Java通过反射技术动态创建对象(有参、无参构造)

 实现类：

package com.ljy;

import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;

/**
 * 
* @ClassName: ConstructorTest
* @Description: 通过反射技术动态创建对象(有参、无参构造)
* @author ljy
* @date 2019年9月12日 上午11:50:48
*
 */
public class ConstructorTest {
    public static void main(String[] args) {
        try {
            Class clazz = Class.forName("com.ljy.Teacher");

            // 获取到指定的构造方法
            Constructor constructor1 = clazz.getConstructor(new Class[]{Integer.class, String.class, String.class});
            // 通过获取到的构造方法创建对象
            Object obj1 = constructor1.newInstance(1,"lisi","男");
            System.out.println(obj1.toString());
            
            // 也可以获取无参构造方法，但是比前面一种难
            Object obj2 = clazz.getConstructor(new Class[]{}).newInstance(new Object[]{});
            obj2 = clazz.getConstructor().newInstance();
            System.out.println(obj2);
                
            
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (NoSuchMethodException e) {
            e.printStackTrace();
        } catch (SecurityException e) {
            e.printStackTrace();
        } catch (InstantiationException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (IllegalArgumentException e) {
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            e.printStackTrace();
        }
    }
}

 

 

Teacher类：

package com.ljy;

public class Teacher {
    private Integer id;
    private String name;
    private String sex;
    
    public Integer getId() {
        return id;
    }
    public void setId(Integer id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getSex() {
        return sex;
    }
    public void setSex(String sex) {
        this.sex = sex;
    }
    public Teacher(Integer id, String name, String sex) {
        super();
        this.id = id;
        this.name = name;
        this.sex = sex;
    }
    public Teacher(String name, String sex) {
        super();
        this.name = name;
        this.sex = sex;
    }
    public Teacher() {
    }
    @Override
    public String toString() {
        return "Teacher [id=" + id + ", name=" + name + ", sex=" + sex + "]";
    }
    
    
}