java - OOP 解析并将对象添加到列表中

Question

因此，我有三个类，其中 Class1 用于不同的对象。在主类中，创建 Class1 对象并设置名称。主类还创建新的 Household 对象，为家庭指定名称，最后将人员添加到家庭中，如下所示:

HouseholdOne.addPeopleToHousehold(person1);

当前问题不涉及主类。

public class Class1 {
    private String firstName;
    private String middleName;
    private String lastName;

    public String setFirstName(String firstName) {
        return this.firstName = firstName;
    }
    public String setLastName(String lastName) {
        return this.lastName = lastName;
    }
    public String setMiddleName(String middleName) {
        return this.middleName = middleName;
    }
    public String toString() {
        if(firstName == "" && middleName == "" && lastName == "") {
            return "";
        } else if (firstName == null && middleName == null && lastName == null) {
            return null;
        } else
        return firstName + " \"" + middleName + "\" " + lastName;
    }
}

在第二类 Household“addPeopleToHousehold”方法中，应从参数中解析出人员的中间名并将其添加到人员列表中。

我想使用.split函数，但它不适用于对象参数。我怎样才能得到给定的人的中间名和

peopleList.add(personMiddleName)

同样在 Household 类中，toString 应该打印出家庭成员，例如:

成员1、成员2、...、成员x

public class Household {

    List<Class1> peopleList = new ArrayList<>();
    public String householdName;

    public String setHouseholdName(String householdName) {
        return this.householdName = householdName;
    }

    public void addPeopleToHousehold(Class1 people) {
        // implementation needed //
    }

    public int getNumberOfPeople() {
        return people.size();
    }

    public String toString() {
        if (householdName == null || householdName == "") {
            return "" + people;
        }
        return householdName + ": " + people;
    }
}

Answer 1

也许是这样的？很难破译你的帖子，但各种方法的签名说明了很多。我的更改只是添加 people 到 ArrayList peopleList 中。当您打印“家庭”时，它会首先检查是否存在有效的家庭姓名，然后循环“家庭”中的每个人并将其全名添加到列表中。 ((i + 1) != peopleList.size()) 仅用于用 , 分隔姓名，姓氏除外。

更新了Class1。修复了 setter 并添加了中间名的公共(public) getter。

public class Class1 {

    private String firstName;
    private String middleName;
    private String lastName;

    /*
     * Setters
     */

    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }
    public void setLastName(String lastName) {
        this.lastName = lastName;
    }
    public void setMiddleName(String middleName) {
        this.middleName = middleName;
    }

    /*
     * Getters
     */

    public String getMiddleName() {
        return middleName;
    }

    /*
     * toString
     */

    public String toString() {
        if(firstName == "" && middleName == "" && lastName == "") {
            return "";
        } else if (firstName == null && middleName == null && lastName == null) {
            return null;
        } else
        return firstName + " \"" + middleName + "\" " + lastName;
    }
}

更新了Household类。各种修复:

public class Household {

    List<Class1> peopleList = new ArrayList<>();
    public String householdName;

    public String setHouseholdName(String householdName) {
        this.householdName = householdName;
    }

    public void addPeopleToHousehold(Class1 people) {
        peopleList.add(people);
    }

    public int getNumberOfPeople() {
        return peopleList.size();
    }

    public String toString() {
        String returnString = "";
        if (householdName != null) {
            returnString = householdName + ": ";
        }

        // Loop the members
        for (int i = 0; i < peopleList.size(); i++) {
            returnString += peopleList.get(i).getMiddleName();
            if ((i + 1) != peopleList.size()) {
                returnString += ", ";
            }
        }

        return returnString;
    }
}