Bean Comparator ( Sorting based on Properties of class ) : Collection « Apache Common « Java





Bean Comparator ( Sorting based on Properties of class )

Bean Comparator ( Sorting based on Properties of class )
  
 



package com.googelcode.jpractices.common;

import org.apache.commons.lang.builder.ToStringBuilder;

/**
 * Copyright 2009 @ jPractices v 1.0
 * @SVN URL : http://jpractices.googlecode.com
 * @author Ganesh Gowtham
 * @Homepage : http://ganesh.gowtham.googlepages.com
 */

public class Person {
  private String firstName;

  private String lastName;

  private int salary;

  public Person(String firstName, String lastName, int salary) {
    super();
    this.firstName = firstName;
    this.lastName = lastName;
    this.salary = salary;
  }

  public String getFirstName() {
    return firstName;
  }

  public void setFirstName(String firstName) {
    this.firstName = firstName;
  }

  public String getLastName() {
    return lastName;
  }

  public void setLastName(String lastName) {
    this.lastName = lastName;
  }

  public int getSalary() {
    return salary;
  }

  public void setSalary(int salary) {
    this.salary = salary;
  }

  @Override
  public String toString() {
    return ToStringBuilder.reflectionToString(this);
  }
}
-------------
package com.googelcode.jpractices;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;

import org.apache.commons.beanutils.BeanComparator;

import com.googelcode.jpractices.common.Person;
/**
 * Copyright 2009 @ jPractices v 1.0
 * @SVN URL : http://jpractices.googlecode.com
 * @author Ganesh Gowtham
 * @Homepage : http://ganesh.gowtham.googlepages.com
 */
public class BeanComparatorExample {
  List<Person> personList = new ArrayList<Person>();

  /**
   * Basic method which creates the list of person object's
   *
   */
  void setUpData() {
    personList.add(new Person("jennefer", "gowtham", 35000));
    personList.add(new Person("britney", "spears", 45000));
    personList.add(new Person("tom", "gowtham", 36000));
    personList.add(new Person("joe", "dummy", 45000));
  }
  void sortPersons(String propertyName)
  {
    Comparator<Person> comp = new BeanComparator(propertyName);
    Collections.sort(personList, comp);
    for (Person person : personList) {
      System.out.println(person);
    }
  }
  public static void main(String[] args) {
    BeanComparatorExample beanComparatorExample = new BeanComparatorExample();
    beanComparatorExample.setUpData();
    beanComparatorExample.sortPersons("firstName");
  }
}

   
    
  










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