Java.xml.bind.JAXBElement.isNil() Method

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Description

The Java.xml.bind.JAXBElement.isNil() method returns true if this element instance content model is nil.

Declaration

Following is the declaration for java.xml.bind.JAXBElement.isNil() method −

public boolean isNil()

Parameters

NA

Return Value

Returns true if this element instance content model is nil.

Exception

NA

Example

The following example shows the usage of java.xml.bind.JAXBElement.isNil() method. To proceed, consider the following Student class which will be used to have objects for marshalling and unmarshalling purposes −

package com.tutorialspoint;

import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
 
@XmlRootElement
public class Student{
 
   String name;
   int age;
   int id;

   public String getName(){
      return name;
   }

   @XmlElement
   public void setName(String name){
      this.name = name;
   }

   public int getAge(){
      return age;
   }

   @XmlElement
   public void setAge(int age){
      this.age = age;
   }

   public int getId(){
      return id;
   }

   @XmlAttribute
   public void setId(int id){
      this.id = id;
   }  
}

Now let us create main class which will show the usage of java.xml.bind.JAXBElement.isNil() method. Here we will create a JAXBElement of a Student object and then get the class of Student. This example checks the content model of JAXBElement object and prints the result.

package com.tutorialspoint;

import javax.xml.bind.JAXBElement;
import javax.xml.namespace.QName;

public class JAXBElementDemo {
   public static void main(String[] args) {
      //Create a student object
      Student student = new Student();

      //fill details of the student
      student.setName("Robert");
      student.setId(1);
      student.setAge(12);
      
      //create JAXBElement of type Student
      //Pass it the student object
      JAXBElement<Student> jaxbElement =  new JAXBElement( 
         new QName(Student.class.getSimpleName()), Student.class, student);

      //check the content model
      boolean isContentNil = jaxbElement.isNil();

      //print the name
      System.out.println("Content Nil (jaxElement)?: "+isContentNil);   

      //create JAXBElement of type Student
      //Pass it a null object
      JAXBElement<Student> jaxbElement1 =  new JAXBElement(
         new QName(Student.class.getSimpleName()), Student.class, null);

      //check the content model
      isContentNil = jaxbElement1.isNil();

      //print the result
      System.out.println("Content Nil (jaxElement1)?: "+isContentNil);  
   }
}

Let us compile and run the above program, this will produce the following result −

Content Nil (jaxElement)?: false
Content Nil (jaxElement1)?: true