外观模式

package facade;

public class A {

    public void a(){
        System.out.println("A.a()");
    }
}

package facade;

public class B {

    public void b(){
        System.out.println("B.b()");
    }
}

package facade;

public class C {

    public void c(){
        System.out.println("C.c()");
    }
}

package facade;

public class Base {

    private A a;
    private B b;
    private C c;
    
    public Base(){
        a=new A();
        b=new B();
        c=new C();
    }
    
    public void f1(){
        a.a();
        b.b();
        c.c();
    }
    public static void main(String[] args) {
        Base base=new Base();
        base.f1();
    }
}