通过构造函数实例化对象的方法

/**
 * Created by hunt on 2017/6/27.
 * 测试的实体类
 * @Data 编译后会自动生成set、get、无惨构造、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();
    }
  }
}