通过Comparable来实现对自身的比较详解编程语言

import org.apache.commons.lang.builder.CompareToBuilder; 
import org.apache.commons.lang.builder.EqualsBuilder; 
import org.apache.commons.lang.builder.HashCodeBuilder; 
import org.apache.commons.lang.builder.ToStringBuilder; 
import org.apache.commons.lang.builder.ToStringStyle; 
  
/** 
 * The Class Book. 
 */ 
public class Book implements Comparable<book> { 
  
 /** The id. */ 
 private long id; 
  
 /** The name. */ 
 private String name; 
  
 /** 
  * Instantiates a new book. 
  */ 
 public Book() { 
 } 
  
 /** 
  * Gets the id. 
  * 
  * @return the id 
  */ 
 public long getId() { 
  return id; 
 } 
  
 /** 
  * Sets the id. 
  * 
  * @param id 
  *            the new id 
  */ 
 public void setId(long id) { 
  this.id = id; 
 } 
  
 /** 
  * Gets the name. 
  * 
  * @return the name 
  */ 
 public String getName() { 
  return name; 
 } 
  
 /** 
  * Sets the name. 
  * 
  * @param name 
  *            the new name 
  */ 
 public void setName(String name) { 
  this.name = name; 
 } 
  
 /* 
  * (non-Javadoc) 
  * 
  * @see java.lang.Comparable#compareTo(java.lang.Object) 
  */ 
 public int compareTo(Book o) { 
  return new CompareToBuilder().append(this.getId(), o.getId()).toComparison(); 
 } 
}