类别:
Creational pattern
问题:
构造函数入参超长易变
方案:
示例:
public class BuilderPatternDemo { public static void main(String[] args) { Car.Builder builder = new Car.Builder("Benz"); Car car = builder.build(); System.out.println(car); builder = new Car.Builder("Ford").type("Pickup").color("Red"); car = builder.build(); System.out.println(car); } } class Car { private String brand; private String type; private String color; public static class Builder { // 必填 private String brand; // 选填 private String type = "SUV"; private String color = "black"; public Builder(String brand) { this.brand = brand; } public Builder type(String type) { this.type = type; return this; } public Builder color(String color) { this.color = color; return this; } public Car build() { return new Car(this); } } /** * Builder 模式 不提供构造器 */ private Car(Car.Builder builder) { this.brand = builder.brand; this.type = builder.type; this.color = builder.color; } @Override public String toString() { return "Car [brand=" + brand + ", type=" + type + ", color=" + color + "]"; } }
应用:
不足:(
优化:)
标签:String,color,Pattern,Builder,Car,type,brand From: https://www.cnblogs.com/zno2/p/6694808.html