枚举类型排序

1.对于数组的排序方法如下：String[] names = {"王林", "杨宝", "李镇", "刘迪", "刘波"};
Arrays.sort(names, com.ibm.icu.text.Collator.getInstance(com.ibm.icu.util.ULocale.SIMPLIFIED_CHINESE));//升序;
System.out.println(Arrays.toString(names)); 2.对于汉字的排序：可以尝试使用ICU4J会得到更好的结果，特别是姓为某些生僻字的时候，用com.ibm.icu.text.Collator替换java.text.Collator，用com.ibm.icu.util.ULocale替换java.util.Locale3.对于枚举类型的enum1.compareTo（enum2）是按照枚举类型值在定义时的先后顺序比较的，越后面的越大，而不是按照值的字母先后顺序比较的。public class Test {

public static void main(String[] args) {

List <Map<String,Object>>totallist = new ArrayList<Map<String,Object>>();
Map<String,Object> map = new HashMap<String,Object>();
map.put("PaymentType", PayType.S);
Map<String,Object> map1 = new HashMap<String,Object>();
map1.put("PaymentType", PayType.E);
Map<String,Object> map2 = new HashMap<String,Object>();
map2.put("PaymentType", PayType.Z);
totallist.add(map);
totallist.add(map1);
totallist.add(map2);

Collections.sort(totallist,new Comparator<Map<String,Object>>() {
public int compare(Map<String,Object> arg0, Map <String,Object>arg1) {
PayType t0 =(PayType) arg0.get("PaymentType");
PayType t1 = (PayType)arg1.get("PaymentType");
return t1.compareTo(t0);
}
});

System.out.println(totallist);

}

public enum PayType {
W,
S,
E,
Z;
}

}
打印结果如下：

[{PaymentType=Z}, {PaymentType=E}, {PaymentType=S}]