版权声明:本文为博主原创文章,转载请注明出处 https://blog.csdn.net/qq_23934475/article/details/82911557
Builder 建造者模式
本系列为 https://github.com/iluwatar/java-design-patterns 阅读笔记
之前读《java effective》时了解到Builder模式
至于为什么出现Builder模式参见 https://blog.csdn.net/lms1719/article/details/70741691
这个模式看似简单还是需要写一遍才行,
我敲了一遍中间出了很多错
Builder 声明public static class Builder
public class Hero {
private final String name;
private final String gen;
private final LocalDate birthday;
public Hero(Builder builder) {//
this.name = builder.name;
this.gen = builder.gen;
this.birthday = builder.birthday;
}
public static class Builder {
private final String name;
private String gen;
private LocalDate birthday;
public Builder(String name) {//必填参数
this.name = name;
}
public Builder setGen(String gen){
this.gen = gen;
return this;//返回自身,链式创建
}
public Builder setBirthDay(LocalDate day){
this.birthday = day;
return this;
}
public Hero build(){//构造完成之后调用外部类构造函数
return new Hero(this);
}
}
public static void main(String[] args) {
Hero build = new Builder("tom").setBirthDay(LocalDate.now()).build();
System.out.println(build);
}
}