java - 根据 boolean 值制作2个构造函数

Question

这是一个非常简单的问题。我正在为我的应用制作一个简单的 Java 对象，如下所示:

public class Category{
    // STATE
    private String mCategoryName;
    private Boolean mContainsSubcategories;
    private Subcategory[] mSubcategoryList; // Subcategory is another object
    // Constructor
    // for mContainsSubcategories == false, use the below constructor
    public Category(String categoryName, Boolean containsSubcategories){

    }
    // for mContainsSubcategories == true, use the below constructor
    public Category(String categoryName, Boolean containsSubcategories, Subcategory[] subcategoryList){

    }

    // GETTER METHODS
    /* ..................... */
}

基本上，我想要的是根据 boolean 值使用不同的构造函数。如果 boolean 值为真，则使用一个构造函数，如果为假，则使用另一个构造函数。我该怎么做？

Answer 1

创建一个 getinstance 方法:

public class Category{

    // STATE
    private String mCategoryName;
    private Boolean mContainsSubcategories;
    private Subcategory[] mSubcategoryList; // Subcategory is another object
    // Constructor
    public static Category getInstance(boolean mContainsSubcategories,String mCategoryName, Subcategory[] subcategoryList) {
        if (mContainsSubcategories){
            return new Category(mCategoryName);
        }else {
            return new Category(mCategoryName,subcategoryList);
        }
    }
    // for mContainsSubcategories == false, use the below constructor
    public Category(String categoryName){

    }
    // for mContainsSubcategories == true, use the below constructor
    public Category(String categoryName, Subcategory[] subcategoryList){

    }

    // GETTER METHODS
    /* ..................... */
}

并初始化它使用:

Category myCategory =    
      Category.getInstance(mContainsSubcategories,mCategoryName,subcategoryList); 
                  //instead of new Category