《有些模式》- Builder

?或许你已经看惯了javabean和层叠构造.

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/** * Builder模式 * @author Macrotea * */public class ManFacts {private String name;private int age;private double height;private double weight;public static class Builder {// 必须private String name;private int age;// 可选private double height;private double weight;public Builder(String name, int age) {super();this.name = name;this.age = age;}public Builder height(double height) {this.height = height;return this;}public Builder weight(double weight) {this.weight = weight;return this;}public ManFacts build() {return new ManFacts(this);}}private ManFacts(Builder builder) {this.age = builder.age;this.name = builder.name;this.height = builder.height;this.weight = builder.weight;}}public static void main(String[] args) {ManFacts manFacts=new ManFacts.Builder("macrotea", 22).height(180).weight(140).build();}