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 Tools and Libs > Commons Bean Utils > Get Constructor

Get Constructor 

Apache Commons BeanUtils is a java library useful for accessing bean properties and methods. It provides introspection capabilities to view and manipulate the properties and operations provided by the given class. This requires the libraries commons-beanutils-1.8.3.jar, commons-beanutils-bean-collections-1.8.3.jar, commons-beanutils-core-1.8.3.jar, commons-collections-3.2.1.jar, commons-logging.jar to be in classpath. The following example shows using ConstructorUtils.getAccessibleConstructor() API. It returns a constructor matching the given input parameters.

File Name  :  
com/bethecoder/tutorials/commons_beanutils/common/Student.java 
   
package com.bethecoder.tutorials.commons_beanutils.common;

public class Student {

  private String name;
  private int age;
  private String hobby;

  public Student() {
  }

  public Student(String name, int age, String hobby) {
    super();
    this.name = name;
    this.age = age;
    this.hobby = hobby;
  }

  public String getName() {
    return name;
  }
  public void setName(String name) {
    this.name = name;
  }
  public int getAge() {
    return age;
  }
  public void setAge(int age) {
    this.age = age;
  }
  public String getHobby() {
    return hobby;
  }
  public void setHobby(String hobby) {
    this.hobby = hobby;
  }
  
  public String toString() {
    return "Student[name = " + name + ", age = " + age + ", hobby = " + hobby + "]";
  }
}
   

File Name  :  
com/bethecoder/tutorials/commons_beanutils/GetConstructorTest.java 
Author  :  Sudhakar KV
Email  :  kvenkatasudhakar@gmail.com
   
package com.bethecoder.tutorials.commons_beanutils;

import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;

import org.apache.commons.beanutils.ConstructorUtils;

import com.bethecoder.tutorials.commons_beanutils.common.Student;

public class GetConstructorTest {

  /**
   @param args
   @throws InvocationTargetException 
   @throws IllegalAccessException 
   @throws InstantiationException 
   @throws IllegalArgumentException 
   */
  public static void main(String[] argsthrows IllegalArgumentException, 
    InstantiationException, IllegalAccessException, InvocationTargetException {
    
    Constructor<?> con = ConstructorUtils.getAccessibleConstructor(
        Student.class, new Class<?> [] {
          String.class, int.class, String.class
    });
    
    System.out.println(con);
    
    //Get a new instance from constructor
    Student student = (Studentcon.newInstance("Sriram"2"Chess");
    System.out.println(student);
  }

}
   

It gives the following output,
public com.bethecoder.tutorials.commons_beanutils.
	common.Student(java.lang.String,int,java.lang.String)
	
Student[name = Sriram, age = 2, hobby = Chess]


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