抽象工厂模式
抽象工厂模式是在工厂模式的基础上增加的一层抽象概念。如果比较抽象工厂模式和工厂模式,我们不难发现前者只是增加了一层抽象的概念。抽象工厂是一个父类工厂,可以创建其它工厂类。故我们也叫它“工厂的工厂”。
抽象工厂类图
抽象工厂示例代码
interface CPU { void process(); } interface CPUFactory { CPU produceCPU(); } class AMDFactory implements CPUFactory { public CPU produceCPU() { return new AMDCPU(); } } class IntelFactory implements CPUFactory { public CPU produceCPU() { return new IntelCPU(); } } class AMDCPU implements CPU { public void process() { System.out.println("AMD is processing..."); } } class IntelCPU implements CPU { public void process() { System.out.println("Intel is processing..."); } } class Computer { CPU cpu; public Computer(CPUFactory factory) { cpu = factory.produceCPU(); cpu.process(); } } public class Client { public static void main(String[] args) { new Computer(createSpecificFactory()); } public static CPUFactory createSpecificFactory() { int sys = 0; // 基于特定要求 if (sys == 0) return new AMDFactory(); else return new IntelFactory(); } }