請問在HashSet集合中存入同一對象，在哈希值相同情況下為什么沒有調(diào)用equals方法呢？

Person類中重寫了hashCode 跟equals方法，在HashSet集合中添加兩次同一對象時在比較得知哈希值相等的時候為什么沒有調(diào)用equals方法比較就認(rèn)為元素已經(jīng)存在了呢？

public class Person {
    private String name;
    private int age;
    
    public Person(String name, int age) {
        this.name = name;
        this.age = age;
    }
    public Person() {
    }
    get、set方法省略...
    @Override
    public int hashCode() {
        int hashCode = this.name.hashCode() + this.age * 27;
        System.out.println(this + "....hashCode" + hashCode);
        return hashCode; 
    }
    @Override
    public boolean equals(Object obj) {
        Person p = (Person) obj;
        System.out.println(this + "...equals..." + p);
        return this.name.equals(p.name) && this.age == p.age;
    }
    @Override
    public String toString() {
        return this.name + "," + this.age;
    }

測試類代碼：

public class HashSetTest {

    public static void main(String[] args) {
        HashSet hs = new HashSet();
        Person ps = new Person("test", 21);

        hs.add(ps);
        hs.add(ps);

        for (Iterator it = hs.iterator(); it.hasNext(); ) {
            Person p = (Person) it.next();
            System.out.println(p.getName() + "," + p.getAge());
        }
    }

}

結(jié)果：

test,21....hashCode3557065
test,21....hashCode3557065
test,21