ListBean 排序

List<Bean> 简单排序如下：

1.创建Bean

package com.nzh.Demo.entity;



/**
 * @comment:学生实体类
 * @author 傅里叶级数
 * @date 2018年
 */
public class StudentsBean {

	/**
	 * 身高
	 */
	private float height;
	/**
	 * 年龄
	 */
	private int age;
	/**
	 * 血型
	 */
	private String bloodType;
	/**
	 * 姓名
	 */
	private String name;
	/**
	 * 性别
	 */
	private String sex;
	public float getHeight() {
		return height;
	}
	public void setHeight(float height) {
		this.height = height;
	}
	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}
	public String getBloodType() {
		return bloodType;
	}
	public void setBloodType(String bloodType) {
		this.bloodType = bloodType;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getSex() {
		return sex;
	}
	public void setSex(String sex) {
		this.sex = sex;
	}
}

2.写排序的Demo

package com.nzh.Demo;

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

import com.nzh.Demo.entity.StudentsBean;

public class StudentDemo {

	public static void main(String[] args) {
		/**
		 * 声明学生实体
		 */
		StudentsBean student1 = new StudentsBean();
		StudentsBean student2 = new StudentsBean();
		StudentsBean student3 = new StudentsBean();
		StudentsBean student4 = new StudentsBean();
		
		/**
		 * 赋值
		 */
		student1.setName("张三");
		student1.setSex("男");
		student1.setAge(12);
		student1.setBloodType("B");
		student1.setHeight(180);
		
		
		student2.setName("李四");
		student2.setSex("男");
		student2.setAge(34);
		student2.setBloodType("O");
		student2.setHeight(183);
		
		
		student3.setName("王五");
		student3.setSex("女");
		student3.setAge(32);
		student3.setBloodType("A");
		student3.setHeight(179);
		
		
		student4.setName("赵六");
		student4.setSex("女");
		student4.setAge(24);
		student4.setBloodType("AB");
		student4.setHeight(175);
		
		List<StudentsBean> listStd = new ArrayList<>();
		listStd.add(student1);
		listStd.add(student2);
		listStd.add(student3);
		listStd.add(student4);


		listBeanSort(listStd);
		printlnStuData(listStd);
	}

	
	
	
	
	
	
	
	/**
	 * 打印学生数据
	 */
	public static void printlnStuData(List<StudentsBean> listStd){
		System.out.println("学生数据如下：");
		for (StudentsBean stu : listStd) {
			System.out.println("姓名："+stu.getName()+"    性别:"+stu.getSex()+"    年龄:"+stu.getAge()+"    血型:"+stu.getBloodType()+"    身高:"+stu.getHeight());
		}
	}
	
	
	
	/**
	 * @comment:ListBean 排序
	 * @author:傅里叶级数
	 * @date:2018年
	 * @param listStd
	 */
	public static void listBeanSort(List<StudentsBean> listStd){
		Collections.sort(listStd,new Comparator<StudentsBean>() {
			@Override
			public int compare(StudentsBean o1, StudentsBean o2) {
//				// 按照年龄升序排列
//				return o1.getAge()-o2.getAge();
//				// 按照年龄降序排列
//				return o1.getAge()-o2.getAge();
				// 按照身高排序，需要将float类型转换为int类型再排序，如果为String类型的数字，也需要将String类型的数字转换为int类型
				int high1 = (int)o1.getHeight(); 
				int high2 = (int)o2.getHeight(); 
				return high1-high2;
			}
		});
	}
}