builder小demo

Builder好處就是能夠一次選配好幾個選項

public class Student {

    private String name = "";

    private String age = "";

    private String sex = "";

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

    public String getAge() {
        return age;
    }

    public void setAge(String age) {
        this.age = age;
    }

    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }

    public Student() {

    }

    public Student(Builder builder) {
        name = builder.name;
        age = builder.age;
    }

    public static class Builder{
        private String name = "";
        private String age = "";

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

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

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

    };
}

若是不適用Builder，建立一個對象賦值，須要好幾回完成，

Student student = new Student();
student.setAge("9");
student.setName("ha");

使用Builder一次就能夠配置完成

Student student = new Student.Builder().setName("ha").setAge("9").create();

固然，建立構造函數也能夠進行多參數賦值，但是當參數不少時，構造參數就會很長很亂。

Builder優勢可在建立期間進行調整，還能夠根據對象不一樣而進行改變

Builder缺點是確定會增長代碼量的

具體詳細介紹http://www.importnew.com/6605.html