Java设计模式之外观模式详解

// 外观类
public class Facade {
    private SubsystemA subsystemA;
    private SubsystemB subsystemB;
    public Facade() {
        this.subsystemA = new SubsystemA();
        this.subsystemB = new SubsystemB();
    }
    public void operation() {
        subsystemA.operationA();
        subsystemB.operationB();
    }
}
// 子系统A
public class SubsystemA {
    public void operationA() {
        System.out.println("Subsystem A is doing its operation.");
    }
}
// 子系统B
public class SubsystemB {
    public void operationB() {
        System.out.println("Subsystem B is doing its operation.");
    }
}

// 项目外观类
public class ProjectFacade {
    private ModuleA moduleA;
    private ModuleB moduleB;
    public ProjectFacade() {
        this.moduleA = new ModuleA();
        this.moduleB = new ModuleB();
    }
    public void run() {
        moduleA.execute();
        moduleB.execute();
    }
}
// 子系统ModuleA
public class ModuleA {
    public void execute() {
        System.out.println("Module A is executing.");
    }
}
// 子系统ModuleB
public class ModuleB {
    public void execute() {
        System.out.println("Module B is executing.");
    }
}