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Getting Fields Information of a class

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In this section of "Reflection Tutorial" you will know how to retrieve the specific field of any class by using the getField() method.

Getting Fields Information of a class

     

In this section of "Reflection Tutorial" you will know how to retrieve the  specific field of any class by using the getField() method. For this we are taking an example that provides the use of the getField() method in detailed way.

Create an object of  "Rectangle" and then by invoking getClass() method  we will have a class object that will be able to call getField() .

  • getField("x") returns x-axis field object
  • getField("y") returns y-axis  field object
  • getField("height") returns  height field object
  • getField("width") returns width  field object

Since all these fields values are of integer type so we have to use getInt() method.

Here is the full code for GettingField class :

 

 

Getting Field.java

import java.awt.*;
import java.lang.reflect.*;

public class GettingField{
  public static void main(String[] argsthrows Exception{
  Rectangle rect=new Rectangle(50,60);
  Field xfield  = rect.getClass().getField("x");
  Field yfield  = rect.getClass().getField("y");
  Field heightField = rect.getClass().getField("height");
  Field widthField  = rect.getClass().getField("width");
  System.out.println("X Value = "+ xfield.getInt(rect));
  System.out.println("Y Value = "+ yfield.getInt(rect));
  System.out.println("Height Value = "+ heightField.getInt(rect));
  System.out.println("Width Value = "+ widthField.getInt(rect));
  }
}

Output:  

Download this Example

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Posted on: September 10, 2008

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