How to fix the "constructor hell" anti-pattern in Java?

Question

Consider this Java class "Product":
```
public class Product {
    private String name;
    private String description;
    private String category;
    private String brand;
    private double price;
    private int stock;
    private String color;
    private String size;
    private String material;
    private String manufacturer;

public Product(String name, String description, String category, String brand, double price, int stock, String color, String size, String material, String manufacturer) {
        this.name = name;
        this.description = description;
        this.category = category;
        this.brand = brand;
        this.price = price;
        this.stock = stock;
        this.color = color;
        this.size = size;
        this.material = material;
        this.manufacturer = manufacturer;
    }
}
```
Which of the following solutions, would be the most appropriate to fix this class anti-pattern?

Accepted Answer

```
public class Product {
    private String name;
    private String description;
    private String category;
    private String brand;
    private double price;
    private int stock;
    private String color;
    private String size;
    private String material;
    private String manufacturer;

private Product(ProductBuilder builder) {
        this.name = builder.name;
        this.description = builder.description;
        this.category = builder.category;
        this.brand = builder.brand;
        this.price = builder.price;
        this.stock = builder.stock;
        this.color = builder.color;
        this.size = builder.size;
        this.material = builder.material;
        this.manufacturer = builder.manufacturer;
    }

public static ProductBuilder builder() {
        return new ProductBuilder();
    }

public static class ProductBuilder {
        private String name;
        private String description;
        private String category;
        private String brand;
        private double price;
        private int stock;
        private String color;
        private String size;
        private String material;
        private String manufacturer;

public ProductBuilder name(String name) {
            this.name = name;
            return this;
        }

public ProductBuilder description(String description) {
            this.description = description;
            return this;
        }

public ProductBuilder category(String category) {
            this.category = category;
            return this;
        }

public ProductBuilder brand(String brand) {
            this.brand = brand;
            return this;
        }

public ProductBuilder price(double price) {
            this.price = price;
            return this;
        }

public ProductBuilder stock(int stock) {
            this.stock = stock;
            return this;
        }

public ProductBuilder color(String color) {
            this.color = color;
            return this;
        }

public ProductBuilder size(String size) {
            this.size = size;
            return this;
        }

public ProductBuilder material(String material) {
            this.material = material;
            return this;
        }

public ProductBuilder manufacturer(String manufacturer) {
            this.manufacturer = manufacturer;
            return this;
        }

public Product build() {
            return new Product(this);
        }
    }
}
```

Answer

``` 
public class Product {
    private String name;
    private String description;
    private String category;
    private String brand;
    private double price;
    private int stock;
    private String color;
    private String size;
    private String material;
    private String manufacturer;

public Product() {
        this.name = "";
        this.description = "";
        this.category = "";
        this.brand = "";
        this.price = 0.0;
        this.stock = 0;
        this.color = "";
        this.size = "";
        this.material = "";
        this.manufacturer = "";
    }
}
```

Answer

All the above answers.

Answer

```
public class Product {
    private String name;
    private String description;
    private String category;
    private String brand;
    private double price;
    private int stock;
    private String color;
    private String size;
    private String material;
    private String manufacturer;

public Product() {
    }

public void setName(String name) {
        this.name = name;
    }

public void setDescription(String description) {
        this.description = description;
    }

public void setCategory(String category) {
        this.category = category;
    }

public void setBrand(String brand) {
        this.brand = brand;
    }

public void setPrice(double price) {
        this.price = price;
    }

public void setStock(int stock) {
        this.stock = stock;
    }

public void setColor(String color) {
        this.color = color;
    }

public void setSize(String size) {
        this.size = size;
    }

public void setMaterial(String material) {
        this.material = material;
    }

public void setManufacturer(String manufacturer) {
        this.manufacturer = manufacturer;
    }
}
```

Question from the Patterns & Anti-patterns test

How to fix the "constructor hell" anti-pattern in Java?