类中重载的构造函数

Question

null

我不太确定如何处理我的代码，以下是我得到的：

public class Person {
    int age;
    Name aPersonHasAName;
    Name newPerson = new Name();

    public Person(String firstName, String middleName, String lastName, int age) {
        newPerson.firstName = firstName;
        newPerson.middleName = middleName;
        newPerson.lastName = lastName;
    }

    public Person(Name aPersonHasAName, int age) {

    }

    public void details() {
        System.out.println(aPersonHasAName + " age: " + age);
    }

}

我只是不知道我应该打什么。我相信我已经完成了第一个重载构造函数，但我对此还是新手。

那么，我应该做些什么来使重载构造函数工作呢？

public class PersonTester {
        public static void main(String[] args) {
            Person person1 = new Person("a1", "b1", "c1", 11);
            Person person2 = new Person(new Name("a2", "b2", "c2"), 22);
            Person person3 = new Person(new Name("a3", "c3"), 33);
            Person person4 = new Person(new Name("a4"), 44);
            Person person5 = new Person(new Name(), 55);
            System.out.println(person1.details());
            System.out.println(person2.details());
            System.out.println(person3.details());
            System.out.println(person4.details());
            System.out.println(person5.details());
    }
}

public Name(String firstName, String middleName, String lastName) {
    this.firstName = firstName;
    this.middleName = middleName;
    this.lastName = lastName;
}

public Name(String firstName, String lastName) {
    this(firstName, "", lastName);
}

public Name(String firstName) {
    this(firstName, "", "");
}

public Name() {
    this("", "", "");
}

public String getLastName() {
    return lastName;
}

public String getMiddleName() {
    return middleName;
}

public String getFirstName() {
    return firstName;
}

public String getFullName(String nameString) {
    StringBuilder build = new StringBuilder();
    build.append(nameString);
    build.deleteCharAt(nameString.length() - 1);
    build.insert(0, build.hashCode());
    return build.toString();
}

}

我对Java和面向对象编程非常陌生。

Answer 1

到目前为止还好。但最终您会达到复制相当一部分代码的地步。

构造函数

公共人物（字符串名、字符串名、字符串名、整数名）{

public Person(String lastName, int age) {
   this(null, null, lastName, age); /*calls the other constructor*/
}