add a private constructor to hide the implicit public one（Utility classes should not have public constructors）

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add a private constructor to hide the implicit public one（Utility classes should not have public constructors）

sonarlint提示add a private constructor to hide the implicit public one Utility classes should not have public constructors Utility classes, which are collections of static members, are not meant to be instantiated. Even abstract utility classes, which…

C# empty private constructor

A private constructor is a special instance constructor. It is generally used in classes that contain static members only. If a class has one or more private constructors and no public constructors, other classes (except nested classes) cannot create…

Effective Java 03 Enforce the singleton property with a private constructor or an enum type

Principle When implement the singleton pattern please decorate the INSTANCE field with "static final" and decorate the constructor with "private". // Singleton with static factory public class Elvis { private static final Elvis INSTANC…

Effective Java 04 Enforce noninstantiability with a private constructor

A class can be made noninstantiable by including a private constructor. // Noninstantiable utility class public class UtilityClass { // Suppress default constructor for noninstantiability private UtilityClass() { throw new AssertionError(); } ... //…

Effective Java Item4:Enforce noninstantiability with a private constructor

Item4:Enforce noninstantiability with a private constructor 通过构造私有化,禁止对象被实例化. public class UtilClass { private UtilClass(){ //防止类内的函数调用构造函数创建对象 throw new AssertionError(); } }…

Effective Java Item3:Enforce the singleton property with a private constructor or an enum type

Item3:Enforce the singleton property with a private constructor or an enum type 采用枚举类型(ENUM)实现单例模式. public enum Elvis { INSTANCE; public void leaveTheBuiding(){ System.out.println("a single-element enum type is the best way to implement a singleton&q…

Java之创建对象>4.Enforce noninstantiability with a private constructor

如果你定义的类仅仅是包含了一些静态的方法和静态的字段,这些类一般是一些工具类,这些一般是设计为不能被实例化的. 1. Attempting to enforce noninstantiability by making a class abstract does not work. 2. a class can be made noninstantiable by including a private constructor // Noninstantiable utility class p…