import android.text.TextUtils;/*** Created by toothwind on 2017/7/19.* you can contact me at : toothwind@163.com.* All Rights Reserved*/ public class Demo {//屬性private String age;private String height;private String salary;//構造private Demo(Builder builder) {this.age = builder.age;this.height = builder.height;this.salary = builder.salary;}//對外方法public String age() {return age;}//對外方法public String height() {return height;}//對外方法public String salary() {return salary;}public Builder newBuilder() {return new Builder(this);}@Overridepublic String toString() {return "Demo{" +"age='" + age + '\'' +", height='" + height + '\'' +", salary='" + salary + '\'' +'}';}public static class Builder {private String age;private String height;private String salary;public Builder() {this.age = "18";}private Builder(Demo demo) {this.age = demo.age;this.height = demo.height;this.salary = demo.salary;}public Builder age(String age) throws Exception {if (TextUtils.isEmpty(age)) {throw new Exception("年齡不能為空");}this.age = age;return this;}public Builder height(String height) throws Exception {if (TextUtils.isEmpty(height)) {throw new Exception("身高不能為空");}this.height = height;return this;}public Builder salary(String salary) throws Exception {this.salary = salary;return this;}public Demo build() {return new Demo(this);}}}

　　

轉載于:https://www.cnblogs.com/yaya25001/p/7205765.html

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