中文排序

中文排序

1 数组、集合排序

package zys.bd.cg.sheets;

import java.text.Collator;
import java.util.Arrays;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import java.util.Locale;

public class ChineseSortCompare {

    @SuppressWarnings("rawtypes")
    private final static Comparator CHINA_COMPARE = Collator.getInstance(Locale.CHINA);

    public static void main(String []args) {
        sortArray();
        sortList();
        System.out.println("李四".compareTo("张三"));//前者大于后者，则为正数，否则为负数，相等为0
    }

    @SuppressWarnings("unchecked")
    private static void sortList() {
        List<String>list = Arrays.asList("张三", "李四", "王五");
        Collections.sort(list , CHINA_COMPARE);
        for(String str : list) {
            System.out.println(str);
        }
    }

    @SuppressWarnings("unchecked")
    private static void sortArray() {
        String[] arr = {"张三", "李四", "王五"};
        Arrays.sort(arr, CHINA_COMPARE);
        for(String str : arr) {
            System.out.println(str);
        }
    }
}

2 对象排序

//UserDo
package zys.bd.cg.sheets;

public class UserDO {

     protected String name;

        protected String email;

        public UserDO() {}

        public UserDO(String name , String email) {
            this.name = name;
            this.email = email;
        }

        public String getName() {
            return name;
        }

        public void setName(String name) {
            this.name = name;
        }

        public String getEmail() {
            return email;
        }

        public void setEmail(String email) {
            this.email = email;
        }
}

//比较器；如果第一个字段相同，再比较第二个字段；
package zys.bd.cg.sheets;

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

public class UserDOComparator implements Comparator<UserDO>{

     Collator cmp = Collator.getInstance(java.util.Locale.CHINA);

        @Override
        public int compare(UserDO userDO1, UserDO userDO2) { 
            int sign = cmp.compare(userDO1.getName(), userDO2.getName());
            return sign == 0 ? cmp.compare(userDO1.getEmail(), userDO2.getEmail()) : sign;
        }
}

//main方法
package zys.bd.cg.sheets;

import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.SortedSet;
import java.util.TreeSet;

public class SortUserListTest {

    private final static UserDOComparator USER_COMPARATOR = new UserDOComparator();

    public static void main(String []args) {
        sortUserBySortedSet();
        sortUserDOList();
        sortUserDOArray();
    }

    private static void sortUserBySortedSet() {
        SortedSet<UserDO>userSet = new TreeSet<UserDO>(USER_COMPARATOR);
        userSet.add(new UserDO("李四" , "baazhangsan@ddd.com"));
        userSet.add(new UserDO("李四" , "adlisi@dsfds.com"));
        userSet.add(new UserDO("王五" , "ddwangwu@fsadfads.com"));
        for(UserDO userDO : userSet) {
            System.out.println(userDO.getName()+":"+userDO.getEmail());
        }
    }

    private static void sortUserDOList() {
        List<UserDO>list = Arrays.asList(
                new UserDO("张三" , "aaazhangsan@ddd.com"),
                new UserDO("李四" , "ddlisi@dsfds.com"),
                new UserDO("王五" , "ddwangwu@fsadfads.com")
        );
        Collections.sort(list , USER_COMPARATOR);
        for(UserDO userDO : list) {
            System.out.println(userDO.getName());
        }
    }

    private static void sortUserDOArray() {
        UserDO []userDOArray = new UserDO[] {
            new UserDO("张三" , "aaazhangsan@ddd.com"),
            new UserDO("李四" , "ddlisi@dsfds.com"),
            new UserDO("王五" , "ddwangwu@fsadfads.com")
        };
        Arrays.sort(userDOArray , USER_COMPARATOR);
        for(UserDO userDO : userDOArray) {
            System.out.println(userDO.getName());
        }
    }
}