Facade Pattern

package oodesign.design.structural.facade.subsystem;

class HelpSystem01 {

    public HelpSystem01(){
        System.out.println("call constructor: "+getClass().getSimpleName());
    }

    public void proc(){
        System.out.println("call proc: "+getClass().getSimpleName());
    }
}

class HelpSystem02 {

    public HelpSystem02(){
        System.out.println("call constructor: "+getClass().getSimpleName());
    }

    public void proc(){
        System.out.println("call proc: "+getClass().getSimpleName());
    }
}

class HelpSystem03 {

    public HelpSystem03(){
        System.out.println("call constructor: "+getClass().getSimpleName());
    }

    public void proc(){
        System.out.println("call proc: "+getClass().getSimpleName());
    }
}

package oodesign.design.structural.facade.subsystem;

public class Facade {

    private HelpSystem01 helpSystem01;
    private HelpSystem02 helpSystem02;
    private HelpSystem03 helpSystem03;

    public Facade(){
        helpSystem01 = new HelpSystem01();
        helpSystem02 = new HelpSystem02();
        helpSystem03 = new HelpSystem03();
    }

    public void proc(){
        helpSystem01.proc();
        helpSystem02.proc();
        helpSystem03.proc();
    }
}

package oodesign.design.structural.facade;

public class Main {

    public static void main(String[] args) {
        new Facade().proc();
    }
}