package com.example.google.guava.demo.clazz;

import com.google.common.collect.Ordering;

import java.util.ArrayList;

import java.util.Collections;

import java.util.List;

/**

 * <p>

 * <code>OrderingTest</code>

 * </p>

 * Description:

 *

 * @author Mcchu

 * @date 2017/10/18 16:54

 */

public class OrderingTest {

    public static void main(String[] args) {

        List<Integer> numList = new ArrayList<>();

        numList.add(5);

        numList.add(30);

        numList.add(25);

        numList.add(10);

        numList.add(15);

        System.out.println("排序前："+numList);

        // 1. 自然排序，由小到大

        Ordering ordering = Ordering.natural();

        Collections.sort(numList,ordering);

        System.out.println("自然排序："+numList);

        // 2. 判断是否有序，最小值，最大值

        Boolean bol = ordering.isOrdered(numList);

        Integer minValue = (Integer) ordering.min(numList);

        Integer maxValue = (Integer) ordering.max(numList);

        System.out.println("是否已排序："+bol);

        System.out.println("最小值："+minValue);

        System.out.println("最大值："+maxValue);

        // 3. 反序

        Collections.sort(numList,ordering.reverse());

        System.out.println("反序排列："+numList);

        // 4. 添加一个 null 值

        numList.add(null);

        System.out.println("添加null值后："+numList);

        // 5.null 存放在前、后

        Collections.sort(numList,ordering.nullsFirst());

        System.out.println("null在前："+numList);

        Collections.sort(numList,ordering.nullsLast());

        System.out.println("null在后："+numList);

        System.out.println("===========================");

        // 6. 字符串 null

        List<String> names = new ArrayList<String>();

        names.add("Ram");

        names.add("Shyam");

        names.add("Mohan");

        names.add("Sohan");

        names.add("Ramesh");

        names.add("Suresh");

        names.add("Naresh");

        names.add("Mahesh");

        names.add(null);

        names.add("Vikas");

        names.add("Deepak");

        System.out.println("排序前："+names);

        Collections.sort(names,ordering.nullsFirst().reverse());

        System.out.println("排序后："+names);

    }

}