Java自定义比较器实现中文排序

Comparator<String> comparator = new Comparator<String>() {
 @Override
 public int compare(String s1, String s2) {
 return s1.compareTo(s2);
 }
};

@Test
public void testCompare() {
 List<String> list = new ArrayList<>();
 list.add("java");
 list.add("php");
 list.add("c++");
 System.out.println("排序前-->" + list);

 Comparator<String> comparator = new Comparator<String>() {
 @Override
 public int compare(String s1, String s2) {
  return s1.compareTo(s2);
 }
 };

 Collections.sort(list, comparator);

 System.out.println("排序后-->" + list);
 Collections.reverse(list);
 System.out.println("排序后逆序-->" + list);
}

@Test
public void testCompareCN() {
 List<String> list = new ArrayList<>();
 list.add("中国");// 中->20013 unicode编码的4E2D
 list.add("英国");// 英-->33521 unicode编码的82F1
 list.add("美国");// 美->32654 unicode编码的7F8E
 // 汉字unicode编码表 http://www.chi2ko.com/tool/CJK.htm
 System.out.println("排序前-->" + list);

 Comparator<String> comparator = new Comparator<String>() {
 @Override
 public int compare(String s1, String s2) {
  int b = s1.compareTo(s2);
  return b;
 }
 };

 Collections.sort(list, comparator);

 System.out.println("排序后-->" + list);
 Collections.reverse(list);
 System.out.println("排序后逆序-->" + list);

 // 输出字符编码对应的十进制
 //char a = '美';
 //System.out.println((int) a);
}

@Test
public void testCollator() {
 List<String> list = new ArrayList<>();
 list.add("中国");
 list.add("英国");
 list.add("美国");
 System.out.println("排序前-->" + list);
 Collections.sort(list, new Comparator<String>() {
 @Override
 public int compare(String s1, String s2) {
  String o1 = "";
  String o2 = "";
  if (s1 != null) {
  o1 = s1;
  }
  if (s2 != null) {
  o2 = s2;
  }
  Collator instance = Collator.getInstance(Locale.CHINA);
  return instance.compare(o1, o2);
 }
 });

 System.out.println("排序后-->" + list);
 Collections.reverse(list);
 System.out.println("排序后逆序-->" + list);

}

public static class 类名 implements Comparator{
    @Override
    public int compare(Object o1, Object o2) {
      // TODO Auto-generated method stub
      return o1 - o2;//升序
      //return o2 - o1;降序
    }
}

package test;
import java.util.Comparator;
import java.util.TreeSet;
public class 比较器的使用 {

  public static class Book{
    String name;
    int price;

    public Book(String name, int price) {
      this.name = name;
      this.price = price;
    }

    @Override
    public String toString() {
      // TODO Auto-generated method stub
      return "Book:" + name + "  Price:" + price;
    }
  }

  /**
   * 
   * @author Administrator
   * 升序比较器，降序只要将b1,b2换个顺序即可
   */
  public static class MyComparator implements Comparator{

    @Override
    public int compare(Object o1, Object o2) {
      // TODO Auto-generated method stub
      Book b1 = (Book) o1;
      Book b2 = (Book) o2;
      return b1.price - b2.price;
    }

}
  public static void main(String[] args) {

    TreeSet<Book> treeset = new TreeSet<Book>(new MyComparator());
    treeset.add(new Book("动物世界",50));
    treeset.add(new Book("时间简史",25));
    treeset.add(new Book("探索发现",60));
    treeset.add(new Book("恐龙时代",20));

    System.out.println(treeset);
  }
}