Java 基础(集合五)

Person.java

package com.klvchen.exer;

public class Person {

    private int id;
    public String name;

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

    public Person() {
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.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;
    }

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

CollectionTest.java

package com.klvchen.exer;

import org.junit.Test;

import java.util.HashSet;

public class CollectionTest {

    @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);

    }
}