PropertyUtils

[kevind duff]

Hello at the Ranch:

I have a simple question regarding PropertyUtils --> PropertyDescriptors


Please consider the code below:
It produces the following output:
After you get the classpath correct. fun fun fun

Hello from TestPropUtil
propDesc.length: 7

propName: class
propType: class java.lang.Class

propName: dressName
propType: class java.lang.String

propName: dressPartCodes
propType: class [Ljava.lang.String;

propName: dressPartNames
propType: class java.util.HashMap

propName: dressSampleArrived
propType: class java.util.Date

propName: dressSampleOrdered
propType: class java.lang.Integer

propName: dressType
propType: class java.lang.String


In the above output what is the propName: class related to the class Dress "as a whole".
More important this:
propName: dressPartCodes
propType: class [Ljava.lang.String;
The property type in the class definition is String[], this kinda gave me pause.
Not what I was expecting. Can someone take a shot at explaining [Ljava.lang.String;

Many thanks for your kind assistance.


KD

import java.beans.PropertyDescriptor;
import java.io.*;

import org.apache.commons.beanutils.PropertyUtils;


public class TestPropUtil  {

  private static PropertyDescriptor[]  propDesc;

  private static Dress dress;

  public static void main (String[]  args) {

  try{

    System.out.println("Hello from TestPropUtil");
    dress = new Dress();
    propDesc =   PropertyUtils.getPropertyDescriptors(Dress.class);
    if (propDesc != null)
         System.out.println("propDesc.length: " + propDesc.length   );

    for (int i = 0;  i < propDesc.length   ; i++ )  {

      System.out.println("\npropName: " + propDesc[i].getName()  );
      System.out.println("propType: " + propDesc[i].getPropertyType()  );


    }




  }
  catch (Exception ex) {

     StringWriter sw = new StringWriter ();
     ex.printStackTrace (new PrintWriter (sw));
     ex.printStackTrace();

  }







  } //main

 

import java.util.Date;
import java.util.HashMap;
import java.util.List;


public  class Dress {


   private  String   dressName ;
   private  String   dressType ;
   private  Date     dressSampleArrived;
   private  Integer  dressSampleOrdered;

   // code for the materials that make up the dress
   private  String[] dressPartCodes;
   // dressPartNames is the key into Hash containing dress Part Names
   private  HashMap<String, String>  dressPartNames ;


   public Dress() {

   }


  public String getDressName() {
       return dressName;
  }
     public void setDressName(String dnIn) {
   	  this.dressName = dnIn;
  }


  public String getDressType() {
         return dressType;
  }
  public void setDressType(String dtIn) {
     	  this.dressType = dtIn;
  }

  public Date getDressSampleArrived() {
           return dressSampleArrived;
    }
    public void setDressSampleArrived(Date dsaIn) {
       	  this.dressSampleArrived = dsaIn;
  }

  public Integer getDressSampleOrdered() {
        return dressSampleOrdered;
   }
  public void setDressSampleOrdered(Integer dsoIn) {
         this.dressSampleOrdered = dsoIn;
  }

  public String[] getDressPartCodes() {
          return dressPartCodes;
  }
  public void setDressPartCodes(String[] dpcIn) {
           this.dressPartCodes = dpcIn;
  }


  public HashMap<String, String> getDressPartNames() {
            return dressPartNames;
  }
  public void setDressPartNames(HashMap<String, String> dpnIn) {
             this.dressPartNames = dpnIn;
  }

}

[Steve Luke]

kevind duff wrote:In the above output what is the propName: class related to the class Dress "as a whole".

I don't know what that means. Can you try to ask it again in a different way?

Can someone take a shot at explaining [Ljava.lang.String;

That is the way String[] is written as a type. The [L means "array of type" then the java.lang.String provides the type of data held in the array.