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The syntax for coding constructors

public ClassName([parameterList])
{
    // the statements of the  constructors 
}

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Example 1: A constructor that assigns default values

public Product()
{
     code = "";
     description = "";
     price = 0.0;
}

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Example 2: A custom constructor with three paramenters

public Product(String code, String description, double price)
{
     this.code = code;
     this.description = description;
     this.price = price;
}

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Example 3: Another way to code the constructor shown above

public Product(String c, String d, double p)
{
     code = c;
     description = d;
     price = p;
}

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Example 4: A constructor with one parameter

public Product(String code)
{
     this.code = code;
     Product p = ProductDB.getProduct(code);
     description = p.getDescription();
     price = p.getPrice();
}

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