Retrieve Class Property Details Using BeanInfo#getPropertyDescriptors Method

Using BeanInfo#getPropertyDescriptors method, we can get all the properties of the bean.

Example

PropertyDescriptor[] propertyDescriptors(final Class<?> c) throws IntrospectionException {
  BeanInfo beanInfo = Introspector.getBeanInfo(c);
  return beanInfo.getPropertyDescriptors();
}

Above code defines a method propertyDescriptors that retrieves PropertyDescriptor objects for a given class using introspection. It leverages Java's Introspector.getBeanInfo() to obtain class information and then calls getPropertyDescriptors() to retrieve property descriptors. These descriptors provide details about JavaBean properties, aiding dynamic introspection of bean properties at runtime.

 

Find the below working application.

 

Employee.java

package com.sample.app.model;

public class Employee {
  private static int totalEmployees;

  private Integer id;
  private String name;
  private Integer age;

  public Integer getId() {
    return id;
  }

  public void setId(Integer id) {
    this.id = id;
  }

  public String getName() {
    return name;
  }

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

  public Integer getAge() {
    return age;
  }

  public void setAge(Integer age) {
    this.age = age;
  }

  public static int getTotalemployees() {
    return totalEmployees;
  }

}

GetPropertiesOfClass.java

package com.sample.app.introspector;

import java.beans.BeanInfo;
import java.beans.IntrospectionException;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.lang.reflect.Method;

import com.sample.app.model.Employee;

public class GetPropertiesOfClass {

  private static PropertyDescriptor[] propertyDescriptors(final Class<?> c) throws IntrospectionException {
    BeanInfo beanInfo = Introspector.getBeanInfo(c);
    return beanInfo.getPropertyDescriptors();
  }

  public static void main(String[] args) throws Exception {
    PropertyDescriptor[] propertyDescriptors = propertyDescriptors(Employee.class);

    for (PropertyDescriptor propertyDescriptor : propertyDescriptors) {
      String name = propertyDescriptor.getName();
      Class<?> type = propertyDescriptor.getPropertyType();
      Method methodToReadThisProperty = propertyDescriptor.getReadMethod();
      Method methodToUpdateThisProperty = propertyDescriptor.getWriteMethod();

      System.out.println("name : " + name);
      System.out.println("type : " + type);
      if (methodToReadThisProperty != null) {
        System.out.println("methodToReadThisProperty : " + methodToReadThisProperty.getName());
      }
      if (methodToUpdateThisProperty != null) {
        System.out.println("methodToUpdateThisProperty : " + methodToUpdateThisProperty.getName());
      }
      System.out.println();

    }

  }

}

Output

name : age
type : class java.lang.Integer
methodToReadThisProperty : getAge
methodToUpdateThisProperty : setAge

name : class
type : class java.lang.Class
methodToReadThisProperty : getClass

name : id
type : class java.lang.Integer
methodToReadThisProperty : getId
methodToUpdateThisProperty : setId

name : name
type : class java.lang.String
methodToReadThisProperty : getName
methodToUpdateThisProperty : setName

 

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