标签：class 没有 system uil 类的方法 文章 不能 stat str
还没有看过Builder模式的作用，看过一篇介绍Builder模式的文章，这里是关于Builder模式的思考：思考是否有比新建一个内部类更好的方法，首先想到的是
package xyz.n490808114.test; public class BuilderTest{ String name; int age; int high; int weight; int speed; public BuilderTest name(String name){ this.name = name; return this; } public BuilderTest age(int age){ this.age = age; return this; } public BuilderTest high(int high){ this.high = high; return this; } public BuilderTest weight(int weight){ this.weight = weight; return this; } public BuilderTest speed(int speed){ this.speed = speed; return this; } public void setName(String name){this.name = name;} public void setAge(int age){this.age = age;} public void setHigh(int high){this.high = high;} public void setWeight(int weight){this.weight = weight;} public void setSpeed(int speed){this.speed = speed;} public String getName(){return this.name;} public int getAge(){return this.age;} public int getHigh(){return this.high;} public int getWeight(){return this.weight;} public int getSpeed(){return this.speed;} public static void main(String[] args) { BuilderTest t = new BuilderTest().age(20).speed(50); System.out.println(t.name); System.out.println(t.age); System.out.println(t.high); System.out.println(t.weight); System.out.println(t.speed); } }
输出为
null
20
0
0
50
这样感觉跟set方法重复太多，整合一下，如下
package xyz.n490808114.test; public class BuilderTest{ String name; int age; int high; int weight; int speed; public BuilderTest setName(String name){this.name = name;return this;} public BuilderTest setAge(int age){this.age = age;return this;} public BuilderTest setHigh(int high){this.high = high;return this;} public BuilderTest setWeight(int weight){this.weight = weight;return this;} public BuilderTest setSpeed(int speed){this.speed = speed;return this;} public String getName(){return this.name;} public int getAge(){return this.age;} public int getHigh(){return this.high;} public int getWeight(){return this.weight;} public int getSpeed(){return this.speed;} public static void main(String[] args) { BuilderTest t = new BuilderTest().setAge(20).setSpeed(50); System.out.println(t.name); System.out.println(t.age); System.out.println(t.high); System.out.println(t.weight); System.out.println(t.speed); } }
这样只是精简代码，只是不知道这样的set方法能不能被spring认可，待测试
能够想到的是：
1，Builder模式用内部类的方法，可以用来修改现有代码，不改动，不新增类的方法，仅在创建时使用内部类；
2，猜测：如果不是频繁创建的话，对性能的影响不大；
3，如果不采用模式，仅使用set方法的话，代码量会多，但是代码会更清晰；
4，Builder模式使代码更易阅读。
标签：class 没有 system uil 类的方法 文章 不能 stat str
原文地址：https://www.cnblogs.com/xiangzhahao/p/11157397.html
