通過構造函數實例化對象

/**
 * Created by hunt on 2017/6/27.
 * 測試的實體類
 * @Data 編譯后會自動生成set、get、無慘構造、equals、canEqual、hashCode、toString方法
 */
@Data
public class Person {
    private String name;
    private int age;
    public Person(String name){
        this.name = name;
    }
    public Person(int age){
        this.age = age;
    }
    public Person(String name,int age){...}

}

import java.lang.reflect.Constructor;

/**
 * Created by hunt on 2017/6/27.
 */
public class NewInstanceTest {
    public static void main(String[] args) {
        Class<Person> personClass = Person.class;
        try {
            Constructor<?> constructor  = personClass.getConstructor(java.lang.String.class);
            Person p = (Person) constructor.newInstance("hunt");
            System.out.println(p);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

總結：通過class.getConstructor(parameterTypes)獲得對應的構造器，然后通過constructor.newInstance(parameterTypes)實例化對象。