Class getFields() method in Java with Examples

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

Syntax:

public Field[] getFields()

Parameter: This method does not accept any paramter.



Return Value: This method returns the fields of this class in the form of an array of Field objects.

Exception This method throws SecurityException if a security manager is present and the security conditions are not met.

Below programs demonstrate the getFields() method.

Example 1:

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

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Output:

Class represented by myClass: class Test
Fields of myClass: [public java.lang.Object Test.obj]

Example 2:

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// Java program to demonstrate getFields() method
  
import java.util.*;
  
class Main {
  
    private Object obj;
  
    Main()
    {
  
        class Arr {
        };
  
        obj = new Arr();
    }
  
    public static void main(String[] args)
        throws ClassNotFoundException
    {
        Main t = new Main();
  
        // returns the Class object
        Class myClass = t.obj.getClass();
  
        // Get the fields of myClass
        // using getFields() method
        System.out.println("Fields of myClass: "
                           + Arrays.toString(
                                 myClass.getFields()));
    }
}

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Output:

Fields of myClass: []

Reference: https://docs.oracle.com/javase/9/docs/api/java/lang/Class.html#getFields–



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