Java 1.8 list 排序

package com.bugyun.po;


public class Student {

    private String name;
    private Integer age;
    private Float score ;
    
    
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public Integer getAge() {
		return age;
	}
	public void setAge(Integer age) {
		this.age = age;
	}
	public Float getScore() {
		return score;
	}
	public void setScore(Float score) {
		this.score = score;
	}
	
	
	public Student(String name, Integer age, Float score) {
		super();
		this.name = name;
		this.age = age;
		this.score = score;
	}
	
	
	@Override
	public String toString() {
		return "Student [name=" + name + ", age=" + age + ", score=" + score + "]";
	}
      
}

 

 

ListSort.java

package com.bugyun.demo;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;

import com.bugyun.po.Student;
import com.google.common.collect.Lists;

/**
 * 
 * list 排序
 * 1. 通过 Lambda 排序
 * 2. 通过 初始化 方法
 * 
 * @author Administrator
 */
public class ListSort {

	public static void main(String[] args) throws Exception {
		ListSort listSort = new ListSort();
		
		Student one = new Student("liKui", 22, 65.0f);
		Student two = new Student("songJiang", 55, 71.0f);
		Student three = new Student("wuSong", 45, 80.0f);
		Student four = new Student("sunErNiang", 80, 98f);
		Student five = new Student("liGui", 22, 19.0f);

		List<Student> humanList = new ArrayList<>();
		humanList.add(one);
		humanList.add(two);
		humanList.add(three);
		humanList.add(four);
		humanList.add(five);
		
		
		ArrayList<Student> humanListTwo = Lists.newArrayList(one, two, three, four, five);
		
		listSort.sortByAgeWithLambda(humanList);
		listSort.sortByAgeWithInstanceMethod(humanList);
		listSort.sortByAgeScoreWithComparator(humanList);
		
//		listSort.sortByAgeWithLambda(humanListTwo);
//		listSort.sortByAgeWithInstanceMethod(humanListTwo);
//		listSort.sortByAgeScoreWithComparator(humanListTwo);
	}
	
	
	/**
	 * 通过 Lambda 对学生年龄进行排序
	 * @param humanList
	 * @throws Exception
	 */
	public void sortByAgeWithLambda(List<Student> humanList) throws Exception {

		System.out.println("\n----------美丽的分割线----------");
		
		humanList.sort((Student h1, Student h2) -> h1.getAge().compareTo(h2.getAge()));
		
		printList(humanList);

	}

	/**
	 * 通过 默认方法  对学生年龄进行排序
	 * @param humanList
	 * @throws Exception
	 */
	public void sortByAgeWithInstanceMethod(List<Student> humanList) throws Exception {

		System.out.println("\n----------美丽的分割线----------");
		
		Collections.sort(humanList, Comparator.comparing(Student::getAge));
		printList(humanList);
	}
	

	public void sortByAgeScoreWithComparator(List<Student> humanList) throws Exception {
		System.out.println("\n----------美丽的分割线----------");
		
		Comparator<Student> comparator = (h1, h2) -> {
			if (h1.getAge().equals(h2.getAge())) {
				return Float.compare(h1.getScore(), h2.getScore());
			}
			return h1.getAge().compareTo(h2.getAge());
		};
		
		humanList.sort(comparator);
		printList(humanList);
	}

	
	private void printList(List<Student> humanList) {
		for (Student human : humanList) {
			System.out.println(human);
		}
		/**
		 *  对集合洗牌，打乱顺序
		 */
		Collections.shuffle(humanList);
	}
	
	
}