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？
最佳答案
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
关于java - 根据 boolean 值制作2个构造函数，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/40829994/