`

connections.sort 方法使用

 
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Collections.sort(performers, new Comparator<Performer>() {
				public int compare(Performer o1, Performer o2) {
					return o1.getSortId().compareTo(o2.getSortId());
				}
			});
   此时的比较o1,o2对象之间的属性,按照字母自然顺序比较 比如:a,b,c,d
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