getInstance()
时间: 2023-11-23 17:07:26 浏览: 25
getInstance() 是一种创建单例模式的方法,它确保只有一个对象实例被创建并提供全局访问点。这个方法通常是在一个单例类中实现的,可以通过调用这个方法获取单例对象的引用。在Java中,getInstance()方法通常使用静态方法实现。例如,对于一个名为MySingleton的单例类,getInstance()方法通常会被实现为:
```
public class MySingleton {
private static MySingleton instance = null;
private MySingleton() {
// private constructor
}
public static MySingleton getInstance() {
if (instance == null) {
instance = new MySingleton();
}
return instance;
}
}
```
这个实现确保只有一个MySingleton实例被创建,并且可以通过MySingleton.getInstance()方法获取该实例的引用。
相关问题
getInstance
`getInstance` is a commonly used static method in object-oriented programming that returns a single instance of a class. This method ensures that only one instance of the class is created and it provides a global point of access to that instance.
For example, in the Singleton design pattern, `getInstance` is used to create a single instance of a class and to provide access to that instance throughout the application.
Here's an example implementation of the `getInstance` method:
```java
public class Singleton {
private static Singleton instance = null;
private Singleton() {
// private constructor to prevent instantiation outside of class
}
public static Singleton getInstance() {
if (instance == null) {
instance = new Singleton();
}
return instance;
}
}
```
In this example, the `Singleton` class has a private constructor to prevent instantiation outside of the class. The `getInstance` method checks whether an instance of the class already exists and creates one if it does not. It then returns the existing or newly created instance.
getinstance
"getInstance" 是一个常用的设计模式中的静态方法,用于获取单例对象。它通常用于创建一个全局唯一的对象实例,以便在应用程序的各个部分共享和访问该对象。在实现时,这个方法通常会使用懒加载技术来确保只有在第一次请求时才会创建对象实例,并且在后续请求中会返回同一个实例。在 Java 中,常见的使用 getInstance 方法的类包括 Calendar、Logger 等。