Pojomatic

Pojomatic provides configurable implementations of the equals(Object), hashCode() and toString() methods inherited from java.lang.Object.

For example, the following bean has been "pojomated":

import org.pojomatic.Pojomatic;
import org.pojomatic.annotations.AutoProperty;

@AutoProperty
public class Person {
  private final String firstName;
  private final String lastName;
  private final int age;

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

  public String getFirstName() { return this.firstName; }
  public String getLastName() { return this.lastName; }
  public int getAge() { return this.age; }

  @Override public boolean equals(Object o) {
    return Pojomatic.equals(this, o);
  }

  @Override public int hashCode() {
    return Pojomatic.hashCode(this);
  }

  @Override public String toString() {
    return Pojomatic.toString(this);
  }
}

The above class implements equals and hashCode methods following the best practices outlined in Josh Bloch's Efective Java. Moreover, running

System.out.println(new Person("John", "Doe", 32).toString());

will result in the following output:

Person{firstName: {John}, lastName: {Doe}, age: {32}}

For more information and examples, see the Pojomatic site