链式结构(案例)

public class Student {

    public Student(){

    }

    protected Builder builder(){
        return new Builder();
    }

    public class Builder{

        private String name;

        private String hoby;

        private int age;

        public String getName() {
            return name;
        }

        public Builder setName(String name) {
            this.name = name;
            return this;
        }

        public String getHoby() {
            return hoby;
        }

        public Builder setHoby(String hoby) {
            this.hoby = hoby;
            return this;
        }

        public int getAge() {
            return age;
        }

        public Builder setAge(int age) {
            this.age = age;
            return this;
        }

        @Override
        public String toString() {
            return "name:"+this.getName()+" age:"+this.getAge()+" hoby:"+this.getHoby();
        }
    }
}

public class LinkTest {

    public static void main(String[] args){
        Student student=new Student();
       System.out.println(student.builder().setAge(10).setHoby("play basketball").setName("austin").toString());
    }

}