构造器模式

/**
*当我们要创建的一个对象需要很多的属性的时候，不需要设置过多的构造函数，建造者模式将发挥作用
*/
class Builder{

    static class Student{
        String name="liurong";
        int age;
        String address="china";
        int score=90;

        static class StudentBuilder{
            String name="zhangsan";
            int age=23;
            String address;
            int score;

            public StudentBuilder setName(String name){
                this.name=name;
                return this;
            }
            public StudentBuilder setAge(int age){
                this.age=age;
                return this;
            }
            public StudentBuilder setAddress(String address){
                this.address=address;
                return this;
            }
            public StudentBuilder setScore(int score){
                this.score=score;
                return this;
            }

            public Student builder(){
                return new Student(this);
            }
        }

        public Student(StudentBuilder studentBuilder){
            this.address=studentBuilder.address;
            this.age=studentBuilder.age;
            this.score=studentBuilder.score;
            this.name=studentBuilder.name;
        }
    }

    public static void main(){
        Student student1=new Student.StudentBuilder().setAddress("xxx").setAge(200).setName("xxx").setScore(23).builder();
    }
}