Java Collections.sort()实现List排序的默认方法和自定义方法

List<String> list = new ArrayList();list.add("刘媛媛");list.add("王硕");list.add("李明");list.add("刘迪");list.add("刘布");//升序Collections.sort(list,Collator.getInstance(java.util.Locale.CHINA));//注意：是根据的汉字的拼音的字母排序的，而不是根据汉字一般的排序方法for(int i=0;i<list.size();i++){ System.out.print(list.get(i));}System.out.println("");//降序Collections.reverse(list);//不指定排序规则时，也是按照字母的来排序的for(int i=0;i<list.size();i++){  System.out.print(list.get(i));}

public class StudentDTO implements Comparable{ private String name; private int age;public String getName(){ return name;}public void setName(String name){  this.name = name;}public ObjType getType(){ return type;}public void setAge(int age){  this.age= age;}@Overridepublic int compareTo(Object o){  StudentDTO sdto = (StudentDTO)o;  int otherAge = sdto.getAge();  // note: enum-type's comparation depend on types' list order of enum method  // so, if compared property is enum-type ,then its comparationfollow ObjEnum.objType order  return this.age.compareTo(otherAge);}}   主方法：   public static void main(String[] args){  List<StudentDTO> studentList = new ArrayList();  StudentDTO s1 = new StudentDTO ();  s.setName("yuanyuan");  s.setAge(22);  studentList.add(s1);     StudentDTO s1 = new StudentDTO ();     s.setName("lily");     s.setAge(23);     studentList.add(s2);     Collections.sort(studentList); //按照age升序 22，23，     Collections.reverse(studentList); //按照age降序 23,22 }

public class StudentDTO implements Comparable{  private String name;  private int age;  public String getName()  {   return name;  }  public void setName(String name) {   this.name = name;  }  public ObjType getType()  {   return type;  }  public void setAge(int age)  {   this.age= age;  }}    比较器类：class MyCompartor implements Comparator{  @Override  public int compare(Object o1, Object o2) {   StudentDTO sdto1= (StudentDTO )o1;   StudentDTO sdto2= (StudentDTO )o2;   return sdto1.getAge.compareTo(stdo2.getAge()) }}   主方法：public static void main(String[] args){  List<StudentDTO> studentList = new ArrayList();  StudentDTO s1 = new StudentDTO ();  s.setName("yuanyuan");  s.setAge(22);  studentList.add(s1);  StudentDTO s1 = new StudentDTO ();  s.setName("lily");  s.setAge(23);  studentList.add(s2);  MyComparetor mc = new MyComparetor();  Collections.sort(studentList,mc);  //按照age升序 22，23，  Collections.reverse(studentList,mc); //按照age降序 23,22 }

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));