package top.qaqaq.java.P547;

import org.junit.jupiter.api.Test;

import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;

/**
 * @author RichieZhang
 * @create 2022-10-27 下午 4:10
 */
public class CollectionTest {

    //练习：在List内去除重复数字值，要求尽量简单
    public static List duplicateList(List list) {
        HashSet set = new HashSet();
        set.addAll(list);
        return new ArrayList(set);
    }

    @Test
    public void test2() {
        List list = new ArrayList();
        list.add(new Integer(1));
        list.add(new Integer(2));
        list.add(new Integer(2));
        list.add(new Integer(4));
        list.add(new Integer(4));
        List list2 = duplicateList(list);
        for (Object integer : list2) {
            System.out.println(integer);
        }
    }

    @Test
    public void test3(){
        HashSet set = new HashSet();
        Person p1 = new Person(1001,"AA");
        Person p2 = new Person(1002,"BB");
        set.add(p1);
        set.add(p2);
        System.out.println(set);

        p1.name = "CC";
        set.remove(p1);
        System.out.println(set);
        set.add(new Person(1001,"CC"));
        System.out.println(set);
        set.add(new Person(1001,"AA"));
        System.out.println(set);
    }

}

package top.qaqaq.java.P547;

/**
 * @author RichieZhang
 * @create 2022-10-27 下午 4:14
 */
public class Person {

    int id;
    String name;

    public Person() {
    }

    public Person(int id, String name) {
        this.id = id;
        this.name = name;
    }

    @Override
    public String toString() {
        return "Person{" +
                "id=" + id +
                ", name='" + name + '\'' +
                '}';
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;

        Person person = (Person) o;

        if (id != person.id) return false;
        return name != null ? name.equals(person.name) : person.name == null;
    }

    @Override
    public int hashCode() {
        int result = id;
        result = 31 * result + (name != null ? name.hashCode() : 0);
        return result;
    }
}