apache lang--笔记

1、equals

if (this == obj) {
 return true;
}
if (obj == null || this.getClass() != obj.getClass()) {
 return false;
Account account = (Account) obj;
return new EqualsBuilder(）。append(this.id, account.id)
  .append(this.firstName, account.firstName)
   .append(this.lastName, account.lastName)
    .append(this.emailAddress, account.emailAddress)
     .append(this.creationDate, account.creationDate)
      .isEquals();
}

or

return EqualsBuilder.reflectionEquals(this, obj);

2、hashCode

return new HashCodeBuilder(11, 21）。append(this.id)
  .append(this.firstName)
   .append(this.lastName)
    .append(this.emailAddress)
     .append(this.creationDate)
      .toHashCode();

两个参数必须为奇数
or

return HashCodeBuilder.reflectionHashCode(this);

3、compareTo

Account account = (Account) obj;
 return new CompareToBuilder(）。append(this.id, account.id)
  .append(this.firstName, account.firstName)
   .append(this.lastName, account.lastName)
    .append(this.emailAddress, account.emailAddress)
     .append(this.creationDate, account.creationDate)
      .toComparison();

or

return CompareToBuilder.reflectionCompare(this, obj);

4、toString

return new ToStringBuilder(this）。append("id", this.id）。
  .append("firstName", this.firstName)
   .append("lastName", this.lastName)
    .append("emailAddress", this.emailAddress)
     .append("creationDate", this.creationDate)
      .toString();

or

return ToStringBuilder.reflectionToString(this);

注：

public class Account implements Comparable {
 private long id;
 private String firstName;
 private String lastName;
 private String emailAddress;
 private Date creationDate;

 public Account(long id, String firstName, String lastName,
   String emailAddress, Date creationDate) {
  this.id = id;
  this.firstName = firstName;
  this.lastName = lastName;
  this.emailAddress = emailAddress;
  this.creationDate = creationDate;
 }
 .....

}