Java反射动态执行方法

Posted 2022-08-08 CodeLogs

方法类

public class Pub_Methods 
    private String myString = "测试字符串";
    
    public String getMyString() 
        return myString;
    

    public void setMyString(String myString) 
        this.myString = myString;
    

反射动态调用

import org.junit.Test;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

public class MyDemo 
    
    @Test
    public void test() throws NoSuchMethodException, InvocationTargetException, IllegalAccessException 
        Pub_Methods pubMethods = new Pub_Methods();
        Method method;

        //所有类方法对象
        Method[] methods = pubMethods.getClass().getMethods();
        for (Method m:methods)
            //只获取SET方法
            if (m.getName().startsWith("set"))
                System.out.print("方法名称："+m.getName()+"\\t");
                System.out.println("参数类型："+m.getParameterTypes()[0].getName());
            
        
        
        //无参调用
        method = pubMethods.getClass().getMethod("getMyString");
        String myStr = (String) method.invoke(pubMethods);
        System.out.println("无参调用返回结果："+myStr);
        
        //有参调用
        method = pubMethods.getClass().getMethod("setMyString", String.class);
        method.invoke(pubMethods,"新的参数值");
        System.out.println("有参调用返回结果："+pubMethods.getMyString());
        
       

输出结果：

方法名称：setMyString 参数类型：java.lang.String
方法名称：setMyList 参数类型：java.util.List
无参调用返回结果：测试字符串
有参调用返回结果：新的参数值