通过反射调用方法和操作属性

叁歲伎倆 2022-05-15 02:58 229阅读 0赞

Student类：

package com.java1234;
    
    public class Student {
    
    	private int id;
    	private int age;
    	private String name;
    	
    	
    	public Student() {
    		super();
    		// TODO Auto-generated constructor stub
    	}
    	
    	public Student(int id, int age, String name) {
    		super();
    		this.id = id;
    		this.age = age;
    		this.name = name;
    	}
    
    	
    	public Student(int age, String name) {
    		super();
    		this.age = age;
    		this.name = name;
    	}
    
    	public int getId() {
    		return id;
    	}
    	public void setId(int id) {
    		this.id = id;
    	}
    	public int getAge() {
    		return age;
    	}
    	public void setAge(int age) {
    		this.age = age;
    	}
    	public String getName() {
    		return name;
    	}
    	public void setName(String name) {
    		this.name = name;
    	}
    	
    	public void print() {
    		System.out.println("我的年龄是"+age);
    	}
    	@Override
    	public String toString() {
    		return "Student [id=" + id + ", age=" + age + ", name=" + name + "]";
    	}
    	
    }

通过反射，调用invoke方法来调用相应的方法：

测试类：

package com.java1234;
    
    import java.lang.reflect.Method;
    
    public class Test1 {
    
    	public static void main(String[] args) {
    		Class<?> c=null;
    	try {
    		c=Class.forName("com.java1234.Student");
    		System.out.println(c.getName());
    	} catch (ClassNotFoundException e) {
    		// TODO Auto-generated catch block
    		e.printStackTrace();
    	}
    	try {
    		Object obj=c.newInstance();
    		Method m1=obj.getClass().getMethod("setName",String.class);
    		m1.invoke(obj, "张飞");
    		Method m2=obj.getClass().getMethod("getName");
    		String name=(String)m2.invoke(obj);
    		System.out.println(name);
    	} catch (Exception e) {
    		e.printStackTrace();
    	}
    		}
    }

运行结果：

![70][]

[70]: /images/20220515/827aef11414a441f9288422796362295.png