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public abstract class Computer {
    protected String mBoard;
    protected String mDisplay;
    protected String mOs;

    protected Computer(){
    }

    public void setBoard(String board){
        mBoard=board;
    }

    public void setDisplay(String display) {
        this.mDisplay = display;
    }

    public abstract void setOs() ;

    @Override
    public String toString() {
        return "Computer{" +
                "mBoard='" + mBoard + '\'' +
                ", mDisplay='" + mDisplay + '\'' +
                ", mOs='" + mOs + '\'' +
                '}';
    }
}

public class MacBook extends Computer{

    protected MacBook() {
    }

    @Override
    public void setOs() {
        mOs="Mac OS X 12";
    }
}

public abstract class Builder {

    abstract void buildBoard(String board);
    abstract void buildDisplay(String display);
    abstract void buildOs();
    abstract Computer build();

}

public class MacBookBuilder extends Builder {

    private Computer mComputer=new MacBook();
    @Override
    void buildBoard(String board) {
        mComputer.setBoard(board);
    }

    @Override
    void buildDisplay(String display) {
        mComputer.setDisplay(display);
    }

    @Override
    void buildOs() {
        mComputer.setOs();
    }

    @Override
    Computer build() {
        return mComputer;
    }
}

public class Director {
    Builder mBuilser=null;

    public Director(Builder builer) {
        this.mBuilser = builer;
    }

    public void construct(String board,String display){
        mBuilser.buildDisplay(display);
        mBuilser.buildBoard(board);
        mBuilser.buildOs();
    }
}

public class Test {

    public static void main(String[] args){
        Builder builder=new MacBookBuilder();
        Director pcDirector=new Director(builder);
        pcDirector.construct("Intel motherboard","Retina display");

        Computer computer = builder.build();
        System.out.println(computer.toString());
    }

}