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package com.reflectpro;

import org.junit.Test;

import java.lang.reflect.InvocationTargetException;

import java.lang.reflect.Method;

//使用反射中的Invoke方法执行Class对象的方法

public class InvokeDemo {

@Test

public void InvokeDemo() throws NoSuchMethodException, IllegalAccessException {

Class<TestMethod> testMethodClass = TestMethod.class;

//测试静态方法的执行

Method testStatic = testMethodClass.getMethod("testStatic", null);

try {

testStatic.invoke(null, null);

} catch (InvocationTargetException e) {

e.printStackTrace();

}

TestMethod testMethod = new TestMethod();

//测试有参方法的执行

Method add = testMethodClass.getDeclaredMethod("add", int.class, int.class);

add.setAccessible(true);

int result = 0;

try {

result = (int) add.invoke(testMethod, 1, 2);

} catch (InvocationTargetException e) {

e.printStackTrace();

}

System.out.println("add方法执行的结果result="+result);

//测试方法的包装错误

Method testException = testMethodClass.getMethod("testException", null);

try {

testException.invoke(testMethod, null);

} catch (InvocationTargetException e) {

System.out.println("该方法发生了一些错误，错误的类型是:"+e.getCause().getClass().getName());

System.out.println("错误的信息是："+e.getCause().getMessage());

}

}

}