public class Car {
public static class Builder {
private int year;
private String make;
private String model;
private String color;
public Builder year(int year) { this.year = year; return this; }
public Builder make(String make) { this.make = make; return this; }
public Builder model(String model) { this.model = model; return this; }
public Builder color(String color) { this.color = color; return this; }
public Car build() {
return new Car(year, make, model, color);
}
}
private final int year;
private final String make;
private final String model;
private final String color;
private Car(int year, String make, String model, String color) {
this.year = year;
this.make = make;
this.model = model;
this.color = color;
}
public static Builder builder() {
return new Builder();
}
}
// Using this fluent API...
Car car = Car.builder()
.year(2007)
.make("Toyota")
.model("Camry")
.color("blue")
.build();
Refactorings
No refactoring yet !
askalon
January 23, 2008, January 23, 2008 21:02, permalink
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A little bit shorter version.
public class Car {
public static class Builder {
private final Car car = new Car();
public Builder year(int year) { car.year = year; return this; }
public Builder make(String make) { car.make = make; return this; }
public Builder model(String model) { car.model = model; return this; }
public Builder color(String color) { car.color = color; return this; }
public Car build() { return car; }
}
private int year;
private String make;
private String model;
private String color;
private Car() { }
public static Builder builder() {
return new Builder();
}
}
Here's an example of the Builder pattern using a fluent interface, what I like to call a fluent builder (discussed at http://jeronrails.blogspot.com/2007/12/fluent-builders.html). There's some duplication and I think there's potential for refactoring. Give it a go!