java数组多个字段排序

import java.text.Collator;
import java.util.Comparator;
import java.util.Map;

public class CommonComparator implements Comparator<Map> {
private String[] fields = null;
static Collator cmp = Collator.getInstance(java.util.Locale.CHINA);  
public int compare(Map obj1, Map obj2){
// 没有属性，则不排序
if(fields == null || fields.length <= 0){
return 2;// 不比较
}
for(int i = 0; i < fields.length; i++) {
if (compareField(obj1, obj2, fields[i]) > 0) {// 如果obj1的属性值大于obj2的属性值，则返回正数
return 1;
} else if (compareField(obj1, obj2, fields[i]) < 0) {
return -1;
}
}
return 0;
}


private static int compareField(Map o1, Map o2, String fieldName) {
try {
Object value1 = o1.get(fieldName);
Object value2 = o2.get(fieldName);
// --字符串比较
if((value1 instanceof String)&&(value2 instanceof String)){
if (cmp.compare(value1, value2)>0){  
return 1;  
}else if (cmp.compare(value1,value2)<0){  
return -1;  
}  
}if((value1 instanceof Integer)&&(value2 instanceof Integer)){
return (Integer)value1 - (Integer)value2;  
}else{
if(value1 == null&&value2!=null){
return 1;
}else if(value1!=null&&value2==null){
return -1;
}else{
return 0;
}
}

} catch (Exception e) {
e.printStackTrace();
}
// 小于
return 0;
}

public String[] getFields() {
return fields;
}

public void setFields(String[] fields) {
this.fields = fields;
}

}

//调用main();

List<Map> list = new ArrayList<Map>();
Map map = new HashMap();
map.put("姓名","阿毛");
map.put("年龄",null);
list.add(map);
map = new HashMap();
map.put("姓名","白菜");
map.put("年龄",18);
list.add(map);
map = new HashMap();
map.put("姓名","菜花");
map.put("年龄",35);
list.add(map);
map = new HashMap();
map.put("姓名","花菜");
map.put("年龄",23);
list.add(map);
map = new HashMap();
map.put("姓名","李四");
map.put("年龄",null);
list.add(map);
map = new HashMap();
map.put("姓名","张三");
map.put("年龄",15);
list.add(map);
map = new HashMap();
map.put("姓名","王武");
map.put("年龄",null);
list.add(map);
/*String[] fields = new String[]{"年龄"};
Collections.sort(list, new SortChineseUtil(fields));
String[] fields2 = new String[]{"姓名"};
Collections.sort(list, new SortChineseUtil(fields2));*/
CommonComparator comparator = new CommonComparator();
comparator.setFields(new String[]{"年龄","姓名"});
Collections.sort(list, comparator);
for(Map obj : list){
System.out.println(obj.get("姓名"));
}