvariableTwo = "lastname";
Would I use this for my get info?


or, if you want to constrain the set of possible keys, add the

    static Set keys;
        keys = new HashSet()

    private checkKey(String key)
        if (!keys.contains(key))
            throw new IllegalArgumentException(key);

and begin both get() and set() with calls to checkKey().- Hide
quoted text -

- Show quoted text -

String myvariableTwo = "lastname";
And this would be?

The client wouldn't call checkKey. The get and set methods would be changed

     public void set(String key, String value)
        values.set(key, value);

     public String get(String key)
             return values.get(key);

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