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enjoyCoding666enjoyCoding666
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Lines changed: 130 additions & 59 deletions

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‎src/main/java/com/bean/Order.java‎

Lines changed: 8 additions & 59 deletions
Original file line numberDiff line numberDiff line change
@@ -1,71 +1,20 @@
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package com.bean;
22

3-
import lombok.extern.java.Log;
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import lombok.Data;
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/**
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* Created by lenovo on 十一月
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*/
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import java.util.Date;
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@Data
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public class Order {
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private String phoneNumber;
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private String doneCode;
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private String date;
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public Order(String phoneNumber, String doneCode, String date) {
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this.phoneNumber = phoneNumber;
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this.doneCode = doneCode;
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this.date = date;
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}
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private String weight;
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public String getPhoneNumber() {
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return phoneNumber;
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}
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private double price;
2313

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public void setPhoneNumber(String phoneNumber) {
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this.phoneNumber = phoneNumber;
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}
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private int age ;
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public String getDoneCode() {
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return doneCode;
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}
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private String dateStr;
3117

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public void setDoneCode(String doneCode) {
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this.doneCode = doneCode;
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}
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private Date createTime;
3519

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public String getDate() {
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return date;
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}
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public void setDate(String date) {
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this.date = date;
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}
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@Override
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public boolean equals(Object o) {
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if (this == o) {
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return true;
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}
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if (o == null || getClass() != o.getClass()) {
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return false;
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}
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Order order = (Order) o;
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if (!phoneNumber.equals(order.phoneNumber)) {
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return false;
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}
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if (!doneCode.equals(order.doneCode)) {
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return false;
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}
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return date.equals(order.date);
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}
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@Override
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public int hashCode() {
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int result = phoneNumber.hashCode();
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result = 31 * result + doneCode.hashCode();
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result = 31 * result + date.hashCode();
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return result;
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}
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}

‎src/main/java/com/java8/stream/SortedDateDemo.java‎

Lines changed: 72 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,72 @@
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package com.java8.stream;
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3+
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import com.bean.Order;
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import java.time.LocalDateTime;
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import java.time.ZoneId;
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import java.time.format.DateTimeFormatter;
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import java.util.*;
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import java.util.stream.Collectors;
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import static java.util.Comparator.naturalOrder;
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public class SortedDateDemo {
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/**
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* nullsFirst()表示如果属性为null，就放到最前面。
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* nullsFirst()表示如果属性为null，就放到最前面。
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* naturalOrder()表示自然排序(一般是升序)，
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* Comparator.reverseOrder()表示 降序。
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*
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*
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*/
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public void orderSort() {
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Order order1 =new Order();
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order1.setDateStr("2021-10-01 00:00:00");
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order1.setCreateTime(toDate("2022-01-01 00:00:00", "yyyy-MM-dd HH:mm:ss"));
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Order order2 =new Order();
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order2.setDateStr("2021-10-01 00:00:00");
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order2.setCreateTime(toDate("2022-02-01 00:00:00", "yyyy-MM-dd HH:mm:ss"));
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Order order3 =new Order();
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order3.setDateStr("2021-10-03 00:00:00");
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order3.setCreateTime(toDate("2022-02-01 00:00:00", "yyyy-MM-dd HH:mm:ss"));
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Order order4 =new Order();
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order4.setDateStr(null);
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order4.setCreateTime(null);
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List<Order> list= new ArrayList<>();
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list.add(order1);
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list.add(order2);
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list.add(order3);
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list.add(order4);
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//naturalOrder()表示自然排序(一般是升序)，Comparator.nullsLast表示如果属性为null，就放到最后面
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Comparator<Order> comparator = Comparator.comparing(Order::getDateStr, Comparator.nullsLast(naturalOrder()) );
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List<Order> orderList = list.stream().sorted(comparator).collect(Collectors.toList());
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// System.out.println("orderList："+orderList);
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//Comparator.reverseOrder表示 降序，nullsFirst表示如果属性为null，就放到最前面。
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Comparator<Order> comparator2 = Comparator.comparing(Order::getDateStr, Comparator.nullsFirst(Comparator.reverseOrder()));
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List<Order> orderList2 = list.stream().sorted(comparator2).collect(Collectors.toList());
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System.out.println("orderList2："+ orderList2);
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//先按第一个字段降序，再按第二个字段降序，如果属性为null，就放到最后面。
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Comparator<Order> comparator3 = Comparator.comparing(Order::getDateStr, Comparator.nullsLast(Comparator.reverseOrder()))
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.thenComparing(Order::getCreateTime, Comparator.nullsLast(Comparator.reverseOrder()));
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List<Order> orderList3 = list.stream().sorted(comparator3).collect(Collectors.toList());
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// System.out.println("orderList3："+ orderList3);
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}
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public static Date toDate(String dateTimeStr, String pattern) {
66+
DateTimeFormatter formatter = DateTimeFormatter.ofPattern(pattern);
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LocalDateTime localDateTime = LocalDateTime.parse(dateTimeStr, formatter);
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return Date.from(localDateTime.atZone( ZoneId.systemDefault()).toInstant());
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}
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}

‎src/main/java/test/com/java8/stream/SortedDateDemoTest.java‎

Lines changed: 50 additions & 0 deletions
Original file line numberDiff line numberDiff line change
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package test.com.java8.stream;
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import com.java8.stream.SortedDateDemo;
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import org.junit.Assert;
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import org.junit.Test;
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import org.junit.Before;
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import org.junit.After;
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/**
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* SortedDemo Tester.
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*
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* @author <Authors name>
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* @since <pre>3 , 9, 2023</pre>
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* @version 1.0
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*/
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public class SortedDateDemoTest {
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@Before
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public void before() throws Exception {
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}
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@After
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public void after() throws Exception {
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}
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/**
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*
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* Method: orderSort()
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*
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*/
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@Test
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public void testOrderSort() throws Exception {
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//TODO: Test goes here...
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SortedDateDemo sortedDateDemo = new SortedDateDemo();
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sortedDateDemo.orderSort();
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Assert.assertNotNull(sortedDateDemo);
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}
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/**
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*
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* Method: toDate(String dateTimeStr, String pattern)
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*
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*/
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@Test
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public void testToDate() throws Exception {
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//TODO: Test goes here...
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}
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}

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