Class getField() method in Java with Examples

The getField() method of java.lang.Class class is used to get the specified field of this class, which is the field that is public and its members. The method returns the specified field of this class in the form of Field objects.

Syntax:

public Field getField(String fieldName)
       throws NoSuchFieldException,
              SecurityException

Parameter: This method accepts a parameter fieldName which is the Field to get.

Return Value: This method returns the specified field of this class in the form of Field objects.

Exception This method throws:



  • NoSuchFieldException if a field with the specified name is not found.
  • NullPointerException if name is null
  • SecurityException if a security manager is present and the security conditions are not met.

Below programs demonstrate the getField() method.

Example 1:

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// Java program to demonstrate getField() method
  
import java.util.*;
  
public class Test {
  
    public Object obj;
  
    public static void main(String[] args)
        throws ClassNotFoundException, NoSuchFieldException
    {
  
        // returns the Class object for this class
        Class myClass = Class.forName("Test");
  
        System.out.println("Class represented by myClass: "
                           + myClass.toString());
  
        String fieldName = "obj";
  
        // Get the field of myClass
        // using getField() method
        System.out.println(
            fieldName + " Field of myClass: "
            + myClass.getField(fieldName));
    }
}

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Output:

Class represented by myClass: class Test
obj Field of myClass: public java.lang.Object Test.obj

Example 2:

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// Java program to demonstrate getField() method
  
import java.util.*;
  
class Main {
  
    private Object obj;
  
    Main()
    {
  
        class Arr {
        };
  
        obj = new Arr();
    }
  
    public static void main(String[] args)
        throws ClassNotFoundException, NoSuchFieldException
    {
        Main t = new Main();
  
        // returns the Class object
        Class myClass = t.obj.getClass();
  
        String fieldName = "obj";
  
        try {
            // Get the field of myClass
            // using getField() method
            System.out.println(
                fieldName + " Field of myClass: "
                + myClass.getField(fieldName));
        }
        catch (Exception e) {
            System.out.println(e);
        }
    }
}

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Output:

java.lang.NoSuchFieldException: obj

Reference: https://docs.oracle.com/javase/9/docs/api/java/lang/Class.html#getField-java.lang.String-

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