都是基础的pojo类的方法

get set方法 hashcode equals方法

toString方法

@Override
public int compareTo(MessageQueue o) {{int result = this.topic.compareTo(o.topic);if (result != 0) {return result;}}{int result = this.brokerName.compareTo(o.brokerName);if (result != 0) {return result;}}return this.queueId - o.queueId;
}

然后这里还有一个compareTo方法。。

暂时不清楚什么场景会使用消息队列比较。内部实现的话，

是先比较topic，再比较brokerName，最后比较queueId

/*** Compares two strings lexicographically.* The comparison is based on the Unicode value of each character in* the strings. The character sequence represented by this* {@code String} object is compared lexicographically to the* character sequence represented by the argument string. The result is* a negative integer if this {@code String} object* lexicographically precedes the argument string. The result is a* positive integer if this {@code String} object lexicographically* follows the argument string. The result is zero if the strings* are equal; {@code compareTo} returns {@code 0} exactly when* the {@link #equals(Object)} method would return {@code true}.* <p>* This is the definition of lexicographic ordering. If two strings are* different, then either they have different characters at some index* that is a valid index for both strings, or their lengths are different,* or both. If they have different characters at one or more index* positions, let <i>k</i> be the smallest such index; then the string* whose character at position <i>k</i> has the smaller value, as* determined by using the &lt; operator, lexicographically precedes the* other string. In this case, {@code compareTo} returns the* difference of the two character values at position {@code k} in* the two string -- that is, the value:* <blockquote><pre>* this.charAt(k)-anotherString.charAt(k)* </pre></blockquote>* If there is no index position at which they differ, then the shorter* string lexicographically precedes the longer string. In this case,* {@code compareTo} returns the difference of the lengths of the* strings -- that is, the value:* <blockquote><pre>* this.length()-anotherString.length()* </pre></blockquote>** @param   anotherString   the {@code String} to be compared.* @return  the value {@code 0} if the argument string is equal to*          this string; a value less than {@code 0} if this string*          is lexicographically less than the string argument; and a*          value greater than {@code 0} if this string is*          lexicographically greater than the string argument.*/