public class Singleton { private Singleton() {} privatestatic classSingletonHolder { private static final Singleton INSTANCE = new Singleton(); } public static Singleton getInstance() { return SingletonHolder.INSTANCE; } } 详细代码解析 SingletonHolder是一个静态内部类,包含了Singleton的唯一实例; 在getIn...
packagecom.example;importjava.io.*;publicclasstest{publicstaticvoidmain(String[] args)throwsIOException, ClassNotFoundException {singleton_testinstance=singleton_test.getInstance();ObjectOutputStreamoos=newObjectOutputStream(newFileOutputStream("text.txt"));oos.writeObject(instance);Filefile=newFile("text....
1.单例模式(Singleton Pattern) 单例模式约束了一个类的实例化并且确保在JVM中只会存在一个类的实例。这个看起来非常简单的设计模式但是在实现起来的时候会带来很多的实现问题。单例模式的实现在开发中中通常是一个有争议性的话题。看下Singleton Design Pattern文章来了解到实现单例模式的不同方法还有每个方法的优点...
1. Singleton Pattern The singleton pattern restricts the instantiation of aClassand ensures that only one instance of the class exists in the Java Virtual Machine. The implementation of the singleton pattern has always been a controversial topic among developers. Note:Learn more about theSingleton De...
public class AdapterPatternExample { public static void main(String[] args) { LegacyRectangle legacyRectangle = new LegacyRectangle(); Shape shapeAdapter = new RectangleAdapter(legacyRectangle); shapeAdapter.draw(10, 20, 50, 30); } } 7. 桥接模式(Bridge) 问题: 在软件设计中,有时候你会遇到...
public class DecoratorPatternExample { public static void main(String[] args) { Coffee simpleCoffee = new SimpleCoffee(); System.out.println("Cost: $" + simpleCoffee.cost() + ", Description: " + simpleCoffee.description()); Coffee milkCoffee = new MilkDecorator(simpleCoffee); System.out....
传统课本上单例模式分两种,一种饿汉式,一种懒汉式。对应的代码如下:懒汉式/*** 懒汉模式* 单例实例在第一次使用时进行创建*/ public class SingletonExample1 { // 私有构造函数 JAVA 单例模式 java单例模式线程安全 单例模式 工厂方法 同步锁 转载 墨韵流香 2023-07-18 20:23:06 71阅读 ...
Example of Design Patterns in Java Now we will see java code examples of singleton design patterns. The singleton design pattern requires creating a singleton class that returns the same instance every time someone instantiates it. The below code example shows the creation and usage of a singleton...
importjava.util.concurrent.ArrayBlockingQueue;importjava.util.concurrent.BlockingQueue;publicclassProducerConsumerExample{publicstaticvoidmain(String[]args){// 创建一个容量为10的阻塞队列BlockingQueue<Integer>queue=newArrayBlockingQueue<>(10);// 创建一个生产者线程和一个消费者线程Thread producer=newThread(...
51、类ExampleA继承Exception,类ExampleB继承ExampleA。 有如下代码片断: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 try { throw new ExampleB("b") } catch(ExampleA e){ System.out.println("ExampleA"); } catch(Exception e){ System.out.println("Exception"); } 请问执行此段代码的输出是...