java反射--4.调用有参构造方法创建实例对象

package set;

public class Person {
    
    

	private String name;
	private int age;

	// 创建构造方法,在new时就给属性传值
	public Person() {
    
    
	}

	public Person(String name, int age) {
    
    
		this.name = name;
		this.age = age;
	}

	@Override
	public String toString() {
    
    
		return this.name + "\t" + this.age;
	}

}

package test0812;

import java.lang.reflect.Constructor;

//使用java反射获取类的对象(调用有参构造方法创建实例对象)

public class Test04 {
    
    

	public void createObj(String className) {
    
    
		// 通过java反射获取B类的对象
		try {
    
    
			Class clazz = Class.forName(className);
			
			//获取有参构造方法(Constructor就是构造方法)
			Constructor cons = clazz.getConstructor(new Class[]{
    
    String.class,int.class});
			// 使用java反射获取类的对象
			Object obj = cons.newInstance(new Object[] {
    
    "张三",22});
			System.out.println(obj); //张三        22
		} catch (Exception e) {
    
    
			e.printStackTrace();
		}
	}

	public static void main(String[] args) {
    
    
		Test04 t = new Test04();
		t.createObj("test0812.Person");
	}
}