builder小demo

Builder好处就是能够一次选配好几个选项

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);
        }

    };
}

若是不适用Builder，建立一个对象赋值，须要好几回完成，

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

使用Builder一次就能够配置完成

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

固然，建立构造函数也能够进行多参数赋值，但是当参数不少时，构造参数就会很长很乱。

Builder优势可在建立期间进行调整，还能够根据对象不一样而进行改变

Builder缺点是确定会增长代码量的

具体详细介绍http://www.importnew.com/6605.html