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del util
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@@ -1,179 +0,0 @@
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package cn.hutool.core.util;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.List;
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import java.util.Map;
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import java.util.Set;
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import java.util.stream.Collectors;
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import org.junit.Assert;
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import org.junit.Test;
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/**
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* @author yiming
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* @date 2020/9/4 13:40
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*/
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public class StreamUtilTest {
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static List<User> userList = Arrays.asList(
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new User(1L, "A", 3, true, true, true),
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new User(2L, "B", 4, true, true, false),
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new User(3L, "C", 5, true, false, true),
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new User(4L, "E", 6, true, false, false),
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new User(5L, "D", 7, false, true, true),
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new User(6L, "F", 7, false, false, true),
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new User(7L, "G", 8, false, true, false),
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new User(8L, "H", 8, false, false, false)
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);
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@Test
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public void testList() {
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List<Long> userIds = StreamUtil.list(userList, User::getId);
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Assert.assertEquals(userIds.size(), userList.size());
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}
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@Test
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public void testListFilter() {
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// 提取管理员用户名称
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List<String> names = StreamUtil.list(userList, User::getName, x -> Boolean.TRUE.equals(x.isAdmin));
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Assert.assertEquals(names.size(), 4);
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}
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@Test
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public void testToSet() {
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Set<Integer> ages = StreamUtil.toSet(userList, User::getAge);
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Assert.assertEquals(ages.size(), 6);
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}
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@Test
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public void testToSetFilter() {
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// 提取大于6的元素
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Set<Integer> ages = StreamUtil.toSet(userList, User::getAge, x -> x.getAge() > 6);
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Assert.assertEquals(ages.size(), 2);
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}
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@Test
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public void testToMap() {
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Map<Long, User> userMap = StreamUtil.toMap(userList, User::getId);
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Assert.assertEquals(userMap.size(), userList.size());
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}
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@Test
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public void testToMapValue() {
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Map<Long, String> userNameMap = StreamUtil.toMap(userList, User::getId, User::getName);
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Assert.assertEquals(userNameMap.size(), userList.size());
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}
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@Test
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public void testToMapFilter() {
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// 提取年龄>5的用户姓名map
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Map<Long, String> userNameMap = StreamUtil.toMap(userList, User::getId, User::getName, x -> x.getAge() > 5);
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Assert.assertEquals(userNameMap.size(), 5);
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}
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@Test
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public void testToMapMerge() {
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// 提取用户姓名map - 自定义map的value覆盖策略
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User tempUser1 = new User(10L, "X", 10, true, false, false);
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User tempUser2 = new User(10L, "Y", 10, true, false, false);
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List<User> users = new ArrayList<>();
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users.add(tempUser1);
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users.add(tempUser2);
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// 若新的value同原value,取原value
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Map<Long, String> userNameMap = StreamUtil.toMap(users, User::getId, User::getName, (v1, v2) -> v1);
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Assert.assertEquals(userNameMap.get(10L), "X");
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// 若新的value同原value,取新value
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userNameMap = StreamUtil.toMap(users, User::getId, User::getName, (v1, v2) -> v2);
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Assert.assertEquals(userNameMap.get(10L), "Y");
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}
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@Test
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public void groupingBy() {
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// 按年龄分组
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Map<Integer, List<User>> ageGroupMap = StreamUtil.groupingBy(userList, User::getAge);
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Assert.assertEquals(ageGroupMap.size(), 6);
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}
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/**
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* 测试bean
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*/
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public static class User {
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private Long id;
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private String name;
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private int age;
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private boolean isAdmin;
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private boolean isSuper;
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private boolean gender;
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public User() {
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}
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public User(Long id, String name, int age, boolean isAdmin, boolean isSuper, boolean gender) {
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this.id = id;
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this.name = name;
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this.age = age;
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this.isAdmin = isAdmin;
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this.isSuper = isSuper;
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this.gender = gender;
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}
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public Long getId() {
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return id;
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}
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public void setId(Long id) {
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this.id = id;
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}
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public String getName() {
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return name;
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}
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public void setName(String name) {
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this.name = name;
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}
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public int getAge() {
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return age;
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}
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public User setAge(int age) {
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this.age = age;
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return this;
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}
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public String testMethod() {
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return "test for " + this.name;
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}
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public boolean isAdmin() {
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return isAdmin;
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}
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public void setAdmin(boolean isAdmin) {
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this.isAdmin = isAdmin;
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}
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public boolean isIsSuper() {
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return isSuper;
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}
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public void setIsSuper(boolean isSuper) {
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this.isSuper = isSuper;
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}
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public boolean isGender() {
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return gender;
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}
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public void setGender(boolean gender) {
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this.gender = gender;
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}
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@Override
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public String toString() {
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return "User [name=" + name + ", age=" + age + ", isAdmin=" + isAdmin + ", gender=" + gender + "]";
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}
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}
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}
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