Shape.java

public final class Shape {

    public float perimeter;
    public float area;
    public int color;
    public String name;

    private Shape(ShapeBuilder builder) {
        perimeter = builder.perimeter;
        area = builder.area;
        color = builder.color;
        name = builder.name;
    }

    public static class ShapeBuilder implements ShapeBuilderInterface {

        public ShapeBuilder(float perimeter,float area){
            this.perimeter = perimeter;
            this.area = area;
        }
        private float perimeter;
        private float area;
        public int color = 0;
        public String name = "undefined";

        @Override
        public ShapeBuilder addColor(int color) {
            this.color = color;
            return this;
        }

        @Override
        public ShapeBuilder addName(String name) {
            this.name = name;
            return this;
        }

        public Shape build(){
            return new Shape(this);
        }
    }
}